CMS ENERGY CORP
424B5, 1999-01-22
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>   1
=============================================================================== 

PROSPECTUS SUPPLEMENT                                   Pursuant to Rule 424b-5
JANUARY 20, 1999                                      Registration No. 333-68933
(TO PROSPECTUS DATED JANUARY 19, 1999)
 
                               [CMS ENERGY LOGO]
 
                                  $480,000,000
 
                           7.5% SENIOR NOTES DUE 2009
- --------------------------------------------------------------------------------
 
THE COMPANY:
 
- - We are a leading diversified energy company operating in the United States and
  around the world.
 
- - CMS Energy Corporation
  Fairlane Plaza South, Suite 1100
  330 Town Center Drive
  Dearborn, Michigan 48126
  (313) 436-9200
 
THE OFFERING:
 
- - We intend to use the net proceeds from the offering to repay debt outstanding
  under our existing revolving credit facility.
 
- - Closing: January 25, 1999.
THE NOTES:
 
- - Maturity: January 15, 2009.
 
- - Interest Payments: Semi-annually in cash in arrears on January 15 and July 15,
  commencing on July 15, 1999.
 
- - Redemption: We can redeem some or all of the Notes at our option on at least
  30 days' notice.
 
- - Mandatory Offer to Repurchase: If we experience certain types of change in
  control, holders of Notes can require us to repurchase some or all of the
  Notes they hold.
 
- - Ranking of Notes: The Notes rank equally with all of our other unsecured and
  unsubordinated indebtedness.
 
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------
                                                    PER NOTE                TOTAL
- -----------------------------------------------------------------------------------------------------------
<S>                                                 <C>                  <C>                    
Public offering price:                              100.000%             $480,000,000
Underwriting fees:                                    1.625%             $  7,800,000
Proceeds to Company:                                 98.375%             $472,200,000
</TABLE>
 
- --------------------------------------------------------------------------------
    THIS INVESTMENT INVOLVES RISK. SEE "RISK FACTORS" BEGINNING ON PAGE S-9.
- --------------------------------------------------------------------------------
Neither the SEC nor any state securities commission has determined whether this
prospectus is truthful or complete. Nor have they made, nor will they make, any
determination as to whether anyone should buy these securities. Any
representation to the contrary is a criminal offense.
- --------------------------------------------------------------------------------
 
DONALDSON, LUFKIN & JENRETTE
          BARCLAYS CAPITAL
                     CHASE SECURITIES INC.
                               NATIONSBANC MONTGOMERY SECURITIES LLC
<PAGE>   2
 
                               TABLE OF CONTENTS
 
       PROSPECTUS SUPPLEMENT                             
 
                                    PAGE
Forward-Looking Statements........     i
Prospectus Supplement Summary.....   S-1
Risk Factors......................   S-9
Ratio of Earnings to Fixed
  Charges.........................  S-12
Use of Proceeds...................  S-12
Capitalization....................  S-13
The Company.......................  S-14
Description of the Notes..........  S-17
Underwriting......................  S-35
Legal Opinions....................  S-36
Experts...........................  S-36
Unaudited Pro Forma Financial
  Information.....................   F-1


           PROSPECTUS
 
                                    PAGE
Available Information.............     2
Incorporation of Certain Documents
  by Reference....................     3
CMS Energy Corporation............     3
Use of Proceeds...................     5
Ratio of Earnings to Fixed
  Charges.........................     5
Description of Debt Securities....     6
Legal Opinions....................    19
Experts...........................    19
Plan of Distribution..............    20

 
                           FORWARD-LOOKING STATEMENTS
 
     This prospectus supplement and the accompanying base prospectus contain or
incorporate by reference forward-looking statements. The factors identified
under "Risk Factors" are important factors (but not necessarily all important
factors) that could cause actual results to differ materially from those
expressed in any forward-looking statement made by, or on behalf of, the Company
(or its subsidiaries).
 
     Where any such forward-looking statements include a statement of the
assumptions or bases underlying such forward-looking statement, the Company
cautions that, while such assumptions or bases are believed to be reasonable and
are made in good faith, assumed facts or bases almost always vary from actual
results, and the differences between assumed facts or bases and actual results
can be material, depending upon the circumstances. Where, in any forward-looking
statement, the Company (or its subsidiaries), or its management, express an
expectation or belief as to future results, such expectation or belief is
expressed in good faith and is believed to have a reasonable basis, but there
can be no assurance that the statement of expectation or belief will result or
be achieved or accomplished. The words "believe", "expect", "estimate",
"project" and "anticipate" and similar expressions identify forward-looking
statements.
 
                                        i
<PAGE>   3
 
                         PROSPECTUS SUPPLEMENT SUMMARY
 
     This summary may not contain all the information that may be important to
you. You should read the entire prospectus supplement and the accompanying base
prospectus, including the financial data and related notes, before making an
investment decision. The terms "CMS", "CMS ENERGY", "COMPANY", "OUR" and "WE" as
used in this prospectus supplement and the accompanying base prospectus refer to
CMS Energy Corporation and its subsidiaries.
 
                                  THE COMPANY
 
     We are a leading diversified energy company operating in the United States
and around the world. Our two principal subsidiaries are Consumers Energy
Company ("CONSUMERS") and CMS Enterprises Company ("ENTERPRISES"). Consumers is
a public utility that provides natural gas and electricity to almost six million
of the nine and one-half million residents in Michigan's Lower Peninsula.
Enterprises, through subsidiaries, is engaged in several domestic and
international energy businesses including:
 
          - Transmission, storage and processing of natural gas;
 
          - Independent power production;
 
          - Oil and gas exploration and production;
 
          - International energy distribution; and
 
          - Energy marketing, services and trading.
 
     Our consolidated operating revenue in 1997 was $4.8 billion. 53% of our
consolidated operating revenue was derived from electric utility operations, 25%
from gas utility operations, 14% from energy marketing, services and trading
operations, 4% from independent power production and other non-utility
operations, 2% from transmission, storage and processing of natural gas, and 2%
from oil and gas exploration and production operations.
 
     Consumers' consolidated operations account for a majority of our total
assets, revenues and income. Consumers' service areas include automotive, metal,
chemical, food and wood products and a diversified group of other industries. At
year end 1997, Consumers provided service to 1.6 million electric customers and
1.5 million gas customers. Consumers' consolidated operating revenue in 1997 was
$3.8 billion. 67% of Consumers' operating revenue was generated from its
electric utility business, 32% from its gas utility business, and 1% from its
non-utility business.
 
     We routinely evaluate, invest in, acquire and divest energy-related assets
and/or businesses both domestically and internationally. Cash or securities are
routinely the consideration for such transactions.
 
                               BUSINESS STRATEGY
 
     We seek to be a leader in the North American and worldwide energy industry,
focusing our growth primarily in three energy sectors: electricity, natural gas
and diversified energy. After giving effect to the pending acquisition of the
Panhandle Companies described below, we will have approximately one-third of our
assets in each of these three energy sectors. Our Consumers subsidiary is a
leading producer and distributor of electricity and natural gas in Michigan's
Lower Peninsula. Our pending acquisition of the


                                       S-1
<PAGE>   4
 
Panhandle Companies will significantly enhance our natural gas assets. Through
our Enterprises subsidiary, we intend to become a leading diversified energy
company with operations in virtually all segments of the North American and
worldwide energy industry. In pursuing these business objectives, we intend to:
(i) generate stable earnings and cash flow from our regulated businesses through
maximization of retail electricity and natural gas services and natural gas
transportation revenues, as well as active cost management; (ii) invest in
energy-related projects which complement and expand our non-regulated and
diversified energy businesses, as well as in selected projects in regulated
businesses which management believes are capable of generating favorable
risk-adjusted returns; and (iii) pursue new areas for energy-related business
expansion, including strategic acquisitions and joint ventures. We expect to
continue to capitalize on emerging trends in the energy industry, including the
growing worldwide demand for energy infrastructure and the privatization of
existing governmental energy assets, as well as the deregulation of the natural
gas and electricity industries in the United States.
 
     We believe that our recent agreement to acquire Panhandle Eastern Pipe Line
Company ("PANHANDLE") and its principal subsidiaries, Trunkline Gas Company
("TRUNKLINE") and Pan Gas Storage Company, as well as its affiliates, Panhandle
Storage Company and Trunkline LNG Company ("TRUNKLINE LNG" and, collectively,
the "PANHANDLE COMPANIES"), as further described below will enhance our ability
to achieve our business objectives. See "-- Recent Developments". In fact, we
have already begun to implement our business strategy to capitalize on the
ultimate ownership of the Panhandle Companies by: (i) announcing our intention
to participate in the construction, ownership and operation of a 550 megawatt
natural gas-fired cogeneration facility in Dearborn, Michigan which will require
approximately 100 million cubic feet of natural gas per day which we will seek
to transport using the Panhandle Companies; and (ii) integrating the operations
of the Panhandle Companies with those of our existing and in-development natural
gas transmission and storage operations. This integration includes connecting
our natural gas gathering systems in the mid-continent region to our Midwestern
markets and the pending development of the TriState Pipeline running from a
natural gas transportation hub outside Chicago through a combination of new and
existing pipelines to ultimately connect to a natural gas transportation hub in
southwest Ontario.
 
                              RECENT DEVELOPMENTS
 
ACQUISITION OF THE PANHANDLE COMPANIES
 
     On November 2, 1998, we announced a definitive agreement to acquire all of
the outstanding common stock of the Panhandle Companies from Duke Energy
Corporation. Under the terms of the agreement, we will pay $1.9 billion in cash
to Duke Energy Corporation and assume $300 million of existing Panhandle debt.
We are currently awaiting approval for this transaction from the Federal Trade
Commission and expect to consummate this transaction during the first quarter of
1999.
 
     The Panhandle Companies are primarily engaged in the interstate
transmission and storage of natural gas. The Panhandle Companies operate one of
the nation's largest natural gas pipeline networks, providing customers in the
Midwest and Southwest with a comprehensive array of transportation services.
This interconnected 11,500 mile system accesses virtually all major natural gas
regions in the United States.


                                       S-2
<PAGE>   5
 
     Panhandle's transmission system consists of four large-diameter parallel
pipelines and extends approximately 1,300 miles from producing areas in the
Anadarko Basin of Texas, Oklahoma and Kansas through the states of Missouri,
Illinois, Indiana and Ohio into Michigan. Panhandle's system connects with the
Trunkline system at Tuscola, Illinois.
 
     Trunkline's transmission system consists principally of three
large-diameter parallel pipelines extending approximately 1,400 miles from the
Gulf Coast areas of Texas and Louisiana through the states of Arkansas,
Mississippi, Tennessee, Kentucky, Illinois and Indiana to a point on the
Indiana-Michigan border. Trunkline also owns and operates two offshore Louisiana
natural gas supply systems consisting of 337 miles of pipeline extending
approximately 81 miles into the Gulf of Mexico.
 
     Panhandle's major customers include approximately 20 utilities located in
the Midwest market area that encompasses large portions of Michigan, Ohio,
Indiana, Illinois and Missouri. Trunkline's major customers include six
utilities located in portions of Illinois, Indiana, Michigan, Ohio and
Tennessee. Transportation service for Consumers accounted for approximately 10%
of the combined revenue of the Panhandle Companies.
 
     The Panhandle Companies own and operate five underground gas storage fields
located in Illinois, Michigan, Kansas, Oklahoma and Louisiana with a combined
maximum working storage gas capacity of 70 billion cubic feet.
 
     Trunkline LNG owns a liquified natural gas ("LNG") regasification plant and
related LNG tanker port, unloading facilities and LNG and gas storage facilities
located at Lake Charles, Louisiana. The LNG plant has the capacity to deliver
700 million cubic feet per day but has been operated on a limited basis for a
number of years.
 
     The rates and operations of the Panhandle Companies are subject to
regulation by the Federal Energy Regulatory Commission.
 
     We currently have $1.9 billion in committed bridge financing, some or all
of which will be used to fund the cash portion of the purchase price for the
acquisition of the Panhandle Companies. Our long-term financing for the
acquisition of the Panhandle Companies will include a combination of Panhandle
debt, CMS debt and CMS equity.
 
     Please refer to our Forms 8-K, dated November 3 and December 30, 1998 and
January 20, 1999, for further information concerning this transaction.
 
     We were incorporated in Michigan in 1987 and our world wide web address is
http://www.cmsenergy.com. Our web site is not part of this prospectus
supplement. Our telephone number is (313) 436-9200.


                                       S-3


<PAGE>   6
 
PRELIMINARY RESULTS OF OPERATIONS FOR THE YEAR ENDED DECEMBER 31, 1998.
 
     The following information summarizes our unaudited preliminary results of
operation for the year ended December 31, 1998 as well as the comparable prior
year amounts. Our audited financial statements for the year ended December 31,
1998 have not yet been issued and are not currently available. Certain of our
prior year information presented has been restated as a result of a 1998 change
in accounting for investments in oil and gas properties.
 
<TABLE>
<CAPTION>
                                                                   YEAR ENDED
                                                                  DECEMBER 31,
                                                            -------------------------
                                                                1998           1997
                                                            ------------      -------
                                                            (UNAUDITED)
                                                            (IN MILLIONS, EXCEPT PER
                                                                 SHARE AMOUNTS)
<S>                                                         <C>               <C>
Operating revenue.........................................     $5,141         $4,781
Operating expenses........................................      4,366          4,065
Pretax operating income...................................        775            716
Income taxes..............................................        100            108
Consolidated net income before cumulative effect of change
  in accounting principle.................................        242            244
Cumulative effect of change in accounting for property
  taxes, net of tax(1)....................................         43             --
Consolidated net income...................................        285            244
Net income attributable to common stocks(1)
  CMS Energy..............................................     $  272         $  229
  Class G.................................................         13             15
Average common shares outstanding
  CMS Energy..............................................        102             96
  Class G.................................................          8              8
Earnings per average common share(1)
  CMS Energy Common Stock
     Basic................................................     $ 2.65         $ 2.39
     Diluted..............................................       2.62           2.37
  CMS G Common Stock Basic and Diluted....................       1.56           1.84
Dividends declared per common share
  CMS Energy..............................................       1.26           1.14
  Class G.................................................       1.27           1.21
</TABLE>
 
- -------------------------
     (1) In 1998, Consumers implemented a change in the method of accounting for
         property taxes which had the cumulative effect of increasing other
         income by $66 million, including $18 million attributable to the
         portion of business relating to Class G common stock. Our earnings, net
         of tax, increased by $43 million, or $0.40 per share for CMS Energy
         common stock and $0.36 per share for Class G common stock.
 
     Our 1998 net income was $285 million or $2.65 per share. Consolidated net
income and earnings per share increased $41 million and $0.26 from 1997, up 17%
and 11%, respectively. The results reflect substantial improvements in our
utility and diversified energy businesses and were achieved despite the warmest
weather in Michigan since 1921 and the lowest oil prices in the last 13 years.

                                       S-4
<PAGE>   7
 
                                  THE OFFERING
 
Issuer.......................  CMS Energy Corporation.
 
Securities Offered...........  $480 million principal amount of 7.5% Senior
                               Notes Due 2009 (the "Notes").
 
Maturity.....................  January 15, 2009.
 
Interest Rate................  The Notes will bear interest at the rate of 7.5%
                               per annum, payable semiannually on January 15 and
                               July 15 of each year, commencing July 15, 1999.
 
Optional Redemption..........  The Notes will be redeemable at our option, in
                               whole or in part, at any time or from time to
                               time, on not less than 30 days' notice, at the
                               redemption prices determined as described herein,
                               plus any accrued interest to the date fixed for
                               redemption.
 
Change in Control............  If a change in control were to occur, each holder
                               of Notes would be able to require us to
                               repurchase such Notes, in whole or in part, at a
                               price equal to 101% of the principal amount of
                               those Notes, plus any accrued and unpaid
                               interest.
 
Ranking......................  The Notes will be unsecured debt securities of
                               the Company. As of September 30, 1998, we had
                               outstanding approximately $2.321 billion
                               aggregate principal amount of indebtedness, none
                               of which was secured. None of such indebtedness
                               would be senior to the Notes and the Notes will
                               not be senior to such indebtedness. The Notes
                               will be senior to certain subordinated debentures
                               in aggregate principal amount of $178 million
                               issued in connection with certain preferred
                               securities of a subsidiary trust. The Notes will
                               rank equally in right of payment with all other
                               unsecured and unsubordinated indebtedness of the
                               Company.
 
Certain Covenants............  The Indenture governing the Notes will contain
                               covenants that will, among other things, limit
                               our ability to pay dividends or distributions,
                               incur additional indebtedness, incur additional
                               liens, sell, transfer or dispose of certain
                               assets, enter into certain transactions with
                               affiliates or enter into certain mergers or
                               consolidations.
 
Use of Proceeds..............  We intend to use the estimated net proceeds of
                               $472.2 million to repay debt outstanding under
                               our existing revolving credit facility.

                                       S-5
<PAGE>   8
 
                SELECTED HISTORICAL AND PRO FORMA FINANCIAL DATA
 
     The following selected historical and pro forma financial data for the
years ended December 31, 1995 through 1997 has been derived from our audited
consolidated financial statements. The selected historical and pro forma
financial data for the nine months ended September 30, 1997 and 1998 has been
derived from our unaudited consolidated financial statements and includes all
adjustments (consisting only of normal recurring adjustments) necessary for a
fair presentation of this information. The results of operations for these
interim periods presented are not necessarily indicative of the results that may
be expected for the full year. Certain historical selected financial information
presented herein has been restated as a result of a 1998 change in accounting
for investments in oil and gas properties. Please refer to our Form 8-K dated
July 30, 1998 incorporated by reference in the accompanying base prospectus.
Other data presented herein, which was not previously restated to reflect the
change in accounting method described in the Form 8-K, has also been restated.
The financial information set forth below should be read in conjunction with the
consolidated financial statements, related notes and other financial information
incorporated by reference in the accompanying base prospectus. See "Available
Information" and "Incorporation of Certain Documents by Reference" in the
accompanying base prospectus.
 
     The unaudited pro forma selected financial information illustrates the
effects of (i) various restructuring, realignment, and elimination of activities
between the Panhandle Companies and Duke Energy Corporation prior to the closing
of the pending acquisition of the Panhandle Companies by CMS Energy (the
"ACQUISITION"); (ii) the adjustments resulting from the Acquisition; and (iii)
certain assumed Panhandle and CMS Energy financing transactions which will be
completed to facilitate the Acquisition, including the assumed public issuance
of $800 million of senior notes by Panhandle, $500 million of senior debt by CMS
Energy and 13 million shares of common stock by CMS Energy aggregating
approximately $600 million.
 
<TABLE>
<CAPTION>
                                                                              NINE MONTHS ENDED
                                    YEAR ENDED DECEMBER 31,                     SEPTEMBER 30,
                             --------------------------------------   ----------------------------------
                                                         PRO FORMA                            PRO FORMA
                              1995     1996     1997       1997        1997       1998          1998
                              ----     ----     ----     ---------     ----       ----        ---------
                                                        (UNAUDITED)            (UNAUDITED)
                                               (IN MILLIONS, EXCEPT PER SHARE AMOUNTS)
<S>                          <C>      <C>      <C>      <C>           <C>      <C>           <C>
INCOME STATEMENT DATA:
  Operating revenue........  $3,890   $4,324   $4,781     $5,236      $3,347     $3,792        $4,102
  Operating expense........   3,282    3,648    4,065      4,329       2,807      3,185         3,373
  Pre-tax operating
    income.................     608      676      716        907         540        607           729
  Income taxes.............     113      137      108        138          99         86           105
  Consolidated net income
    before cumulative
    effect of change in
    accounting principle...  $  195   $  224   $  244     $  292      $  185     $  191        $  217
  Cumulative effect of
    change in accounting
    for property taxes, net
    of tax(1)..............      --       --       --         --          --         43            43
  Consolidated net
    income.................     195      224      244        292         185        234           260
  Net income attributable
    to common stocks(1)
    CMS Energy.............  $  192   $  210   $  229     $  277      $  176     $  226        $  252
    Class G................       3       14       15         15           9          8             8
</TABLE>
 
                                       S-6
<PAGE>   9
 
<TABLE>
<CAPTION>
                                                                              NINE MONTHS ENDED
                                    YEAR ENDED DECEMBER 31,                     SEPTEMBER 30,
                             --------------------------------------   ----------------------------------
                                                         PRO FORMA                            PRO FORMA
                              1995     1996     1997       1997        1997       1998          1998
                              ----     ----     ----     ---------     ----       ----        ---------
                                                        (UNAUDITED)            (UNAUDITED)
                                               (IN MILLIONS, EXCEPT PER SHARE AMOUNTS)
<S>                          <C>      <C>      <C>      <C>           <C>      <C>           <C>
  Average common shares
    outstanding
  CMS Energy...............      89       92       96        109          95        101           114
  Class G..................       8        8        8          8           8          8             8
  Earnings per average
    common share(1)
    CMS Energy Common Stock
       Basic...............  $ 2.16   $ 2.27   $ 2.39     $ 2.55      $ 1.85     $ 2.23        $ 2.21
       Diluted.............    2.16     2.26     2.37       2.54        1.83       2.19          2.18
    CMS G Common Stock
       Basic and Diluted...    0.38     1.82     1.84       1.84        1.13       1.04          1.04
  Dividends declared per
    common share
    CMS Energy.............    0.90     1.02     1.14       1.14        0.84       0.93          0.93
    Class G................    0.56     1.15     1.21       1.21        0.90       0.95          0.95
</TABLE>
 
<TABLE>
<CAPTION>
                                                                       AS OF SEPTEMBER 30,
                                           AS OF DECEMBER 31,      ---------------------------
                                        ------------------------                     PRO FORMA
                                         1995     1996     1997     1997     1998      1998
                                         ----     ----     ----     ----     ----    ---------
                                                        (DOLLARS IN MILLIONS)
<S>                                     <C>      <C>      <C>      <C>      <C>      <C>
BALANCE SHEET DATA:
  Cash and cash equivalents...........  $   56   $   58   $   69   $  136   $  101    $   101
  Net plant and property..............   4,814    5,029    5,144    5,130    5,270      6,818
  Total assets........................   7,909    8,363    9,508    9,221    9,930     12,367
  Long-term debt, excluding current
    maturities........................   2,906    2,842    3,272    3,060    4,248      5,847
  Non-current portion of capital
    leases............................     106      103       75       82       77         77
  Notes payable.......................     341      333      382      394      302        302
  Other liabilities...................   2,881    3,093    3,361    3,405    2,750      2,988
  Company-obligated mandatorily
    redeemable trust preferred
    securities of Consumers Power
    Company Financing I(2)............      --      100      100      100      100        100
  Company-obligated mandatorily
    redeemable trust preferred
    securities of Consumers Energy
    Company Financing II(2)...........      --       --      120      120      120        120
  Preferred stock of subsidiary.......     356      356      238      238      238        238
  Company-obligated convertible trust
    preferred securities of CMS Energy
    Trust I(3)........................      --       --      173      173      173        173
  Common stockholders' equity.........  $1,319   $1,536   $1,787   $1,649   $1,922    $ 2,522
</TABLE>
 
- -------------------------
 
     (1) During the first quarter of 1998, Consumers implemented a change in the
         method of accounting for property taxes which had the cumulative effect
         of increasing other income by $66 million, including $18 million
         attributable to the portion of business relating to Class G common
         stock. Earnings, net of tax, increased by $43 million or $0.40 per
         share for CMS Energy common stock and $0.36 per share for Class G
         common stock.
                                       S-7
<PAGE>   10
 
     (2) The primary asset of Consumers Power Company Financing I is $103
         million principal amount of 8.36% subordinated deferrable interest
         notes due 2015 from Consumers. The primary asset of Consumers Energy
         Company Financing II is $124 million principal amount of 8.20%
         subordinated deferrable interest notes due 2027 from Consumers.
 
     (3) The primary asset of CMS Energy Trust I is $178 million principal
         amount of 7.75% convertible subordinated debentures due 2027 from CMS
         Energy.

                                       S-8
<PAGE>   11
 
                                  RISK FACTORS
 
     In addition to the information set forth in this prospectus supplement and
the base prospectus, you should carefully consider the risks described below
before making an investment in the Notes. The risks described below are not the
only ones facing us. Additional risks not presently known to us or that we
currently deem immaterial may also impair our business operations.
 
LEVERAGE, DEBT SERVICE AND ABILITY TO PAY DIVIDENDS
 
     We, as a parent holding company, have substantial leverage and significant
debt service obligations which must be serviced by dividends or other
distributions and cash transfers from our subsidiaries or jointly owned
enterprises. As of September 30, 1998, we had outstanding $2.321 billion of
unsecured senior debt which will be ranked on an equal basis with the Notes and
our other liabilities and obligations to trade and other creditors. On a
consolidated basis, we and our subsidiaries had outstanding $5.398 billion of
long-term indebtedness and mandatorily redeemable trust preferred securities. On
a consolidated basis our debt was 67% of total capitalization as of September
30, 1998. As a result of restrictions contained in Consumers' mortgage bond
indenture and preferred stock provisions, and other legal restrictions,
Consumers' ability to pay dividends or acquire its own stock from us is limited.
Based upon the most restrictive provision, as of September 30, 1998, Consumers
would be able to pay an aggregate of $68.2 million in dividends to us. In the
three years and nine months ended September 30, 1998, Consumers paid out $661
million or 58% of its earnings in cash dividends to us. Enterprises is also
limited in the amount of dividends it is able to pay since it is expanding its
developing businesses at a rapid rate and also has restrictions on its ability
to pay dividends or acquire its own stock. Adverse financial or other economic
circumstances affecting our subsidiaries may adversely affect our ability to
meet our obligations to make payments on the Notes.
 
     Our high debt leverage and the subordinated position of the Notes just
described, as well as restrictions on the issuance of additional debt in our
financing agreements, could limit our ability to obtain additional capital for
future operating requirements and capital expenditures. Our ability to take full
advantage of opportunities and to adjust to rapidly changing conditions in the
markets we now serve or plan to enter and to react to possible adverse national
and international financial markets also could be adversely affected. In turn,
these factors could adversely affect our ability to make payments on the Notes.
 
STRUCTURAL SUBORDINATION
 
     Due to our holding company structure and the restrictions on dividend and
other types of payments by our subsidiaries to us as the parent company, the
Notes are effectively subordinated to the payment of interest, principal and
preferred distributions on the debt, preferred securities and other liabilities
of Consumers and Enterprises and each of their subsidiaries. None of these
entities will be obligated to pay amounts due on the Notes.
 
COMPETITION AND REGULATORY RESTRUCTURING
 
     Federal and state regulation of electric and gas utilities, interstate
pipelines and the independent electric power generation of electricity has
changed dramatically in the last two decades and could continue to change over
the next several years. As a result of these changes, gas distribution companies
like Consumers deliver to the natural gas which is sold
 
                                       S-9
<PAGE>   12
 
directly to customers by gas producers, marketers and others, some of whom are
our competitors for these sales. While Consumers' current rates allow it to
charge gas delivery rates which enable Consumers to maintain its margins in
retail gas service, the full impact of competition remains to be seen,
particularly if and when Consumers' existing program providing other gas
suppliers direct access to its customers is extended to all of Consumers' gas
customers. Our unregulated gas marketing subsidiary is an experienced and
successful competitor in this new market environment, but rapidly changing
competitive conditions could adversely affect its margins and market share and
add volatility to its financial results. Further changes in federal and state
regulation of the gas industry could also adversely affect Consumers' gas
utility business and our non-utility gas marketing business.
 
     Federal Energy Regulatory Commission ("FERC") policy allows the issuance of
certificates authorizing the construction of new interstate pipelines which are
competitive with existing pipelines. This has increased competition for
pipelines such as those owned by Panhandle and Trunkline. A number of new
pipeline and pipeline expansion projects have been approved or are pending
approval by the FERC in order to transport large additional volumes of natural
gas to the Midwest from Canada. These pipelines will be able to compete with gas
transported by Panhandle and Trunkline. Assuming the Acquisition is consummated,
increased competition could reduce the volumes of gas transported by Panhandle
and Trunkline to their existing markets or cause them to lower rates in order to
meet competition. This could lower the financial benefits we expect from the
Acquisition.
 
     Federal regulation of wholesale sales and transmission of electricity and
state regulation of the retail sale and distribution of electricity have also
changed dramatically. This is particularly true since 1992 when the Energy
Policy Act was enacted. This legislation, and FERC regulations which followed it
have effectively granted independent power producers and electricity marketers
"direct access" to the interstate electric transmission systems owned by
electric utilities. All electric utilities are required to offer transmission
services to new market entrants on a non-discriminatory basis. As a result,
wholesale electricity markets have become much more competitive. While this has
not adversely affected us to date, and does present us with opportunities to
expand our market reach for electric power sales by both Consumers and our
non-utility generating facilities, the rapidly changing nature of the
marketplace creates the opportunity for competitors to market electricity to our
wholesale customers, such as municipal systems in Michigan. Ultimately, these
new power suppliers may sell power directly to our retail customers when
Consumers' electric distribution system is open for competitors to transmit
power to Consumers' retail markets. While Consumers would be allowed under
current regulations to charge compensatory rates for distributing electricity
supplied by others, it is uncertain whether Consumers' profit margins on retail
electric service could be maintained over the long run.
 
     The Michigan Public Service Commission ("MPSC") issued several orders in
1997 and 1998 restructuring the electric power industry in Michigan. Under these
orders as currently in effect, Consumers is required to allow customers to elect
to purchase electric power directly from other suppliers, such as independent
power producers, power marketers and other utilities. This direct access
commenced in 1998 and will be phased in to cover 750 MW of Consumers' retail
market by 2001. By January 1, 2002, all of Consumers' customers will have this
option. It is not possible at this time to predict the extent to which
Consumers' customers will elect this option or what the ultimate financial
impact will be to Consumers. Under the current order, however, Consumers
believes it will be
 
                                      S-10
<PAGE>   13
 
able to maintain its profit margins on retail electric service and continue to
expand its retail electric service.
 
     In 1998, the Governor of Michigan supported legislation introduced to
restructure the electric power industry in Michigan in a manner similar to the
MPSC's restructuring orders. The legislation was not enacted, but it is expected
that electric industry restructuring legislation will be reintroduced in 1999.
While Consumers supported the legislation supported by the Governor, the
uncertainty as to whether legislation will be introduced and enacted and what
effect any enacted legislation will have on Consumers represents a risk to
investors purchasing the Notes. Similar uncertainty exists with respect to the
possibility that federal legislation restructuring the electric power industry
will be enacted. A variety of bills changing existing federal regulation of the
industry and, in some cases, affecting state regulation have been introduced in
the Congress in recent years but none has been enacted.
 
     Adverse federal or state legislation or adverse future rate determinations
by the MPSC in the electric markets could result in Consumers being unable to
collect rates sufficient to recover fully its current investment in electric
generating facilities and the cost of purchased power.
 
INTERNATIONAL PROJECT RISKS AND EXCHANGE RATE FLUCTUATIONS
 
     Our international investments in electric generating facilities, oil and
gas production and processing facilities, natural gas pipelines and electric
distribution systems face a number of risks inherent in developing and owning
these types of facilities. There is significant time and expense in preparing
proposals or competitive bids, obtaining the numerous required permits, licenses
and approvals, negotiating the necessary agreements with governmental and
private parties and obtaining financing. Money spent for these purposes is at
risk until all these elements are successfully finalized and it is often
impractical to finalize all elements before significant sums have been spent. As
a result, there is a risk that these up-front expenditures will be of little
value if one of the required approvals or other elements is not finally achieved
and the project does not go forward or is not completed. More importantly,
international investments of the type we are making are subject to the risk that
they may be expropriated or that the required agreements, licenses, permits and
other approvals may be changed or terminated in violation of their terms. In
addition, the local foreign currency may be devalued or the conversion of the
currency may be restricted or prohibited or other actions may be taken which
adversely affect the value and the recovery of the investment such as, taxes,
royalties, or import duties being increased. In some cases the investment may
have to be abandoned or disposed of at a loss. These factors could significantly
adversely affect the financial results of the affected subsidiary and, in turn,
our growth plans for international investments and our financial position and
results of operations.
 
POSSIBLE INABILITY TO PURCHASE NOTES UPON A CHANGE OF CONTROL
 
     In the event of a change of control of our Company, each holder of Notes
may require us to purchase all or a portion of its Notes at a purchase price
equal to 101% of the principal amount thereof, plus accrued interest. Our
ability to purchase the Notes will be limited by the terms of our other debt
agreements and our ability to finance the purchase. It is expected that we will
issue additional debt with similar change of control provisions. If this occurs,
the financial requirements for any purchases could be increased
 
                                      S-11
<PAGE>   14
 
significantly. In addition, the terms of any debt securities issued to purchase
debt under these change of control provisions may be unfavorable to us. We
cannot assure holders of Notes that we will be able to finance these purchase
obligations or obtain consents to do so from holders of Notes under other debt
agreements restricting these purchases.
 
                       RATIO OF EARNINGS TO FIXED CHARGES
 
     The ratio of earnings to fixed charges for each of the years ended December
31, 1993 through 1997 and for the nine months ended September 30, 1998 is as
follows:
 
<TABLE>
<CAPTION>
                                              YEAR ENDED DECEMBER 31,
                                        ------------------------------------    NINE MONTHS ENDED
                                        1993    1994    1995    1996    1997    SEPTEMBER 30, 1998
                                        ----    ----    ----    ----    ----    ------------------
                                                                                   (UNAUDITED)
<S>                                     <C>     <C>     <C>     <C>     <C>     <C>
Ratio of earnings to fixed charges....  1.75    2.07    1.90    1.96    1.78           1.68
</TABLE>
 
     For the purpose of computing the ratio, earnings represent net income
before income taxes, net interest charges and the estimated interest portions of
lease rentals.
 
                                USE OF PROCEEDS
 
     CMS will apply the net proceeds from the sale of the Notes to repay $472
million of its outstanding balance under its $600 million revolving credit
facility with The Chase Manhattan Bank, as lead agent (the "REVOLVING CREDIT
FACILITY"). The Revolving Credit Facility has a weighted average interest rate
of 6.6%.
 
                                      S-12
<PAGE>   15
 
                                 CAPITALIZATION
 
     The following table sets forth the unaudited consolidated capitalization of
the Company at September 30, 1998, and as adjusted to reflect the sale of 4.5
million shares of CMS Energy common stock on November 16, 1998, the sale of the
Notes offered hereby, the application of the estimated net proceeds from such
sale and certain other items referred to below. See "Use of Proceeds." The table
should be read in conjunction with the Company's consolidated financial
statements and notes thereto included in the Incorporated Documents as defined
under "Incorporation of Certain Documents by Reference" in the accompanying base
prospectus.
 
<TABLE>
<CAPTION>
                                                           AS OF SEPTEMBER 30, 1998
                                                           ------------------------
                                                           ACTUAL      AS ADJUSTED
                                                           ------      -----------
                                                            (DOLLARS IN MILLIONS)
                                                                 (UNAUDITED)
<S>                                                        <C>         <C>
Non-current portion of capital leases....................  $   77         $   77
Long-term debt:
  Other long-term debt (excluding current maturities)....   4,248          4,248
  7.5% Senior Notes Due 2009(1)..........................      --            480
                                                           ------         ------
          Total long-term debt...........................   4,325          4,805
                                                           ------         ------
Total stockholders' equity:
  Company-obligated mandatorily redeemable preferred
     securities of:
     Consumers Power Company Financing I(2)..............     100            100
     Consumers Energy Company Financing II(3)............     120            120
  Company-obligated convertible preferred securities of
     CMS Energy Trust I(4)...............................     173            173
  Preferred stock of subsidiary..........................     238            238
  Common stockholders' equity(5).........................   1,922          2,130
                                                           ------         ------
          Total stockholders' equity.....................   2,553          2,761
                                                           ------         ------
             Total capitalization........................  $6,878         $7,566
                                                           ======         ======
</TABLE>
 
- -------------------------
 
     (1) Adjusted to reflect the issuance of $480 million principal amount of
         7.5% Senior Notes Due 2009.
 
     (2) The primary asset of Consumers Power Company Financing I is
         approximately $103 million principal amount of 8.36% subordinated
         interest notes due 2015 from Consumers.
 
     (3) The primary asset of Consumers Energy Company Financing II is
         approximately $124 million principal amount of 8.20% subordinated
         interest notes due 2027 from Consumers.
 
     (4) The primary asset of CMS Energy Trust I is approximately $178 million
         principal amount of 7.75% convertible subordinated debentures due 2027
         from the Company.
 
     (5) Adjusted to reflect the issuance of 4.5 million shares of CMS Energy
         common stock on November 16, 1998.
 
                                      S-13
<PAGE>   16
 
                                  THE COMPANY
 
     We are a leading diversified energy company operating in the United States
and around the world. Our two principal subsidiaries are Consumers and
Enterprises. Consumers is a public utility that provides natural gas and
electricity to almost six million of the nine and one-half million residents in
Michigan's Lower Peninsula. Enterprises, through subsidiaries, is engaged in
several domestic and international energy businesses including:
 
          - Transmission, storage and processing of natural gas;
 
          - Independent power production;
 
          - Oil and gas exploration and production;
 
          - International energy distribution; and
 
          - Energy marketing, services and trading.
 
     Our consolidated operating revenue in 1997 was $4.8 billion. 53% of our
consolidated operating revenue was derived from electric utility operations, 25%
from gas utility operations, 14% from energy marketing, services and trading
operations, 4% from independent power production and other non-utility
operations, 2% from transmission, storage and processing of natural gas, and 2%
from oil and gas exploration and production operations.
 
     Consumers' consolidated operations account for a majority of our total
assets, revenues and income. Consumers' service areas include automotive, metal,
chemical, food and wood products and a diversified group of other industries. At
year end 1997, Consumers provided service to 1.6 million electric customers and
1.5 million gas customers. Consumers' consolidated operating revenue in 1997 was
$3.8 billion. 67% of Consumers' operating revenue was generated from its
electric utility business, 32% from its gas utility business, and 1% from its
non-utility business.
 
CONSUMERS
 
  ELECTRIC UTILITY OPERATIONS
 
     Consumers' electric utility operation constitutes the twelfth largest
electric company in the U.S. It serves 1.6 million customers in 61 of 68 of
Michigan's Lower Peninsula counties. Principal cities served include Battle
Creek, Flint, Grand Rapids, Jackson, Kalamazoo, Midland, Muskegon, and Saginaw.
Consumers' electric utility customer base includes a mix of residential,
commercial, and diversified industrial customers, the largest segment of which
is the automotive industry. Consumers' electric operations are not dependent
upon a single customer, or even a few customers, and the loss of any one or even
a few of such customers would not have a material adverse effect on its
financial condition.
 
     Consumers' owned and operated an aggregate of 6,255 megawatts ("MW") of
electric generating capacity in 1997. In 1997, Consumers purchased 1,648 MW of
net capacity, which amounted to 34.3% percent of Consumers' total system
requirements, from independent power producers, the largest being the MCV
Partnership. Total electric sales in 1997 were 38 billion kilowatt hours
("KWH"), a 2.3% increase over 1996 levels. Consumers' electric operating revenue
in 1997 was $2.5 billion. Electric operating revenue has grown at a compound
annual growth rate of 5% for the five years ended 1997.
 
                                      S-14
<PAGE>   17
 
  GAS UTILITY OPERATIONS
 
     Consumers' gas utility operation purchases, transports, stores and
distributes natural gas. It renders gas service to 1.5 million customers and is
authorized to serve in 54 of the 68 counties in Michigan's Lower Peninsula.
Principal cities served include Bay City, Flint, Jackson, Kalamazoo, Lansing,
Pontiac and Saginaw, as well as the suburban Detroit area. Consumers owns gas
transmission and distribution mains and other gas lines, compressor stations and
facilities, storage rights, wells and gathering facilities in several storage
fields in Michigan. Consumers and its wholly-owned subsidiary, Michigan Gas
Storage, inject natural gas into storage during the summer months of the year
for use during the winter months when demand is higher. Consumers' gas operation
is not dependent upon a single customer, or even a few customers, and the loss
of any one or even a few of such customers would not have a material adverse
effect on its financial condition.
 
     Consumers' gas operation is seasonal to the extent that peak demand occurs
in winter due to colder temperatures. Total deliveries of natural gas sold by
Consumers and from other sellers over Consumers' pipeline and distribution
network to ultimate customers, including the MCV Partnership, totaled 420
billion cubic feet ("BCF") in 1997. Consumers' gas operating revenue in 1997 was
$1.2 billion. Gas operating revenue has grown at a compound annual growth rate
of 1% for the five years ended 1997.
 
ENTERPRISES
 
  TRANSMISSION, STORAGE AND PROCESSING OF NATURAL GAS
 
     CMS Gas Transmission and Storage ("CMS GTS"), formed in 1988, owns,
develops and manages domestic and international natural gas transmission,
processing and storage projects. CMS GTS owns interests in 13 domestic and 3
international natural gas facilities consisting of a total of 5,500 miles of
pipeline with a daily capacity of approximately 2.6 Bcf/d. In addition, CMS GTS
has processing capabilities of over 420 million cubic feet per day ("MMCF/D") of
natural gas. In our Michigan CO(2) removal plants, we process over 330 MMcf/d,
representing more natural gas processed than any other processor in the state.
 
     We have expanded the importance of this line of business with the recent
acquisition of a natural gas pipeline in Western Australia and a gathering
system in the panhandle region of Texas and Oklahoma. In addition, CMS GTS will
become more significant upon consummation of the pending acquisition of the
Panhandle Companies. See "Prospectus Supplement Summary--Recent
Developments--Acquisition of the Panhandle Companies."
 
     CMS GTS's operating revenue in 1997 was $96 million. Its operating revenue
has grown at a compound annual growth rate of 96% for the three years ended
1997.
 
  INDEPENDENT POWER PRODUCTION
 
     CMS Generation, formed in 1986, invests in, acquires, develops, constructs
and operates non-utility power generation projects both in the United States and
internationally. As of December 31, 1997, CMS Generation had ownership interests
in 32 operating power plants totaling 7,300 (gross) MW (3,236 MW net) throughout
the United States and in Argentina, Australia, India, Jamaica, Morocco and the
Philippines. Our net generating capacity has more than tripled since 1993.
Projects range in size from 3 MW to 2,000 MW and are fueled by hydro, coal,
natural gas, oil, wood, wind, and waste
 
                                      S-15
<PAGE>   18
 
material. Additional projects totaling approximately 6,800 gross MW are under
construction or advanced development.
 
     The rapid growth in our generating capacity has been matched by growth in
this business segment's operating revenue. CMS Generation's operating revenue in
1997 was $168 million. Independent power production operating revenue has grown
at a compound annual growth rate of 68% for the five years ended 1997.
 
  OIL AND GAS EXPLORATION AND PRODUCTION
 
     CMS Oil & Gas (formerly known as CMS NOMECO Oil & Gas), formed in 1967,
conducts oil and gas exploration and development operations throughout the U.S.
and seven other countries. Most of the domestic operations focus on gas
exploration and production in Michigan and Louisiana while the international
operations focus on oil exploration and production and are distributed across
three other continents.
 
     CMS Oil & Gas achieved record production levels in 1997 of 6.9 million
barrels and 27.2 Bcf. CMS Oil & Gas' proven oil and gas reserves total 152
million net equivalent barrels reflecting a balanced portfolio of high-quality
reserves, including 65% oil and condensate and 35% natural gas.
 
     CMS Oil & Gas' operating revenue was $93 million in 1997. CMS Oil & Gas
exploration and production operating revenue has grown at a compound annual
growth rate of 7% for the five years ended 1997.
 
  INTERNATIONAL ENERGY DISTRIBUTION
 
     CMS Electric and Gas Distribution, formed in 1996, is our international
energy distribution subsidiary. We have ownership interests in electric
distribution companies which provide service in the states of Rio de Janeiro,
Sergipe and Minas Gerais in Brazil, the province of Entre Rios in Argentina, and
the area of Margarita Island in Venezuela. These electric distribution companies
serve a total of 944,000 customers with electricity sales of 4,455 GWh in 1998.
We are currently negotiating on an exclusive basis for the acquisition of
Turkey's Bursa-Yalova electric distribution system which distributes 3,300 GWh
of electricity annually to 700,000 customers near Bursa, about 60 miles south of
Istanbul.
 
  ENERGY MARKETING, SERVICES AND TRADING
 
     CMS Marketing, Services and Trading ("CMS MST"), formed in 1996, provides
gas, oil, coal and electric marketing, risk management and energy management
services to industrial, commercial, utility and municipal energy users
throughout the United States and internationally. CMS MST has grown dramatically
since its inception. Currently, it has more than 7,000 customers, including 30
major gas distribution companies and is active in 25 states and 3 countries. CMS
MST's operating revenue in 1997 was $692 million.
 
                                      S-16
<PAGE>   19
 
                            DESCRIPTION OF THE NOTES
 
GENERAL
 
     The following information concerning the Notes supplements, and should be
read in conjunction with, the statements under "Descriptions of Debt Securities"
in the accompanying base prospectus. Capitalized terms not defined herein are
used as defined in the accompanying base prospectus.
 
     The Notes will be issued as a series of Senior Debt Securities under the
Senior Debt Indenture as supplemented by the Seventh Supplemental Indenture
thereto dated as of January 25, 1999 (the "SUPPLEMENTAL INDENTURE"), and will be
limited in aggregate principal amount to $480 million.
 
     The Notes will be unsecured debt securities of the Company.
 
     As of September 30, 1998 the Company had outstanding approximately $2.321
billion aggregate principal amount of indebtedness, none of which was secured.
None of such indebtedness would be senior to the Notes and the Notes will not be
senior to such indebtedness, except that the Notes will be senior to certain
subordinated debentures in aggregate principal amount of $178 million, issued in
connection with certain preferred securities of a subsidiary trust. The Notes
will rank equally in right of payment with all other unsecured and
unsubordinated indebtedness of the Company.
 
     CMS Energy is a holding company and its assets consist primarily of
investments in its subsidiaries. The Notes will be obligations exclusively of
CMS Energy. CMS Energy's ability to service its indebtedness, including the
Notes, is dependent primarily upon the earnings of its subsidiaries and the
distribution or other payment of such earnings to CMS Energy in the form of
dividends, loans or advances, and repayment of loans and advances from CMS
Energy. The subsidiaries are separate and distinct legal entities and have no
obligation, contingent or otherwise, to pay any amounts due pursuant to the
Notes or to make any funds available therefor, whether by dividends, loans or
other payments.
 
     A substantial portion of the consolidated liabilities of CMS Energy has
been incurred by its subsidiaries. Therefore, CMS Energy's rights and the rights
of its creditors, including Holders of Notes, to participate in the distribution
of assets of any subsidiary upon the latter's liquidation or reorganization will
be subject to prior claims of the subsidiary's creditors, including trade
creditors, except to the extent that CMS Energy may itself be a creditor with
recognized claims against the subsidiary (in which case the claims of CMS Energy
would still be subject to the prior claims of any secured creditor of such
subsidiary and of any holder of indebtedness of such subsidiary that is senior
to that held by CMS Energy).
 
     The Notes will be issued in the form of one or more global notes (each, a
"GLOBAL NOTE"), in registered form, without coupons, in denominations of $1,000
or an integral multiple thereof as described under "Book-Entry System." The
Global Notes will be registered in the name of a nominee of the Depository Trust
Company ("DTC"). Except as set forth herein under "Certificated Notes," owners
of beneficial interests in a Global Note will not be entitled to have Notes
registered in their names, will not receive or be entitled to receive physical
delivery of any such Note and will not be considered the registered holder
thereof under the Senior Debt Indenture.
 
                                      S-17
<PAGE>   20
 
PAYMENT AND MATURITY
 
     The Notes will mature on January 15, 2009, and will bear interest at the
rate of 7.5% per annum. At maturity, the Company will pay the aggregate
principal amount of the Notes then outstanding.
 
     Each Note will bear interest from the original date of issue, payable
semiannually in arrears on January 15, and July 15, commencing July 15, 1999,
and at maturity.
 
     In any case where any interest payment date, repurchase date or maturity of
any Note shall not be a Business Day (as hereinafter defined) at any place of
payment, then payment of interest or principal (and premium, if any) need not be
made on such date, but may be made on the next succeeding Business Day at such
place of payment with the same force and effect as if made on the interest
payment date, repurchase date or at maturity; and no interest shall accrue on
the amount so payable for the period from and after such interest payment date,
redemption date, repurchase date or maturity, as the case may be, to such
Business Day.
 
REDEMPTION
 
     The Notes will be redeemable at the Company's option, in whole or in part,
at any time or from time to time, at a redemption price equal to 100% of the
principal amount of such Notes being redeemed plus the Applicable Premium, if
any, thereon at the time of redemption, together with accrued interest, if any,
thereon to the redemption date. In no event will the redemption price be less
than 100% of the principal amount of the Notes plus accrued interest, if any,
thereon to the redemption date.
 
     The following definitions are used to determine the Applicable Premium:
 
     "APPLICABLE PREMIUM" means, with respect to a Note (or portion thereof)
     being redeemed at any time, the excess of (A) the present value at such
     time of the principal amount of such Note (or portion thereof) being
     redeemed plus all interest payments due on such Note (or portion thereof)
     after the redemption date, which present value shall be computed using a
     discount rate equal to the Treasury Rate plus 50 basis points, over (B) the
     principal amount of such Note (or portion thereof) being redeemed at such
     time. For purposes of this definition, the present values of interest and
     principal payments will be determined in accordance with generally accepted
     principles of financial analysis.
 
     "TREASURY RATE" means the yield to maturity at the time of computation of
     United States Treasury securities with a constant maturity (as compiled and
     published in the most recent Federal Reserve Statistical Release H.15(519)
     (the "STATISTICAL RELEASE") which has become publicly available at least
     two Business Days prior to the redemption date or, in the case of
     defeasance, prior to the date of deposit (or, if such Statistical Release
     is no longer published, any publicly available source of similar market
     data)) most nearly equal to the then remaining average life to stated
     maturity of the Notes; provided, however, that if the average life to
     stated maturity of the Notes is not equal to the constant maturity of a
     United States Treasury security for which a weekly average yield is given,
     the Treasury Rate shall be obtained by linear interpolation (calculated to
     the nearest one-twelfth of a year) from the weekly average yields of United
     States Treasury securities for which such yields are given.
 
                                      S-18
<PAGE>   21
 
     If less than all of the Notes are to be redeemed, the Trustee shall select,
in such manner as it shall deem appropriate and fair, the particular Notes or
portions thereof to be redeemed. Notice of redemption shall be given by mail not
less than 30 nor more than 60 days prior to the date fixed for redemption to the
Holders of Notes to be redeemed (which, as long as the Notes are held in the
book-entry only system, will be DTC (or its nominee) or a successor depositary);
provided, however, that the failure to duly give such notice by mail, or any
defect therein, shall not affect the validity of any proceedings for the
redemption of Notes as to which there shall have been no such failure or defect.
On and after the date fixed for redemption (unless the Company shall default in
the payment of the Notes or portions thereof to be redeemed at the applicable
redemption price, together with accrued interest, if any, thereon to such date),
interest on the Notes or the portions thereof so called for redemption shall
cease to accrue.
 
     No sinking fund is provided for the Notes.
 
PURCHASE OF NOTES UPON CHANGE IN CONTROL
 
     In the event of any Change in Control (as defined below) each Holder of a
Note will have the right, at such Holder's option, subject to the terms and
conditions of the Senior Debt Indenture, to require the Company to repurchase
all or any part of such Holder's Note on a date selected by the Company that is
no earlier than 60 days nor later than 90 days (the "CHANGE IN CONTROL PURCHASE
DATE") after the mailing of written notice by the Company of the occurrence of
such Change in Control, at a repurchase price payable in cash equal to 101% of
the principal amount of such Notes plus accrued interest, if any, thereon to the
Change in Control Purchase Date (the "CHANGE IN CONTROL PURCHASE PRICE").
 
     Within 30 days after the Change in Control Date, the Company is obligated
to mail to each Holder of a Note a notice regarding the Change in Control, which
notice shall state, among other things: (i) that a Change in Control has
occurred and that each such Holder has the right to require the Company to
repurchase all or any part of such Holder's Notes at the Change in Control
Purchase Price; (ii) the Change in Control Purchase Price; (iii) the Change in
Control Purchase Date; (iv) the name and address of the Paying Agent; and (v)
the procedures that Holders must follow to cause the Notes to be repurchased.
 
     To exercise this right, a Holder must deliver a written notice (the "CHANGE
IN CONTROL PURCHASE NOTICE") to the Paying Agent at its corporate trust office
in Detroit, Michigan, or any other office of the Paying Agent maintained for
such purposes, not later than 30 days prior to the Change in Control Purchase
Date. The Change in Control Purchase Notice shall state (i) the portion of the
principal amount of any Notes to be repurchased, which must be $1,000 or an
integral multiple thereof; (ii) that such Notes are to be repurchased by the
Company pursuant to the applicable change-in-control provisions of the Senior
Debt Indenture; and (iii) unless the Notes are represented by one or more Global
Notes, the certificate numbers of the Notes to be repurchased.
 
     Any Change in Control Purchase Notice may be withdrawn by the Holder by a
written notice of withdrawal delivered to the Paying Agent not later than three
Business Days prior to the Change in Control Purchase Date. The notice of
withdrawal shall state the principal amount and, if applicable, the certificate
numbers of the Notes as to which the withdrawal notice relates and the principal
amount, if any, which remains subject to a Change in Control Purchase Notice.
 
                                      S-19
<PAGE>   22
 
     If a Note is represented by a Global Note, the Depositary (as defined
herein) or its nominee will be the holder of such Note and therefore will be the
only entity that can require the Company to repurchase Notes upon a Change in
Control. To obtain repayment with respect to such Note upon a Change in Control,
the beneficial owner of such Note must provide to the broker or other entity
through which it holds the beneficial interest in such Note (i) the Change in
Control Purchase Notice signed by such beneficial owner, and such signature must
be guaranteed by a member firm of a registered national securities exchange or
of the National Association of Securities Dealers, Inc. ("NASD") or a commercial
bank or trust company having an office or correspondent in the United States and
(ii) instructions to such broker or other entity to notify the Depositary of
such beneficial owner's desire to cause the Company to repurchase such Notes.
Such broker or other entity will provide to the Paying Agent (i) a Change in
Control Purchase Notice received from such beneficial owner and (ii) a
certificate satisfactory to the Paying Agent from such broker or other entity
that it represents such beneficial owner. Such broker or other entity will be
responsible for disbursing any payments it receives upon the repurchase of such
Notes by the Company.
 
     Payment of the Change in Control Purchase Price for a Note in registered,
certificated form (a "CERTIFICATED NOTE") for which a Change in Control Purchase
Notice has been delivered and not withdrawn is conditioned upon delivery of such
Certificated Note (together with necessary endorsements) to the Paying Agent at
its office in Detroit, Michigan, or any other office of the Paying Agent
maintained for such purpose, at any time (whether prior to, on or after the
Change in Control Purchase Date) after the delivery of such Change in Control
Purchase Notice. Payment of the Change in Control Purchase Price for such
Certificated Note will be made promptly following the later of the Change in
Control Purchase Date or the time of delivery of such Certificated Note.
 
     If the Paying Agent holds, in accordance with the terms of the Senior Debt
Indenture, money sufficient to pay the Change in Control Purchase Price of a
Note on the Business Day following the Change in Control Purchase Date for such
Note, then, on and after such date, interest on such Note will cease to accrue,
whether or not such Note is delivered to the Paying Agent, and all other rights
of the Holder shall terminate (other than the right to receive the Change in
Control Purchase Price upon delivery of the Note).
 
     Under the Senior Debt Indenture, a "CHANGE IN CONTROL" means an event or
series of events by which (i) the Company ceases to beneficially own, directly
or indirectly, at least 80% of the total voting power of all classes of Capital
Stock then outstanding of Consumers (whether arising from issuance of securities
of the Company or Consumers, any direct or indirect transfer of securities by
the Company or Consumers, any merger, consolidation, liquidation or dissolution
of the Company or Consumers or otherwise); or (ii) any "person" or "group" (as
such terms are used in Sections 13(d) and 14(d) of the Exchange Act) becomes the
"beneficial owner" (as such term is used in Rules 13d-3 and 13d-5 under the
Exchange Act, except that a person or group shall be deemed to have "beneficial
ownership" of all shares that such person or group has the right to acquire,
whether such right is exercisable immediately or only after the passage of
time), directly or indirectly, of more than 35% of the Voting Stock of the
Company; or (iii) the Company consolidates with or merges into another
corporation or directly or indirectly conveys, transfers or leases all or
substantially all of its assets to any person, or any corporation consolidates
with or merges into the Company, in either event pursuant to a transaction in
which the outstanding Voting Stock of the Company is changed into or exchanged
for cash, securities, or other property, other than any such transaction where
(A) the
 
                                      S-20
<PAGE>   23
 
outstanding Voting Stock of the Company is changed into or exchanged for Voting
Stock of the surviving corporation and (B) the holders of the Voting Stock of
the Company immediately prior to such transaction retain, directly or
indirectly, substantially proportionate ownership of the Voting Stock of the
surviving corporation immediately after such transaction.
 
     The Senior Debt Indenture requires the Company to comply with the
provisions of Regulation 14E and any other tender offer rules under the Exchange
Act which may then be applicable in connection with any offer by the Company to
purchase Notes at the option of Holders upon a Change in Control. The Change in
Control purchase feature of the Notes may in certain circumstances make more
difficult or discourage a takeover of the Company and, thus, the removal of
incumbent management. The Change in Control purchase feature, however, is not
the result of management's knowledge of any specific effort to accumulate shares
of its common stock or to obtain control of the Company by means of a merger,
tender offer, solicitation or otherwise, or part of a plan by management to
adopt a series of anti-takeover provisions. Instead, the Change in Control
purchase feature is a term contained in many similar debt offerings and the
terms of such feature result from negotiations between the Company and the
Underwriters. Management has no present intention to propose any anti-takeover
measures although it is possible that the Company could decide to do so in the
future.
 
     No Note may be repurchased by the Company as a result of a Change of
Control if there has occurred and is continuing an Event of Default described
under "Events of Default" below or in the accompanying base prospectus (other
than a default in the payment of the Change in Control Purchase Price with
respect to the Notes). In addition, the Company's ability to purchase Notes may
be limited by its financial resources and its inability to raise the required
funds because of restrictions on issuance of securities contained in other
contractual arrangements.
 
CERTAIN RESTRICTIVE COVENANTS
 
     The Senior Debt Indenture contains the covenants described below. Certain
capitalized terms used below are defined herein under the heading "Certain
Definitions."
 
  LIMITATION ON RESTRICTED PAYMENTS
 
     Under the terms of the Senior Debt Indenture, so long as any of the Notes
are Outstanding and until the Notes are rated BBB- or above (or an equivalent
rating) by Standard & Poor's and one Other Rating Agency, at which time the
Company will be permanently released from the provisions of this "Limitation on
Restricted Payments," the Company will not, and will not permit any of its
Restricted Subsidiaries, directly or indirectly, to (i) declare or pay any
dividend or make any distribution on the Capital Stock of the Company to the
direct or indirect holders of its Capital Stock (except dividends or
distributions payable solely in its Non-Convertible Capital Stock or in options,
warrants or other rights to purchase such Non-Convertible Capital Stock and
except dividends or distributions payable to the Company or a Subsidiary), (ii)
purchase, redeem or otherwise acquire or retire for value any Capital Stock of
the Company, or (iii) purchase, repurchase, redeem, defease or otherwise acquire
or retire for value, prior to scheduled maturity or scheduled repayment thereof,
any Subordinated Indebtedness (any such dividend, distribution, purchase,
redemption, repurchase, defeasing, other acquisition or retirement being
hereinafter referred to as a "RESTRICTED PAYMENT") if at the time the
 
                                      S-21
<PAGE>   24
 
Company or such Subsidiary makes such Restricted Payment: (1) an Event of
Default, or an event that with the lapse of time or the giving of notice or both
would constitute an Event of Default, shall have occurred and be continuing (or
would result therefrom); or (2) the aggregate amount of such Restricted Payment
and all other Restricted Payments made since May 6, 1997 would exceed the sum
of: (a) $100,000,000 plus 100% of Consolidated Net Income from May 6, 1997 to
the end of the most recent fiscal quarter ending at least 45 days prior to the
date of such Restricted Payment (or, in case such sum shall be a deficit, minus
100% of the deficit) and (b) the aggregate Net Cash Proceeds received by the
Company from the issue or sale of or contribution with respect to its Capital
Stock after May 6, 1997.
 
     The foregoing provisions will not prohibit: (i) dividends or other
distributions paid in respect of any class of Capital Stock issued by the
Company in connection with the acquisition of any business or assets by the
Company or a Restricted Subsidiary where the dividends or other distributions
with respect to such Capital Stock are payable solely from the net earnings of
such business or assets; (ii) any purchase or redemption of Capital Stock of the
Company made by exchange for, or out of the proceeds of the substantially
concurrent sale of, Capital Stock of the Company (other than Redeemable Stock or
Exchangeable Stock); (iii) dividends paid within 60 days after the date of
declaration thereof if at such date of declaration such dividends would have
complied with this covenant; or (iv) payments pursuant to the Tax Sharing
Agreement.
 
  LIMITATION ON CERTAIN LIENS
 
     Under the terms of the Senior Debt Indenture, so long as any of the Notes
are Outstanding, the Company shall not create, incur, assume or suffer to exist
any Lien upon or with respect to any of its property of any character, including
without limitation any shares of Capital Stock of Consumers or Enterprises,
without making effective provision whereby the Notes shall be (so long as any
such other creditor shall be so secured) equally and ratably secured. The
foregoing restrictions shall not apply to (a) Liens securing Indebtedness of the
Company, provided that on the date such Liens are created, and after giving
effect to such Indebtedness, the aggregate principal amount at maturity of all
the secured Indebtedness of the Company at such date shall not exceed 5% of
Consolidated Net Tangible Assets or (b) certain liens for taxes, pledges to
secure workman's compensation, other statutory obligations and Support
Obligations, certain materialmen's, mechanic's and similar liens and certain
purchase money liens.
 
  LIMITATION ON ASSET SALES
 
     Under the terms of the Senior Debt Indenture, so long as any of the Notes
are outstanding, the Company may not sell, transfer or otherwise dispose of any
property or assets of the Company, including Capital Stock of any Consolidated
Subsidiary, in one transaction or a series of transactions in an amount which
exceeds $50,000,000 (an "ASSET SALE") unless the Company shall (i) apply an
amount equal to such excess Net Cash Proceeds to permanently repay Indebtedness
of a Consolidated Subsidiary or Indebtedness of the Company which is pari passu
with the Notes or (ii) invest an equal amount not so used in clause (i) in
property or assets of related business within 24 months after the date of the
Asset Sale (the "APPLICATION PERIOD") or (iii) apply such excess Net Cash
Proceeds not so used in (i) or (ii) (the "EXCESS PROCEEDS") to make an offer,
within 30 days after the end of the Application Period, to purchase from the
Holders on a pro rata basis an aggregate principal amount of Notes on the
relevant purchase date equal to
 
                                      S-22
<PAGE>   25
 
the Excess Proceeds on such date, at a purchase price equal to 100% of the
principal amount of the Notes on the relevant purchase date and unpaid interest,
if any, to the purchase date. The Company shall only be required to make an
offer to purchase Notes from Holders pursuant to subsection (iii) if the Excess
Proceeds equal or exceed $25,000,000 at any given time.
 
     The procedures to be followed by the Company in making an offer to purchase
Notes from the Holders with Excess Proceeds, and for the acceptance of such
offer by the Holders, shall be the same as those set forth above in "Purchase of
Notes Upon Change of Control" with respect to a Change in Control.
 
  LIMITATION ON CONSOLIDATION, MERGER, SALE OR CONVEYANCE
 
     In addition to the terms of the Senior Debt Indenture relating to
consolidations or mergers described in the accompanying base prospectus, so long
as any of the Notes are Outstanding and until the Notes are rated BBB- or above
(or an equivalent rating) by Standard & Poor's and one Other Rating Agency, at
which time the Company will be permanently released from the provisions of this
"Limitation on Consolidation, Merger, Sale or Conveyance" (but not from the
provisions described in the accompanying base prospectus which permit a
consolidation or merger provided that the surviving corporation assumes the
obligations of the Company under the Notes and the Senior Debt Indenture and is
organized and existing under the laws of the United States of America, any state
thereof or the District of Columbia), the Company shall not consolidate with or
merge into any other Person or sell, lease or convey the property of the Company
in the entirety or substantially as an entirety, unless (i) immediately after
giving effect to such transaction the Consolidated Net Worth of the surviving
entity is at least equal to the Consolidated Net Worth of the Company
immediately prior to the transaction, and (ii) after giving effect to such
transaction, the surviving entity would be entitled to incur at least one dollar
of additional Indebtedness (other than revolving Indebtedness to banks) pursuant
to the first paragraph under "--Limitation on Consolidated Indebtedness" below.
Notwithstanding the foregoing provisions, such a transaction may constitute a
Change of Control as described in "--Purchase of Notes Upon Change in Control"
above and give rise to the right of a Holder to require the Company to
repurchase all or part of such Holder's Notes.
 
  LIMITATION ON CONSOLIDATED INDEBTEDNESS
 
     Under the terms of the Senior Debt Indenture, so long as any of the Notes
are Outstanding and until the Notes are rated BBB- or above (or an equivalent
rating) by Standard & Poor's and one Other Rating Agency, at which time the
Company will be permanently released from the provisions of this "Limitation on
Consolidated Indebtedness," the Company will not, and will not permit any of its
Consolidated Subsidiaries to, issue, create, assume, guarantee, incur or
otherwise become liable for (collectively, "ISSUE"), directly or indirectly, any
Indebtedness unless the Consolidated Coverage Ratio of the Company and its
Consolidated Subsidiaries for the four consecutive fiscal quarters immediately
preceding the issuance of such Indebtedness (as shown by a pro forma
consolidated income statement of the Company and its Consolidated Subsidiaries
for the four most recent fiscal quarters ending at least 30 days prior to the
issuance of such Indebtedness after giving effect to (i) the issuance of such
Indebtedness and (if applicable) the application of the net proceeds thereof to
refinance other Indebtedness as if such Indebtedness was issued at the beginning
of the period, (ii) the
 
                                      S-23
<PAGE>   26
 
issuance and retirement of any other Indebtedness since the first day of the
period as if such Indebtedness was issued or retired at the beginning of the
period and (iii) the acquisition of any company or business acquired by the
Company or any Subsidiary since the first day of the period (including giving
effect to the pro forma historical earnings of such company or business),
including any acquisition which will be consummated contemporaneously with the
issuance of such Indebtedness, as if in each case such acquisition occurred at
the beginning of the period) exceeds a ratio of 1.7 to 1.0.
 
     The foregoing limitation is subject to exceptions for: (i) Indebtedness of
the Company to banks not to exceed $1,000,000,000 in aggregate outstanding
principal amount at any time; (ii) Indebtedness outstanding on the date of the
Supplemental Indenture and certain refinancings thereof; (iii) certain
refinancings and Indebtedness of the Company to a Subsidiary or by a Subsidiary
to the Company; (iv) Indebtedness of a Consolidated Subsidiary issued to
acquire, develop, improve, construct or to provide working capital for a gas,
oil or electric generation, exploration, production, distribution, storage or
transmission facility and related assets provided that such Indebtedness is
without recourse to any assets of the Company, Consumers, Enterprises, CMS
Generation, CMS Oil & Gas, CMS Electric and Gas, CMS Gas Transmission and
Storage, CMS MST or any other Designated Enterprises Subsidiary; (v)
Indebtedness of a Person existing at the time at which such Person became a
Subsidiary and not incurred in connection with, or in contemplation of, such
Person becoming a Subsidiary; (vi) Indebtedness issued by the Company not to
exceed $150,000,000 in aggregate outstanding principal amount at any time; and
(vii) Indebtedness of a Consolidated Subsidiary in respect of rate reduction
bonds issued to recover electric restructuring transition costs of Consumers
provided that such Indebtedness is without recourse to the assets of Consumers.
 
CERTAIN DEFINITIONS
 
     Set forth below is a summary of certain defined terms used in the Senior
Debt Indenture. Reference is made to the Senior Debt Indenture for a full
definition of all terms as well as any other capitalized terms used herein and
not otherwise defined.
 
     "Business Day" means a day on which banking institutions in New York, New
York or Detroit, Michigan are not authorized or required by law or regulation to
close.
 
     "Capital Lease Obligation" of a Person means any obligation that is
required to be classified and accounted for as a capital lease on the face of a
balance sheet of such Person prepared in accordance with generally accepted
accounting principles; the amount of such obligation shall be the capitalized
amount thereof, determined in accordance with generally accepted accounting
principles; the stated maturity thereof shall be the date of the last payment of
rent or any other amount due under such lease prior to the first date upon which
such lease may be terminated by the lessee without payment of a penalty; and
such obligation shall be deemed secured by a Lien on any property or assets to
which such lease relates.
 
     "Capital Stock" means any and all shares, interests, rights to purchase,
warrants, options, participations or other equivalents of or interests in
(however designated) corporate stock, including any Preferred Stock or letter
stock; provided that Hybrid Preferred Securities are not considered Capital
Stock for purposes of this definition.
 
     "CMS Electric and Gas" means CMS Electric and Gas Company, a Michigan
corporation and wholly-owned subsidiary of Enterprises.
 
                                      S-24
<PAGE>   27
 
     "CMS Gas Transmission and Storage" means CMS Gas Transmission and Storage
Company, a Michigan corporation and wholly-owned subsidiary of Enterprises.
 
     "CMS Generation" means CMS Generation Co., a Michigan corporation and
wholly-owned subsidiary of Enterprises.
 
     "CMS MST" means CMS Marketing, Services and Trading Company, a Michigan
corporation and wholly-owned subsidiary of Enterprises.
 
     "CMS Oil & Gas" means, CMS Oil & Gas Co. (formerly known as, "CMS NOMECO
Oil & Gas Co."), a Michigan corporation and wholly-owned subsidiary of the
Company.
 
     "Consolidated Assets" means, at any date of determination, the aggregate
assets of the Company and its Consolidated Subsidiaries determined on a
consolidated basis in accordance with generally accepted accounting principles.
 
     "Consolidated Coverage Ratio" with respect to any period means the ratio of
(i) the aggregate amount of Operating Cash Flow for such period to (ii) the
aggregate amount of Consolidated Interest Expense for such period.
 
     "Consolidated Current Liabilities" means, for any period, the aggregate
amount of liabilities of the Company and its Consolidated Subsidiaries which may
properly be classified as current liabilities (including taxes accrued as
estimated), after (i) eliminating all inter-company items between the Company
and any Consolidated Subsidiary and (ii) deducting all current maturities of
long-term Indebtedness, all as determined in accordance with generally accepted
accounting principles.
 
     "Consolidated Indebtedness" means, at any date of determination, the
aggregate Indebtedness of the Company and its Consolidated Subsidiaries
determined on a consolidated basis in accordance with generally accepted
accounting principles; provided that Consolidated Indebtedness shall not include
any subordinated debt owned by any Hybrid Preferred Securities Subsidiary.
 
     "Consolidated Interest Expense" means, for any period, the total interest
expense in respect of Consolidated Indebtedness of the Company and its
Consolidated Subsidiaries, including, without duplication, (i) interest expense
attributable to capital leases, (ii) amortization of debt discount, (iii)
capitalized interest, (iv) cash and noncash interest payments, (v) commissions,
discounts and other fees and charges owed with respect to letters of credit and
bankers' acceptance financing, (vi) net costs under Interest Rate Protection
Agreements (including amortization of discount) and (vii) interest expense in
respect of obligations of other Persons deemed to be Indebtedness of the Company
or any Consolidated Subsidiaries under clause (v) or (vi) of the definition of
Indebtedness, provided, however, that Consolidated Interest Expense shall
exclude (a) any costs otherwise included in interest expense recognized on early
retirement of debt and (b) any interest expense in respect of any Indebtedness
of any Subsidiary of Consumers, CMS Generation, CMS Oil & Gas, CMS Electric and
Gas, CMS Gas Transmission and Storage, CMS MST or any other Designated
Enterprises Subsidiary provided that such Indebtedness is without recourse to
any assets of the Company, Consumers, Enterprises, CMS Generation, CMS Oil &
Gas, CMS Electric and Gas, CMS Gas Transmission and Storage, CMS MST or any
other Designated Enterprises Subsidiary.
 
     "Consolidated Net Income" means, for any period, the net income of the
Company and its Consolidated Subsidiaries determined on a consolidated basis in
accordance with
 
                                      S-25
<PAGE>   28
 
generally accepted accounting principles; provided, however, that there shall
not be included in such Consolidated Net Income (i) any net income of any Person
if such Person is not a Subsidiary, except that (A) the Company's equity in the
net income of any such Person for such period shall be included in such
Consolidated Net Income up to the aggregate amount of cash actually distributed
by such Person during such period to the Company or a Consolidated Subsidiary as
a dividend or other distribution and (B) the Company's equity in a net loss of
any such Person for such period shall be included in determining such
Consolidated Net Income; (ii) any net income of any Person acquired by the
Company or a Subsidiary in a pooling of interests transaction for any period
prior to the date of such acquisition; (iii) any gain or loss realized upon the
sale or other disposition of any property, plant or equipment of the Company or
its Consolidated Subsidiaries which is not sold or otherwise disposed of in the
ordinary course of business and any gain or loss realized upon the sale or other
disposition of any Capital Stock of any Person; and (iv) any net income of any
Subsidiary of Consumers, CMS Generation, CMS Oil & Gas, CMS Electric and Gas,
CMS Gas Transmission and Storage, CMS MST or any other Designated Enterprises
Subsidiary whose interest expense is excluded from Consolidated Interest
Expense, provided, however, that for purposes of this subsection (iv), any cash,
dividends or distributions of any such Subsidiary to the Company shall be
included in calculating Consolidated Net Income.
 
     "Consolidated Net Tangible Assets" means, for any period, the total amount
of assets (less accumulated depreciation or amortization, allowances for
doubtful receivables, other applicable reserves and other properly deductible
items) as set forth on the most recently available quarterly or annual
consolidated balance sheet of the Company and its Consolidated Subsidiaries,
determined on a consolidated basis in accordance with generally accepted
accounting principles, and after giving effect to purchase accounting and after
deducting therefrom, to the extent otherwise included, the amounts of: (i)
Consolidated Current Liabilities; (ii) minority interests in Consolidated
Subsidiaries held by Persons other than the Company or a Restricted Subsidiary;
(iii) excess of cost over fair value of assets of businesses acquired, as
determined in good faith by the Board of Directors as evidenced by Board
resolutions; (iv) any revaluation or other write-up in value of assets
subsequent to December 31, 1996, as a result of a change in the method of
valuation in accordance with generally accepted accounting principles; (v)
unamortized debt discount and expenses and other unamortized deferred charges,
goodwill, patents, trademarks, service marks, trade names, copyrights, licenses
organization or developmental expenses and other intangible items; (vi) treasury
stock; and (vii) any cash set apart and held in a sinking or other analogous
fund established for the purpose of redemption or other retirement of Capital
Stock to the extent such obligation is not reflected in Consolidated Current
Liabilities.
 
     "Consolidated Net Worth" of any Person means the total of the amounts shown
on the consolidated balance sheet of such Person and its consolidated
subsidiaries, determined on a consolidated basis in accordance with generally
accepted accounting principles, as of any date selected by such Person not more
than 90 days prior to the taking of any action for the purpose of which the
determination is being made (and adjusted for any material events since such
date), as (i) the par or stated value of all outstanding Capital Stock plus (ii)
paid-in capital or capital surplus relating to such Capital Stock plus (iii) any
retained earnings or earned surplus less (A) any accumulated deficit, (B) any
amounts attributable to Redeemable Stock and (C) any amounts attributable to
Exchangeable Stock.
 
                                      S-26
<PAGE>   29
 
     "Consolidated Subsidiary" means, any Subsidiary whose accounts are or are
required to be consolidated with the accounts of the Company in accordance with
generally accepted accounting principles.
 
     "Consumers" means Consumers Energy Company, a Michigan corporation, all of
whose common stock is on the date hereof owned by the Company.
 
     "Designated Enterprises Subsidiary" means any wholly-owned subsidiary of
Enterprises formed after the date of the Supplemental Indenture which is
designated a Designated Enterprises Subsidiary by the Board of Directors.
 
     "Enterprises" means CMS Enterprises Company, a Michigan corporation and
wholly-owned subsidiary of the Company.
 
     "Exchangeable Stock" means any Capital Stock of a corporation that is
exchangeable or convertible into another security (other than Capital Stock of
such corporation that is neither Exchangeable Stock nor Redeemable Stock).
 
     "Holder" means the Person in whose name a Note is registered in the
security register kept by the Company for that purpose.
 
     "Hybrid Preferred Securities" means any preferred securities issued by a
Hybrid Preferred Securities Subsidiary, where such preferred securities have the
following characteristics: (i) such Hybrid Preferred Securities Subsidiary lends
substantially all of the proceeds from the issuance of such preferred securities
to the Company or Consumers in exchange for subordinated debt issued by the
Company or Consumers, respectively; (ii) such preferred securities contain terms
providing for the deferral of distributions corresponding to provisions
providing for the deferral of interest payments on such subordinated debt; and
(iii) the Company or Consumers (as the case may be) makes periodic interest
payments on such subordinated debt, which interest payments are in turn used by
the Hybrid Preferred Securities Subsidiary to make corresponding payments to the
holders of the Hybrid Preferred Securities.
 
     "Hybrid Preferred Securities Subsidiary" means any business trust (or
similar entity) (i) all of the common equity interest of which is owned (either
directly or indirectly through one or more wholly-owned Subsidiaries of the
Company or Consumers) at all times by the Company or Consumers, (ii) that has
been formed for the purpose of issuing Hybrid Preferred Securities and (iii)
substantially all of the assets of which consist at all times solely of
subordinated debt issued by the Company or Consumers (as the case may be) and
payments made from time to time on such subordinated debt.
 
     "Indebtedness" of any Person means, without duplication, (i) the principal
of and premium (if any) in respect of (A) indebtedness of such Person for money
borrowed and (B) indebtedness evidenced by notes, debentures, bonds or other
similar instruments for the payment of which such Person is responsible or
liable; (ii) all Capital Lease Obligations of such Person; (iii) all obligations
of such Person issued or assumed as the deferred purchase price of property, all
conditional sale obligations and all obligations under any title retention
agreement (but excluding trade accounts payable arising in the ordinary course
of business); (iv) all obligations of such Person for the reimbursement of any
obligor on any letter of credit, bankers' acceptance or similar credit
transaction (other than obligations with respect to letters of credit securing
obligations (other than obligations described in clauses (i) through (iii)
above) entered into in the ordinary course of business of such Person to the
extent such letters of credit are not drawn upon or, if and to
 
                                      S-27
<PAGE>   30
 
the extent drawn upon, such drawing is reimbursed no later than the third
Business Day following receipt by such Person of a demand for reimbursement
following payment on the letter of credit); (v) all obligations of the type
referred to in clauses (i) through (iv) of other Persons and all dividends of
other Persons for the payment of which, in either case, such Person is
responsible or liable as obligor, guarantor or otherwise; and (vi) all
obligations of the type referred to in clauses (i) through (v) of other Persons
secured by any Lien on any property or asset of such Person (whether or not such
obligation is assumed by such Person), the amount of such obligation being
deemed to be the lesser of the value of such property or assets or the amount of
the obligation so secured.
 
     "Lien" means any lien, mortgage, pledge, security interest, conditional
sale, title retention agreement or other charge or encumbrance of any kind.
 
     "Net Cash Proceeds" means, (a) with respect to any Asset Sale, the
aggregate proceeds of such Asset Sale including the fair market value (as
determined by the Board of Directors and net of any associated debt and of any
consideration other than Capital Stock received in return) of property other
than cash, received by the Company, net of (i) brokerage commissions and other
fees and expenses (including fees and expenses of counsel and investment
bankers) related to such Asset Sale, (ii) provisions for all taxes (whether or
not such taxes will actually be paid or are payable) as a result of such Asset
Sale without regard to the consolidated results of operations of the Company and
its Restricted Subsidiaries, taken as a whole, (iii) payments made to repay
Indebtedness or any other obligation outstanding at the time of such Asset Sale
that either (A) is secured by a Lien on the property or assets sold or (B) is
required to be paid as a result of such sale and (iv) appropriate amounts to be
provided by the Company or any Restricted Subsidiary of the Company as a reserve
against any liabilities associated with such Asset Sale, including, without
limitation, pension and other post-employment benefit liabilities, liabilities
related to environmental matters and liabilities under any indemnification
obligations associated with such Asset Sale, all as determined in conformity
with generally accepted accounting principles and (b) with respect to any
issuance or sale or contribution in respect of Capital Stock, the aggregate
proceeds of such issuance, sale or contribution, including the fair market value
(as determined by the Board of Directors and net of any associated debt and of
any consideration other than Capital Stock received in return) of property other
than cash, received by the Company, net of attorneys' fees, accountants' fees,
underwriters' or placement agents' fees, discounts or commissions and brokerage,
consultant and other fees incurred in connection with such issuance or sale and
net of taxes paid or payable as a result thereof, provided, however, that if
such fair market value as determined by the Board of Directors of property other
than cash is greater than $25 million, the value thereof shall be based upon an
opinion from an independent nationally recognized firm experienced in the
appraisal or similar review of similar types of transactions.
 
     "Non-Convertible Capital Stock" means, with respect to any corporation, any
non-convertible Capital Stock of such corporation and any Capital Stock of such
corporation convertible solely into non-convertible Capital Stock other than
Preferred Stock of such corporation; provided, however, that Non-Convertible
Capital Stock shall not include any Redeemable Stock or Exchangeable Stock.
 
     "Other Rating Agency" shall mean any one of Duff & Phelps Credit Rating
Co., Fitch Investors Service, L.P. or Moody's Investors Service, Inc., and any
successor to any of these organizations which is a nationally recognized
statistical rating organization.
 
                                      S-28
<PAGE>   31
 
     "Operating Cash Flow" means, for any period, with respect to the Company
and its Consolidated Subsidiaries, the aggregate amount of Consolidated Net
Income after adding thereto Consolidated Interest Expense (adjusted to include
costs recognized on early retirement of debt), income taxes, depreciation
expense, Amortization Expense and any noncash amortization of debt issuance
costs, any nonrecurring, noncash charges to earnings and any negative accretion
recognition.
 
     "Paying Agent" means any person authorized by the Company to pay the
principal of (and premium, if any) or interest on any of the Notes on behalf of
the Company. Initially, the Paying Agent is the Senior Debt Trustee (as defined
in the accompanying base prospectus).
 
     "Preferred Stock" as applied to the Capital Stock of any corporation, means
Capital Stock of any class or classes (however designated) that is preferred as
to the payment of dividends, or as to the distribution of assets upon any
voluntary or involuntary liquidation or dissolution of such corporation, over
shares of Capital Stock of any other class of such corporation; provided that
Hybrid Preferred Securities are not considered Preferred Stock for purposes of
this definition.
 
     "Redeemable Stock" means any Capital Stock that by its terms or otherwise
is required to be redeemed prior to the first anniversary of the stated maturity
of the Outstanding Notes or is redeemable at the option of the holder thereof at
any time prior to the first anniversary of the stated maturity of the
Outstanding Notes.
 
     "Restricted Subsidiary" means any Subsidiary (other than Consumers and its
subsidiaries) of the Company which, as of the date of the Company's most recent
quarterly consolidated balance sheet, constituted at least 10% of the total
Consolidated Assets of the Company and its Consolidated Subsidiaries and any
other Subsidiary which from time to time is designated a Restricted Subsidiary
by the Board of Directors provided that no Subsidiary may be designated a
Restricted Subsidiary if, immediately after giving effect thereto, an Event of
Default or event that, with the lapse of time or giving of notice or both, would
constitute an Event of Default would exist or the Company and its Restricted
Subsidiaries could not incur at least one dollar of additional Indebtedness
pursuant to the first paragraph under "Description of the Notes Limitation on
Consolidated Indebtedness," and (i) any such Subsidiary so designated as a
Restricted Subsidiary must be organized under the laws of the United States or
any State thereof, (ii) more than 80% of the Voting Stock of such Subsidiary
must be owned of record and beneficially by the Company or a Restricted
Subsidiary and (iii) such Restricted Subsidiary must be a Consolidated
Subsidiary.
 
     "Standard & Poor's" shall mean Standard & Poor's Ratings Group, a division
of McGraw Hill Inc., and any successor thereto which is a nationally recognized
statistical rating organization, or if such entity shall cease to rate the Notes
or shall cease to exist and there shall be no such successor thereto, any other
nationally recognized statistical rating organization selected by the Company
which is acceptable to the Senior Debt Trustee.
 
     "Subordinated Indebtedness" means any Indebtedness of the Company (whether
outstanding on the date of the Supplemental Indenture or thereafter incurred)
which is contractually subordinated or junior in right of payment to the Notes.
 
     "Subsidiary" means a corporation more than 50% of the outstanding voting
stock of which is owned, directly or indirectly, by the Company or by one or
more other
 
                                      S-29
<PAGE>   32
 
Subsidiaries, or by the Company and one or more other Subsidiaries. For the
purposes of this definition, "voting stock" means stock which ordinarily has
voting power for the election of directors, whether at all times or only so long
as no senior class of stock has such voting power by reason of any contingency.
 
     "Support Obligations" means, for any person, without duplication, any
financial obligation, contingent or otherwise, of such person guaranteeing or
otherwise supporting any debt or other obligation of any other person in any
manner, whether directly or indirectly, and including, without limitation, any
obligation of such person, direct or indirect, (i) to purchase or pay (or
advance or supply funds for the purchase or payment of) such debt or to purchase
(or to advance or supply funds for the purchase of) any security for the payment
of such debt, (ii) to purchase property, securities or services for the purpose
of assuring the owner of such debt of the payment of such debt, (iii) to
maintain working capital, equity capital, available cash or other financial
statement condition of the primary obligor so as to enable the primary obligor
to pay such debt, (iv) to provide equity capital under or in respect of equity
subscription arrangements (to the extent that such obligation to provide equity
capital does not otherwise constitute debt), or (v) to perform, or arrange for
the performance of, any non-monetary obligations or non-funded debt payment
obligations of the primary obligor.
 
     "Tax-Sharing Agreement" means the Amended and Restated Agreement for the
Allocation of Income Tax Liabilities and Benefits, dated January 1, 1994, as
amended or supplemented from time to time, by and among the Company, each of the
members of the Consolidated Group (as defined therein), and each of the
corporations that become members of the Consolidated Group.
 
     "Voting Stock" means securities of any class or classes the holders of
which are ordinarily, in the absence of contingencies, entitled to vote for
corporate directors (or persons performing similar functions).
 
EVENTS OF DEFAULT
 
     The occurrence of any of the following events with respect to the Notes
will constitute an "Event of Default" with respect to the Notes: (a) default for
30 days in the payment of any interest on any of the Notes; (b) default in the
payment when due of any of the principal of or the premium, if any, on any of
the Notes, whether at maturity, upon redemption, acceleration, purchase by the
Company at the option of the Holders or otherwise; (c) default for 60 days by
the Company in the observance or performance of any other covenant or agreement
contained in the Senior Debt Indenture relating to the Notes after written
notice thereof as provided in the Senior Debt Indenture; (d) certain events of
bankruptcy, insolvency or reorganization relating to the Company or Consumers;
(e) entry of final judgments against the Company or Consumers aggregating in
excess of $25,000,000 which remain undischarged or unbonded for 60 days; or (f)
a default resulting in the acceleration of indebtedness of the Company or
Consumers in excess of $25,000,000, which acceleration has not been rescinded or
annulled within 10 days after written notice of such default as provided in the
Senior Debt Indenture.
 
     If an Event of Default on the Notes shall have occurred and be continuing,
either the Senior Debt Trustee or the Holders of not less than 25% in aggregate
principal amount of the Notes then Outstanding may declare the principal of all
the Notes and the premium thereon and interest, if any, accrued thereon to be
due and payable immediately.
 
                                      S-30
<PAGE>   33
 
     The Senior Debt Indenture provides that the Senior Debt Trustee will be
under no obligation to exercise any of its rights or powers under the Senior
Debt Indenture at the request, order or direction of the Holders of the Notes,
unless such Holders shall have offered to the Senior Debt Trustee reasonable
indemnity. Subject to such provisions for indemnity and certain other
limitations contained in the Senior Debt Indenture, the Holders of a majority in
aggregate principal amount of the Senior Debt Securities of each affected series
then Outstanding (voting as one class) will have the right to direct the time,
method and place of conducting any proceeding for any remedy available to the
Senior Debt Trustee, or exercising any trust or power conferred on the Senior
Debt Trustee, with respect to the Senior Debt Securities of such affected
series.
 
     The Senior Debt Indenture provides that no Holder of Notes may institute
any action against the Company under the Senior Debt Indenture (except actions
for payment of overdue principal, premium or interest) unless such Holder
previously shall have given to the Senior Debt Trustee written notice of default
and continuance thereof and unless the Holders of not less than 25% in aggregate
principal amount of Senior Debt Securities of the affected series then
Outstanding (voting as one class) shall have requested the Senior Debt Trustee
to institute such action and shall have offered the Senior Debt Trustee
reasonable indemnity, the Senior Debt Trustee shall not have instituted such
action within 60 days of such request and the Senior Debt Trustee shall not have
received direction inconsistent with such request by the Holders of a majority
in aggregate principal amount of the Senior Debt Securities of the affected
series then Outstanding (voting as one class).
 
     The Senior Debt Indenture requires the Company to furnish to the Senior
Debt Trustee annually a statement as to the Company's compliance with all
conditions and covenants under the Senior Debt Indenture. The Senior Debt
Indenture provides that the Senior Debt Trustee may withhold notice to the
Holders of the Notes of any default affecting such Notes (except defaults as to
payment of principal, premium or interest on the Notes) if it considers such
withholding to be in the interests of the Holders of the Notes.
 
BOOK-ENTRY SYSTEM
 
     The Notes will be issued initially in the form of one or more Global Notes
that will be deposited with, or on behalf of, DTC, which will act as securities
depository for the Notes. The Notes will be issued as fully-registered
securities registered in the name of Cede & Co. (DTC's nominee). DTC and any
other depository which may replace DTC as depositary for the Notes are sometimes
referred to herein as the "Depositary." Except under the limited circumstances
described below, Notes represented by Global Notes will not be exchangeable for
Certificated Notes.
 
     So long as the Depositary, or its nominee, is the registered owner of a
Global Note, such Depositary or such nominee, as the case may be, will be
considered the sole registered holder of the individual Notes represented by
such Global Note for all purposes under the Senior Debt Indenture. Payments of
principal of and premium, if any, and any interest on individual Notes
represented by a Global Note will be made to the Depositary or its nominee, as
the case may be, as the registered holder of such Global Note. Except as set
forth below, owners of beneficial interests in a Global Note will not be
entitled to have any of the individual Notes represented by such Global Note
registered in their names, will not receive or be entitled to receive physical
delivery of any such Note and will not be considered the registered holder
thereof under the Senior Debt Indenture,
 
                                      S-31
<PAGE>   34
 
including, without limitation, for purposes of consenting to any amendment
thereof or supplement thereto as described in the accompanying Prospectus.
 
     The following is based upon information furnished by DTC:
 
     DTC is a limited-purpose trust company organized under the New York Banking
Law, a "banking organization" within the meaning of the New York Banking Law, a
member of the Federal Reserve System, a "clearing corporation" within the
meaning of the New York Uniform Commercial Code, and a "clearing agency"
registered pursuant to the provisions of Section 17A of the Exchange Act. DTC
holds securities that its participants ("PARTICIPANTS") deposit with DTC. DTC
also facilitates the settlement among Participants of securities transactions,
such as transfers and pledges, in deposited securities through electronic
computerized book-entry changes in Participants' accounts, thereby eliminating
the need for physical movement of securities certificates. Direct Participants
("DIRECT PARTICIPANTS") include securities brokers and dealers, banks, trust
companies, clearing corporations, and certain other organizations. DTC is owned
by a number of its Direct Participants and by the New York Stock Exchange, Inc.,
the American Stock Exchange, Inc., and the NASD. Access to the DTC system is
also available to others such as securities brokers and dealers, banks and trust
companies that clear through or maintain a custodial relationship with a Direct
Participant, either directly or indirectly ("INDIRECT PARTICIPANTS"). The rules
applicable to DTC and its Participants are on file with the Commission.
 
     Purchases of Notes under the DTC system must be made by or through Direct
Participants, which will receive a credit for the Notes on DTC's records. The
ownership interest of each actual purchaser of each Note ("Beneficial Owner") is
in turn to be recorded on the Direct and Indirect Participants' records.
Beneficial Owners will not receive written confirmation from DTC of their
purchase, but Beneficial Owners are expected to receive written confirmations
providing details of the transaction, as well as periodic statements of their
holdings, from the Direct or Indirect Participant through which the Beneficial
Owner entered into the transaction. Transfers of ownership interests in the
Notes are to be accomplished by entries made on the books of Participants acting
on behalf of Beneficial Owners. Beneficial Owners will not receive certificates
representing their ownership interests in Notes, except in the event that use of
the book-entry system for one or more Notes is discontinued.
 
     To facilitate subsequent transfers, all Global Notes deposited by
Participants with DTC are registered in the name of DTC's partnership nominee,
Cede & Co. The deposit of Global Notes with DTC and their registration in the
name of Cede & Co. effect no change in beneficial ownership. DTC has no
knowledge of the actual Beneficial Owners of the Notes; DTC's records reflect
only the identity of the Direct Participants to whose accounts such Notes are
credited, which may or may not be the Beneficial Owners. The Participants will
remain responsible for keeping account of their holdings on behalf of their
customers.
 
     Conveyance of notices and other communications by DTC to Direct
Participants, by Direct Participants to Indirect Participants, and by Direct
Participants and Indirect Participants to Beneficial Owners will be governed by
arrangements among them, subject to any statutory or regulatory requirements as
may be in effect from time to time.
 
     Neither DTC nor Cede & Co. will consent or vote with respect to Notes.
Under its usual procedures, DTC mails an Omnibus Proxy to the Company as soon as
possible after
 
                                      S-32
<PAGE>   35
 
the record date. The Omnibus Proxy assigns Cede & Co.'s consenting or voting
rights to those Direct Participants to whose accounts the Notes are credited on
the record date (identified in a listing attached to the Omnibus Proxy).
 
     Principal and interest payments on the Notes will be made to DTC. DTC's
practice is to credit Direct Participants' accounts on the payable date in
accordance with their respective holdings shown on DTC's records unless DTC has
reason to believe that it will not receive payment on the payable date. Payments
by Participants to Beneficial Owners will be governed by standing instructions
and customary practices, as is the case with securities held for the accounts of
customers in bearer form or registered in "street name" and will be the
responsibility of such Participant and not of DTC, any Agents, or the Company,
subject to any statutory or regulatory requirements as may be in effect from
time to time. Payment of principal and interest to DTC is the responsibility of
the Company, disbursement of such payments to Direct Participants shall be the
responsibility of DTC, and disbursement of such payments to the Beneficial
Owners shall be the responsibility of Direct and Indirect Participants.
 
     DTC may discontinue providing its services as securities depository with
respect to the Notes at any time by giving 90 days' notice to the Company or the
Senior Debt Trustee. Under such circumstances, in the event that a successor
securities depository is not obtained, Certificated Notes are required to be
printed and delivered in exchange for the Notes represented by the Global Notes
held by the DTC. See "Certificated Notes."
 
     In addition, the Company may decide to discontinue use of the system of
book-entry transfers through DTC (or a successor securities depositary). In that
event, Certificated Notes will be printed and delivered in exchange for the
Notes represented by the Global Notes held by DTC. See "Certificated Notes."
 
     The information in this section concerning DTC and DTC's book-entry system
has been obtained from DTC. The Company believes such information to be
reliable, but the Company takes no responsibility for the accuracy thereof.
 
     None of the Company, the Underwriters, the Senior Debt Trustee, any paying
agent or the registrar for the Notes will have any responsibility or liability
for any aspect of the records relating to or payments made on account of
beneficial ownership interests in a Global Note or for maintaining, supervising
or reviewing any records relating to such beneficial ownership interests.
 
CERTIFICATED NOTES
 
     If the Depositary is at any time unwilling or unable to continue as
depositary and a successor depositary is not appointed by the Company by the
earlier of (i) 90 days from the date the Company receives notice to the effect
that the Depositary is unwilling or unable to act, or the Company determines
that the Depositary is unable to act or (ii) the effectiveness of the
Depositary's resignation or failure to fulfill its duties as Depositary, the
Company will issue Certificated Notes in exchange for the Notes represented by
the Global Notes held by the Depositary. Further, within seven days after the
occurrence of an Event of Default described in clauses (a), (b) or (c) under
"Description of Debt Securities--Senior Debt Securities--Events of Default" in
the accompanying base prospectus, the Company will issue Certificated Notes in
exchange for Notes represented by a Global Note. In addition, the Company may at
any time and in its sole discretion determine not to have Notes represented by a
Global Note and, in such event, will issue
 
                                      S-33
<PAGE>   36
 
individual Certificated Notes in exchange for the Notes represented by the
Global Note. In any such instance, the owner of a beneficial interest in a Note
represented by a Global Note will be entitled to have such Notes registered in
its name and will be entitled to physical delivery of such Note in certificated
form. Individual Certificated Notes so issued will be issued in fully registered
form, without coupons, in one or more authorized denominations as described
above under "General."
 
     Certificated Notes will be exchangeable for other Certificated Notes of any
authorized denominations and of a like aggregate principal amount and tenor.
 
     Certificated Notes may be presented for exchange as provided above, and may
be presented for registration of transfer (duly endorsed, or accompanied by a
duly executed written instrument of transfer), at the office of the Senior Debt
Trustee, in Detroit, Michigan (the "SECURITY REGISTRAR"). The Security Registrar
will not charge a service charge for any registration of transfer or exchange of
Notes; however, the Company may require payment by a Holder of a sum sufficient
to cover any tax, assessment or other governmental charge payable in connection
therewith, as described in the Senior Debt Indenture. Such transfer or exchange
will be effected upon the Security Registrar or such other transfer agent, as
the case may be, being satisfied with the documents of title and identity of the
person making the request. The Company may at any time designate additional
transfer agents with respect to the Notes.
 
     The Company shall not be required to (a) issue, exchange or register the
transfer of any Certificated Note for a period of 15 days next preceding the
mailing of notice of redemption of such Note or (b) exchange or register the
transfer of any Certificated Note or portion thereof selected, called or being
called for redemption, except in the case of any Certificated Note to be
redeemed in part, the portion thereof not so to be redeemed.
 
     If a Certificated Note is mutilated, destroyed, lost or stolen, it may be
replaced at the office of the Security Registrar upon payment by the Holder of
such expenses as may be incurred by the Company and the Security Registrar in
connection therewith and the furnishing of such evidence and indemnity as the
Company and the Security Registrar may require. Mutilated Notes must be
surrendered before new Notes will be issued.
 
                                      S-34
<PAGE>   37
 
                                  UNDERWRITING
 
     Under the terms and subject to the conditions contained in an Underwriting
Agreement dated the date hereof (the "UNDERWRITING AGREEMENT"), the underwriters
named below (the "UNDERWRITERS") have severally agreed to purchase, and the
Company has agreed to sell to them, the respective principal amounts of the
Notes set forth opposite their names below:
 
<TABLE>
<CAPTION>
                                                             PRINCIPAL AMOUNT
UNDERWRITERS                                                     OF NOTES
<S>                                                          <C>
  Donaldson, Lufkin & Jenrette Securities Corporation.....     $240,000,000
  Chase Securities Inc. ..................................       84,000,000
  NationsBanc Montgomery Securities LLC...................       84,000,000
  Barclays Capital Inc....................................       72,000,000
                                                               ------------
  Total...................................................     $480,000,000
                                                               ============
</TABLE>
 
     The Underwriting Agreement provides that the obligations of the several
Underwriters to pay for and accept delivery of the Notes are subject to approval
of certain legal matters by their counsel and to certain other conditions. The
Underwriters are obligated to take and pay for all the Notes if any are taken,
provided that, under certain circumstances relating to a default of one or more
Underwriters, less than all of the Notes may be purchased. Default by one or
more Underwriters would not relieve the non-defaulting Underwriters from their
several obligations, and in the event of such default, the Company would have
the right to require the non-defaulting Underwriters to purchase the respective
principal amount of Notes which they have severally agreed to purchase and, in
addition, to purchase Notes which the defaulting Underwriter or Underwriters
shall have so failed to purchase up to a principal amount thereof equal to
one-ninth of the respective principal amounts of Notes which such non-defaulting
Underwriters have otherwise agreed to purchase.
 
     The Underwriters initially propose to offer part of the Notes directly to
the public at the public offering price set forth on the cover page of this
Prospectus Supplement and part to certain dealers at prices that represent
concessions not to exceed 0.250% of the principal amount of the Notes. The
Underwriters may allow, and such dealers may reallow, concessions not to exceed
0.125% of the principal amount of the Notes to certain other dealers. After the
initial offering of the Notes, the offering price and other selling terms may be
varied from time to time by the Underwriters.
 
     The Company has agreed to indemnify the Underwriters against certain
liabilities, including civil liabilities under the Securities Act, or to
contribute to payments which the Underwriters may be required to make in respect
thereof.
 
     Because more than 10% of the proceeds of the offering will be paid to
affiliates of the NASD members who are participating in the offering, the
offering is being made pursuant to the provisions of NASD Conduct Rule
2710(c)(8). Donaldson, Lufkin & Jenrette Securities Corporation ("DLJ") will act
as qualified independent underwriter ("QIU") and assumes the responsibilities of
acting as QIU in pricing the offering and conducting due diligence.
 
     The Notes are a new issue of securities with no established trading market.
The Company does not intend to apply for listing the Notes on any securities
exchange or for quotation through any inter-dealer quotation system. The Company
has been advised by
 
                                      S-35
<PAGE>   38
 
the Underwriters that they presently intend to make a market in the Notes as
permitted by applicable laws and regulations. The Underwriters are not
obligated, however, to make a market in any of the Notes and any such market
making may be discontinued at any time without notice at the discretion of the
Underwriters. No assurances can be given as to the liquidity of, or the trading
market for, the Notes.
 
     In order to facilitate the offering of the Notes, the Underwriters may
engage in transactions that stabilize, maintain or otherwise affect the price of
the Notes. Specifically, the Underwriters may overallot in connection with the
offering, creating a short position in the Notes for their own account. In
addition, to cover overallotments or to stabilize the price of the Notes, the
Underwriters may bid for, and purchase, the Notes in the open market. Finally,
the underwriting syndicate may reclaim selling concessions allowed to an
underwriter or a dealer for distributing the Notes in the offering, if the
syndicate repurchases previously distributed Notes in transactions to cover
syndicate short positions, in stabilization transactions or otherwise. Any of
these activities may stabilize or maintain the market price of the Notes above
independent market levels. The Underwriters are not required to engage in these
activities, and may end any of these activities at any time.
 
     Each of DLJ, Chase Securities Inc., NationsBanc Montgomery Securities LLC
and Barclays Capital Inc and certain of their respective affiliates have
provided, and may continue to provide, investment banking services to the
Company.
 
                                 LEGAL OPINIONS
 
     Opinions as to the legality of the Shares will be rendered for CMS Energy
by Michael D. Van Hemert, Assistant General Counsel for CMS Energy. Certain
legal matters with respect to the Notes will be passed upon by Skadden, Arps,
Slate, Meagher & Flom LLP. As of June 30, 1998, an attorney currently employed
by Skadden, Arps, Slate, Meagher & Flom LLP, and formerly employed by CMS
Energy, owned approximately 50,326 shares of CMS Energy Common Stock, 2,000
shares of Class G Common Stock, options to acquire approximately 142,000 shares
of CMS Energy Common Stock, 10 shares of Consumers $4.50 Series Preferred Stock,
$100 par value, and $50,000 aggregate principal amount of certain debt
securities issued by CMS Energy. As of June 30, 1998, Mr. VanHemert beneficially
owned approximately 2,785 shares of CMS Energy Common Stock.
 
                                    EXPERTS
 
     The consolidated financial statements and schedule of CMS Energy as of
December 31, 1997 and 1996, and for each of the three years in the period ended
December 31, 1997 incorporated by reference in this prospectus supplement, have
been audited by Arthur Andersen LLP, independent public accountants, as
indicated in their reports with respect thereto, and are included herein in
reliance upon the authority of said firm as experts in accounting and auditing
in giving said reports.
 
     With respect to the unaudited interim consolidated financial information
for the periods ended March 31, 1998 and 1997, June 30, 1998 and 1997, and
September 30, 1998 and 1997, Arthur Andersen LLP has applied limited procedures
in accordance with professional standards for a review of such information.
However, their separate reports thereon state that they did not audit and they
did not express an opinion on that interim
 
                                      S-36
<PAGE>   39
 
consolidated financial information. Accordingly, the degree of reliance on their
report on that information should be restricted in light of the limited nature
of the review procedures applied. In addition, the accountants are not subject
to the liability provisions of Section 11 of the Securities Act, for their
reports on the unaudited interim consolidated financial information because
those reports are not a "report" or "part" of the registration statement
prepared or certified by the accountants within the meaning of Sections 7 and 11
of the Securities Act.
 
     Future consolidated financial statements of CMS Energy and the reports
thereon of Arthur Andersen LLP also will be incorporated by reference in this
prospectus supplement in reliance upon the authority of that firm as experts in
giving those reports to the extent that said firm has audited said consolidated
financial statements and consented to the use of their reports thereon.
 
                                      S-37
<PAGE>   40
 
                   UNAUDITED PRO FORMA FINANCIAL INFORMATION
 
               UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS
                           OF CMS ENERGY CORPORATION
 
     The following Unaudited Pro Forma Combined Financial Statements (the "PRO
FORMA FINANCIAL STATEMENTS") of CMS Energy Corporation and its subsidiaries
("CMS ENERGY") illustrate the effects of (i) various restructuring, realignment,
and elimination of activities between Panhandle Eastern Pipe Line Company and
its subsidiaries ("PANHANDLE") and Duke Energy Corporation and its subsidiaries
(collectively "DUKE ENERGY") prior to the closing of the pending acquisition of
the stock of Panhandle and its principal subsidiaries, Trunkline Gas Company and
Pan Gas Storage Company, and the stock of Panhandle Storage Company and
Trunkline LNG Company (collectively the "PANHANDLE COMPANIES") by CMS Energy
(the "ACQUISITION"); (ii) the adjustments resulting from the Acquisition; and
(iii) the Panhandle and CMS Energy financing transactions which will be
completed to facilitate the Acquisition, including the assumed public issuance
of $800 million of senior notes by Panhandle, $500 million of senior debt by CMS
Energy, and approximately 13 million shares of common stock by CMS Energy
aggregating approximately $600 million (collectively, the "FINANCING
TRANSACTIONS"). The net proceeds from the Financing Transactions will be used to
retire bridge facilities of Panhandle and CMS Energy which initially will
finance the Acquisition, in whole or in part. The Unaudited Pro Forma Combined
Balance Sheet has been prepared as if such transactions occurred on September
30, 1998; the Unaudited Pro Forma Combined Statements of Income have been
prepared as if such transactions occurred as of January 1, 1997.
 
     The Pro Forma Financial Statements reflect CMS Energy acquiring all of the
common stock of the Panhandle Companies. The Pro Forma Financial Statements also
reflect, prior to the Acquisition, the transfer of Panhandle's interest in
Northern Border Pipeline Company and certain non-operating assets to other
subsidiaries of Duke Energy, and the elimination of certain intercompany
accounts, including advances, between Panhandle and Duke Energy. The purchase
price for the common stock of the Panhandle Companies is $1.9 billion in cash.
The Panhandle Companies will have approximately $300 million of debt outstanding
at the time of closing which will become a part of CMS Energy's consolidated
indebtedness. CMS Energy's acquisition of the Panhandle Companies will be
accounted for under the purchase method.
 
     A final determination of required purchase accounting adjustments,
including the allocation of the purchase price to the assets acquired and
liabilities assumed based on their respective fair values, has not yet been
made. Accordingly, the purchase accounting adjustments made in connection with
the development of the Pro Forma Financial Statements are preliminary and have
been made solely for purposes of developing the pro forma combined financial
information. However, CMS Energy management believes that the pro forma
adjustments and the underlying assumptions reasonably present the significant
effects of the Acquisition and the Financing Transactions. In addition, CMS
Energy will undertake a study to determine the fair value of assets and
liabilities of the Panhandle Companies and will revise the purchase accounting
adjustments upon completion of that study. Upon consummation of the Acquisition,
the actual financial position and results of operations of the combined entity
will differ, perhaps significantly, from the pro forma amounts reflected herein
because of a variety of factors, including access to additional information,
changes in value and changes in operating results between the dates of the Pro
Forma Financial Statements and the date on which the Acquisition
 
                                       F-1
<PAGE>   41
 
takes place. The Pro Forma Financial Statements are not necessarily indicative
of actual operating results or financial position had the Acquisition and the
Financing Transactions occurred as of the dates indicated above, nor do they
purport to indicate operating results or financial position which may be
attained in the future.
 
     The significant adjustments to the pro forma results of operations reflect
(i) higher depreciation and amortization expense to give effect to the
allocation of excess purchase price and the fair value of net assets acquired to
property, plant and equipment, (ii) elimination of pension and rental income and
(iii) lower interest expense from the cancellation of certain indebtedness
between Panhandle and Duke Energy and additional interest expense reflecting the
new debt issuances of both Panhandle and CMS Energy.
 
     The significant adjustments to the pro forma financial position reflect (i)
elimination of the advances to Duke Energy and the notes payable to Duke Energy,
(ii) increases to property, plant and equipment and accrued liabilities for the
purchase price allocation, (iii) the recognition of goodwill in the fair value
calculation, (iv) decreases in taxes and other liabilities assumed by Duke
Energy, and (v) increases in long-term debt and common stockholders' equity in
connection with the Acquisition and the Financing Transactions.
 
     The Panhandle Companies' financial statements utilized in the preparation
of the Pro Forma Financial Statements are based upon financial statements and
information obtained from Duke Energy and Panhandle.
 
     The Pro Forma Financial Statements should be read in conjunction with the
historical financial statements and notes thereto of CMS Energy and Panhandle,
respectively, and the notes to the Pro Forma Financial Statements included
elsewhere herein. The pro forma adjustments do not reflect any potential
operating efficiencies or cost savings which CMS Energy management believes are
achievable with respect to the combined companies.
 
                                       F-2
<PAGE>   42
 
                             CMS ENERGY CORPORATION
 
                 UNAUDITED PRO FORMA COMBINED INCOME STATEMENT
                  FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1998
                    (IN MILLIONS, EXCEPT PER SHARE AMOUNTS)
<TABLE>
<CAPTION>
                                                             PANHANDLE COMPANIES
                                                               PRE-ACQUISITION                    PRO FORMA ACQUISITION
                                                ---------------------------------------------   --------------------------
                                                 PANHANDLE     RESTRUCTURING   ELIMINATION OF
                                   CMS ENERGY   CONSOLIDATED        AND         DUKE ENERGY     ACQUISITION    FINANCING
                                   HISTORICAL    HISTORICAL     REALIGNMENT      ACTIVITIES     ADJUSTMENTS   TRANSACTIONS
                                   ----------   ------------   -------------   --------------   -----------   ------------
<S>                                <C>          <C>            <C>             <C>              <C>           <C>
Operating revenues................   $3,792         $365            $(8)(a)         $ (9)(b)        $(3)(h)
Operating expenses
  Operations and maintenance......    2,683          154             (3)(a)           10(c)
  Depreciation and amortization...      347           41             (2)(a)           (3)(d)          6(i)
  Property and other taxes........      155           20              1(a)            (1)(e)
                                     ------         ----            ---             ----            ---           ----
                                      3,185          215             (4)               6              6             --
                                     ------         ----            ---             ----            ---           ----
Pretax operating income...........      607          150             (4)             (15)            (9)            --
Other income (deductions).........      (42)          10
Fixed charges.....................      288           58              1(a)           (43)(f)                        71(k)
                                     ------         ----            ---             ----            ---           ----
Income before income taxes........      277          102             (5)              28             (9)           (71)
Income taxes......................       86           38             (1)(a)           10(g)          (3)(j)        (25)(l)
                                     ------         ----            ---             ----            ---           ----
Net income before cumulative
  effect of change in accounting
  principle.......................      191           64             (4)              18             (6)           (46)
Cumulative effect of change in
  accounting for property taxes,
  net of $23 tax..................       43
                                     ------         ----            ---             ----            ---           ----
Net income........................   $  234         $ 64            $(4)            $ 18            $(6)          $(46)
                                     ======         ====            ===             ====            ===           ====
Basic earnings per average common
  share
  CMS Energy......................   $ 2.23
                                     ======
  Class G.........................   $ 1.04
                                     ======
Diluted earnings per average
  common share
  CMS Energy......................   $ 2.19
                                     ======
  Class G.........................   $ 1.04
                                     ======
Average common shares outstanding
  CMS Energy......................      101                                                                         13
                                     ======                                                                       ====
  Class G.........................        8                                                                         --
                                     ======                                                                       ====
 
<CAPTION>
 
                                      PRO FORMA ACQUISITION
                                    -------------------------
 
                                    INTERCOMPANY   CMS ENERGY
                                    ELIMINATIONS   PRO FORMA
                                    ------------   ----------
<S>                                 <C>            <C>
Operating revenues................      $(35)(m)     $4,102
Operating expenses
  Operations and maintenance......       (35)(m)      2,809
  Depreciation and amortization...                      389
  Property and other taxes........                      175
                                        ----         ------
                                         (35)         3,373
                                        ----         ------
Pretax operating income...........        --            729
Other income (deductions).........                      (32)
Fixed charges.....................                      375
                                        ----         ------
Income before income taxes........        --            322
Income taxes......................                      105
                                        ----         ------
Net income before cumulative
  effect of change in accounting
  principle.......................        --            217
Cumulative effect of change in
  accounting for property taxes,
  net of $23 tax..................                       43
                                        ----         ------
Net income........................      $ --         $  260
                                        ====         ======
Basic earnings per average common
  share
  CMS Energy......................                   $ 2.21
                                                     ======
  Class G.........................                   $ 1.04
                                                     ======
Diluted earnings per average
  common share
  CMS Energy......................                   $ 2.18
                                                     ======
  Class G.........................                   $ 1.04
                                                     ======
Average common shares outstanding
  CMS Energy......................                      114
                                                     ======
  Class G.........................                        8
                                                     ======
</TABLE>
 
See accompanying Notes to Unaudited Pro Forma Combined Income Statements.
 
                                       F-3
<PAGE>   43
 
                             CMS ENERGY CORPORATION
 
                 UNAUDITED PRO FORMA COMBINED INCOME STATEMENT
                      FOR THE YEAR ENDED DECEMBER 31, 1997
                    (IN MILLIONS, EXCEPT PER SHARE AMOUNTS)
<TABLE>
<CAPTION>
                                                       PANHANDLE COMPANIES
                                                         PRE-ACQUISITION                    PRO FORMA ACQUISITION
                                          ---------------------------------------------   --------------------------
                                           PANHANDLE     RESTRUCTURING   ELIMINATION OF
                             CMS ENERGY   CONSOLIDATED        AND         DUKE ENERGY     ACQUISITION    FINANCING
                             HISTORICAL    HISTORICAL     REALIGNMENT      ACTIVITIES     ADJUSTMENTS   TRANSACTIONS
                             ----------   ------------   -------------   --------------   -----------   ------------
<S>                          <C>          <C>            <C>             <C>              <C>           <C>
Operating revenues.........    $4,781         $534            $(6)(a)         $(13)(b)       $ (7)(h)
Operating expenses
  Operations and
    maintenance............     3,387          254             (6)(a)          (13)(c)
  Depreciation and
    amortization...........       467           59             (2)(a)           (4)(d)          3(i)
  Property and other
    taxes..................       211           26              1(a)            (1)(e)
                               ------         ----            ---             ----           ----           ----
                                4,065          339             (7)             (18)             3             --
                               ------         ----            ---             ----           ----           ----
Pretax operating income....       716          195              1                5            (10)            --
Other income
  (deductions).............       (12)           6
Fixed charges..............       352           73              2(a)           (50)(f)                        94(k)
                               ------         ----            ---             ----           ----           ----
Income before income
  taxes....................       352          128             (1)              55            (10)           (94)
Income taxes...............       108           48                              19(g)          (4)(j)        (33)(l)
                               ------         ----            ---             ----           ----           ----
Net income.................    $  244         $ 80            $(1)            $ 36           $ (6)          $(61)
                               ======         ====            ===             ====           ====           ====
Basic earnings per average
  common share
  CMS Energy...............    $ 2.39
                               ======
  Class G..................    $ 1.84
                               ======
Diluted earnings per
  average common share
  CMS Energy...............    $ 2.37
                               ======
  Class G..................    $ 1.84
                               ======
Average common shares
  outstanding
  CMS Energy...............        96                                                                         13
                               ======                                                                       ====
  Class G..................         8                                                                         --
                               ======                                                                       ====
 
<CAPTION>
 
                               PRO FORMA ACQUISITION
                             -------------------------
 
                             INTERCOMPANY   CMS ENERGY
                             ELIMINATIONS   PRO FORMA
                             ------------   ----------
<S>                          <C>            <C>
Operating revenues.........      $(53)(m)     $5,236
Operating expenses
  Operations and
    maintenance............       (53)(m)      3,569
  Depreciation and
    amortization...........                      523
  Property and other
    taxes..................                      237
                                 ----         ------
                                  (53)         4,329
                                 ----         ------
Pretax operating income....        --            907
Other income
  (deductions).............                       (6)
Fixed charges..............                      471
                                 ----         ------
Income before income
  taxes....................        --            430
Income taxes...............                      138
                                 ----         ------
Net income.................      $ --         $  292(n)
                                 ====         ======
Basic earnings per average
  common share
  CMS Energy...............                   $ 2.55
                                              ======
  Class G..................                   $ 1.84
                                              ======
Diluted earnings per
  average common share
  CMS Energy...............                   $ 2.54
                                              ======
  Class G..................                   $ 1.84
                                              ======
Average common shares
  outstanding
  CMS Energy...............                      109
                                              ======
  Class G..................                        8
                                              ======
</TABLE>
 
See accompanying Notes to Unaudited Pro Forma Combined Income Statements.
 
                                       F-4
<PAGE>   44
 
                             CMS ENERGY CORPORATION
 
            NOTES TO UNAUDITED PRO FORMA COMBINED INCOME STATEMENTS
 
RESTRUCTURING AND REALIGNMENT:
 
(a)  To reflect the results of operations of Panhandle Storage Company and
     Trunkline LNG Company, both being acquired by CMS Energy, and the transfer
     of Panhandle's interest in Northern Border Pipeline Company and certain
     non-operating assets to other subsidiaries of Duke Energy under the
     provisions of the Stock Purchase Agreement dated as of October 31, 1998
     between CMS Energy and Duke Energy subsidiaries (the "STOCK PURCHASE
     AGREEMENT").
 
ELIMINATION OF DUKE ENERGY ACTIVITIES:
 
(b)  To reflect the elimination of rental income earned by Panhandle on an
     office building, which will be transferred to Duke Energy under the
     provisions of the Stock Purchase Agreement.
 
(c)  To reflect the elimination of pension income recognized by Panhandle on the
     overfunded pension plans of Duke Energy. Under the provisions of the Stock
     Purchase Agreement, Duke Energy will transfer to CMS Energy an amount of
     pension assets equivalent to the Panhandle Companies' liabilities assumed
     by CMS Energy. Also reflects the elimination of certain previously recorded
     litigation expenses. The liability for such litigation will be transferred
     from the Panhandle Companies to Duke Energy under the provisions of the
     Stock Purchase Agreement.
 
(d)  To reflect the elimination of depreciation expense associated with an
     office building and certain other assets, which will be transferred to Duke
     Energy under the provisions of the Stock Purchase Agreement.
 
(e)  To reflect the elimination of ad valorem taxes associated with an office
     building, which will be transferred to Duke Energy under the provisions of
     the Stock Purchase Agreement.
 
(f)  To reflect a reduction in interest expense relating to the settlement of
     certain short-term notes payable to Duke Energy under the provisions of the
     Stock Purchase Agreement.
 
(g)  To reflect the income tax expense effects of pro forma adjustments (b)
     through (f) at an estimated rate of 35%.
 
ACQUISITION ADJUSTMENTS:
 
(h)  To reflect the elimination of non-cash amortization of deferred credits
     associated with a Trunkline LNG Company rate settlement.
 
(i)  To reflect depreciation expense related to the increase in fair value of
     property, plant and equipment prospectively depreciated over a 40-year
     period which approximates the Federal Energy Regulatory Commission
     ("FERC")-approved depreciation rate for the regulated property, plant and
     equipment of the Panhandle Companies. Also, reflects amortization expense
     over a 40-year period of the estimated goodwill recognized in the
     Acquisition.
 
                                       F-5
<PAGE>   45
 
(j)  To reflect the income tax expense effects of pro forma adjustments (h) and
     (i) at an estimated rate of 35%.
 
FINANCING TRANSACTIONS:
 
(k)  To reflect the increase of interest expense relating to the assumed public
     issuance of $800 million of Panhandle senior notes with a weighted average
     coupon of 6.75% and $500 million of CMS Energy senior debt with a coupon of
     7.5%. An increase of  1/8% in interest rates would have the impact of
     increasing total pro forma interest expense by approximately $1.2 million
     and $1.6 million for the nine months ended September 30, 1998 and the year
     ended December 31, 1997, respectively. This adjustment does not include
     non-recurring CMS Energy and Panhandle bridge financing fees of $11 million
     ($7 million after-tax).
 
(l)  To reflect the income tax expense effects of pro forma adjustment (k) at an
     estimated rate of 35%.
 
INTERCOMPANY ELIMINATIONS:
 
(m)  To reflect the elimination of intercompany transactions between CMS Energy
     and the Panhandle Companies.
 
OTHER DISCLOSURE INFORMATION:
 
(n)  Net income for the year ended December 31, 1997, includes the recognition
     of the FERC's approval of Panhandle's rate settlement agreement which
     provided final resolution of refund matters and established prospective
     rates. As a result of the settlement agreement and certain other
     proceedings, Panhandle recognized pretax operating income of $33 million
     ($21 million after-tax). Without this recognition, CMS Energy's 1997 pro
     forma net income, basic earnings per share and diluted earnings per share
     would have been $261 million, $2.36 and $2.35, respectively.
 
                                       F-6
<PAGE>   46
 
                             CMS ENERGY CORPORATION
 
                   UNAUDITED PRO FORMA COMBINED BALANCE SHEET
                            AS OF SEPTEMBER 30, 1998
                                 (IN MILLIONS)
<TABLE>
<CAPTION>
                                                      PANHANDLE COMPANIES
                                                        PRE-ACQUISITION                    PRO FORMA ACQUISITION
                                         ---------------------------------------------   --------------------------
                                          PANHANDLE     RESTRUCTURING   ELIMINATION OF
                            CMS ENERGY   CONSOLIDATED        AND         DUKE ENERGY     ACQUISITION    FINANCING
                            HISTORICAL    HISTORICAL     REALIGNMENT      ACTIVITIES     ADJUSTMENTS   TRANSACTIONS
                            ----------   ------------   -------------   --------------   -----------   ------------
<S>                         <C>          <C>            <C>             <C>              <C>           <C>
          ASSETS
Net property, plant and
  equipment................   $5,270        $  976          $107(a)         $ (73)(b)      $  576(h)
                                                                                              (38)(i)
INVESTMENTS:
  Advances and notes
    receivable--parent.....       --           715           (30)(a)         (685)(c)
  Investments in affiliates
    and other..............    1,952            54           (45)(a)
                              ------        ------          ----            -----          ------        -------
                               1,952           769           (75)            (685)             --             --
                              ------        ------          ----            -----          ------        -------
CURRENT ASSETS:
  Cash and temporary cash
    investments............      101
  Accounts receivable and
    accrued revenue........      457            86            (3)(a)
  Other current assets.....      580            80             1(a)            (6)(d)
                              ------        ------          ----            -----          ------        -------
                               1,138           166            (2)              (6)             --             --
                              ------        ------          ----            -----          ------        -------
Other non-current assets...    1,570            29                             (3)(d)         700(j)
                              ------        ------          ----            -----          ------        -------
        Total assets.......   $9,930        $1,940          $ 30            $(767)         $1,238        $    --
                              ======        ======          ====            =====          ======        =======
STOCKHOLDERS' INVESTMENT AND
LIABILITIES
CAPITALIZATION:
  Common stockholders'
    equity.................   $1,922        $  563          $  5(a)         $ 156(g)       $1,176(k)     $   600(l)
                                                                                                          (1,900)(m)
  Preferred stock of
    subsidiary.............      238
  Trust preferred
    securities.............      393
  Long-term debt...........    4,248           299            (3)(a)            3(c)                       1,300(n)
  Non-current portion of
    capital leases.........       77
                              ------        ------          ----            -----          ------        -------
                               6,878           862             2              159           1,176             --
                              ------        ------          ----            -----          ------        -------
CURRENT LIABILITIES:
  Current portion of
    long-term debt and
    capital leases.........      171
  Notes payable............      302           675                           (675)(e)
  Accounts payable.........      399            49           (44)(a)
  Other current
    liabilities............      456           175            (3)(a)          (66)(f)
                                                                               (9)(d)
                              ------        ------          ----            -----          ------        -------
                               1,328           899           (47)            (750)             --             --
                              ------        ------          ----            -----          ------        -------
NON-CURRENT LIABILITIES:
  Deferred income taxes....      654            73            38(a)          (111)(f)
  Postretirement
    benefits...............      499
  Other non-current
    liabilities............      571           106            37(a)           (65)(b)         100(j)
                                                                                              (38)(i)
                              ------        ------          ----            -----          ------        -------
                               1,724           179            75             (176)             62             --
                              ------        ------          ----            -----          ------        -------
        Total stockholders'
          investment and
          liabilities......   $9,930        $1,940          $ 30            $(767)         $1,238        $    --
                              ======        ======          ====            =====          ======        =======
 
<CAPTION>
 
                               PRO FORMA ACQUISITION
                             -------------------------
 
                             INTERCOMPANY   CMS ENERGY
                             ELIMINATIONS   PRO FORMA
                             ------------   ----------
<S>                          <C>            <C>
          ASSETS
Net property, plant and
  equipment................                  $ 6,818
INVESTMENTS:
  Advances and notes
    receivable--parent.....                       --
  Investments in affiliates
    and other..............                    1,961
                                 ---         -------
                                  --           1,961
                                 ---         -------
CURRENT ASSETS:
  Cash and temporary cash
    investments............                      101
  Accounts receivable and
    accrued revenue........       (4)(o)         536
  Other current assets.....                      655
                                 ---         -------
                                  (4)          1,292
                                 ---         -------
Other non-current assets...                    2,296
                                 ---         -------
        Total assets.......      $(4)        $12,367
                                 ===         =======
STOCKHOLDERS' INVESTMENT AN
LIABILITIES
CAPITALIZATION:
  Common stockholders'
    equity.................                  $ 2,522
  Preferred stock of
    subsidiary.............                      238
  Trust preferred
    securities.............                      393
  Long-term debt...........                    5,847
  Non-current portion of
    capital leases.........                       77
                                 ---         -------
                                  --           9,077
                                 ---         -------
CURRENT LIABILITIES:
  Current portion of
    long-term debt and
    capital leases.........                      171
  Notes payable............                      302
  Accounts payable.........       (4)(o)         400
  Other current
    liabilities............                      553
                                 ---         -------
                                  (4)          1,426
                                 ---         -------
NON-CURRENT LIABILITIES:
  Deferred income taxes....                      654
  Postretirement
    benefits...............                      499
  Other non-current
    liabilities............                      711
                                 ---         -------
                                  --           1,864
                                 ---         -------
        Total stockholders'
          investment and
          liabilities......      $(4)        $12,367
                                 ===         =======
</TABLE>
 
See accompanying Notes to Unaudited Pro Forma Combined Balance Sheet.
 
                                       F-7
<PAGE>   47
 
                             CMS ENERGY CORPORATION
 
              NOTES TO UNAUDITED PRO FORMA COMBINED BALANCE SHEET
 
RESTRUCTURING AND REALIGNMENT:
 
(a)  To reflect the financial position of Panhandle Storage Company and
     Trunkline LNG Company, both being acquired by CMS Energy, and the transfer
     of Panhandle's interest in Northern Border Pipeline Company and certain
     non-operating assets to other subsidiaries of Duke Energy under the
     provisions of the Stock Purchase Agreement.
 
ELIMINATION OF DUKE ENERGY ACTIVITIES:
 
(b)  To reflect the transfer to Duke Energy of certain assets, primarily an
     office building, under the provisions of the Stock Purchase Agreement.
 
(c)  To reflect the settlement of the advances and notes receivable from Duke
     Energy under the provisions of the Stock Purchase Agreement.
 
(d)  To reflect the transfer from the Panhandle Companies to Duke Energy of
     certain environmental and litigation liabilities and the related assets
     under the provisions of the Stock Purchase Agreement.
 
(e)  To reflect the settlement of certain short-term notes payable to Duke
     Energy under the provisions of the Stock Purchase Agreement.
 
(f)  To reflect the transfer from the Panhandle Companies to Duke Energy of all
     tax liabilities under the provisions of the Stock Purchase Agreement.
 
(g)  To reflect the settlement and transfer of certain assets and liabilities
     described in pro forma adjustments (b) through (f).
 
ACQUISITION ADJUSTMENTS:
 
(h)  To reflect the increase in property, plant and equipment of $576 million to
     adjust the historical value of these assets to their estimated fair values.
     The allocation reflects CMS Energy's internal evaluation of the excess
     purchase price and is subject to the completion of a study to determine the
     fair value of the property. Should the study not support such allocation to
     property, plant and equipment, the excess of total purchase price over the
     fair value of the net assets acquired will be reflected as an adjustment to
     the preliminary estimate of goodwill.
 
(i)  To reflect the elimination of deferred credits associated with a Trunkline
     LNG Company rate settlement.
 
(j)  To reflect the preliminary estimated acquisition adjustments under the
     purchase method of accounting to record assets acquired and liabilities
     assumed at estimated fair value for (i) the preliminary estimate of
     goodwill, (ii) the increase of certain other assets, deferred charges and
     regulatory assets, (iii) the assumption of benefit plan obligations by the
     Panhandle Companies previously assumed by Duke Energy, and (iv) the accrual
     of certain obligations of the Panhandle Companies which are expected to be
     paid after completion of the transaction. The following adjustments
 
                                       F-8
<PAGE>   48
 
     reflect CMS Energy management's intended business strategies which may
     differ from the business strategies employed by Duke Energy management
     prior to the Acquisition (dollars in millions):
 
<TABLE>
<S>                                                            <C>
Other assets including goodwill.............................   $700
Other non-current liabilities...............................   $100
</TABLE>
 
(k)  To reflect an increase in common stockholders' equity as a result of the
     Acquisition adjustments (h) through (j).
 
FINANCING TRANSACTIONS:
 
(l)  To reflect the assumed public issuance of approximately 13 million shares
     of common stock of CMS Energy aggregating $600 million. The anticipated net
     proceeds will be used to retire a portion of the indebtedness incurred to
     acquire the Panhandle Companies.
 
(m)  To reflect the payment of $1.9 billion in cash to Duke Energy for the
     acquisition of the Panhandle Companies.
 
(n)  To reflect the assumed public issuance of $800 million of Panhandle senior
     notes and $500 million of CMS Energy senior debt. The anticipated net
     proceeds will be used to retire a portion of the indebtedness incurred to
     acquire the Panhandle Companies.
 
INTERCOMPANY ELIMINATIONS:
 
(o)  To reflect the elimination of intercompany transactions between CMS Energy
     and the Panhandle Companies.
 
                                       F-9
<PAGE>   49
 
                             CMS ENERGY CORPORATION
 
                             SENIOR DEBT SECURITIES
                          SUBORDINATED DEBT SECURITIES
 
                            ------------------------
 
                                  400,000,000
 
     We may offer up to $400,000,000 aggregate principal amount of our unsecured
senior debt securities and our unsecured subordinated debt securities consisting
of debentures, notes and other unsecured evidence of indebtedness, or any
combination of these securities. For each type of securities, the amount, price
and terms will be determined at or prior to the time of sale.
 
     We will provide the specific terms of these securities in an accompanying
prospectus supplement or supplements. You should read this prospectus and the
accompanying prospectus supplement carefully before you invest.
 
     Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
accuracy or adequacy of this prospectus. Any representation to the contrary is a
criminal offense.
 
     We intend to sell these securities through underwriters, dealers, agents or
directly to a limited number of purchasers. The names of, and any securities to
be purchased by or through these parties, the compensation of these parties and
other special terms in connection with the offering and sale of these securities
will be detailed in the related prospectus supplement.
 
     This prospectus may not be used to consummate sales of these securities
unless accompanied by a prospectus supplement.
 
                            ------------------------
 
                The date of this prospectus is January 19, 1999
<PAGE>   50
 
     NO PERSON IS AUTHORIZED IN CONNECTION WITH THE OFFERING MADE HEREBY TO GIVE
ANY INFORMATION OR TO MAKE ANY REPRESENTATION NOT CONTAINED OR INCORPORATED BY
REFERENCE IN THIS PROSPECTUS OR ANY PROSPECTUS SUPPLEMENT, AND ANY INFORMATION
OR REPRESENTATION NOT CONTAINED OR INCORPORATED HEREIN MUST NOT BE RELIED UPON
AS HAVING BEEN AUTHORIZED BY CMS ENERGY OR ANY UNDERWRITER, DEALER OR AGENT.
THIS PROSPECTUS AND ANY PROSPECTUS SUPPLEMENT DO NOT CONSTITUTE AN OFFER TO SELL
OR THE SOLICITATION OF AN OFFER TO BUY ANY SECURITIES OTHER THAN THE SECURITIES
TO WHICH THEY RELATE OR AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO BUY
SUCH SECURITIES IN ANY CIRCUMSTANCES IN WHICH SUCH OFFER OR SOLICITATION IS
UNLAWFUL. NEITHER THE DELIVERY OF THIS PROSPECTUS OR ANY PROSPECTUS SUPPLEMENT
NOR ANY SALE MADE HEREUNDER OR THEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE
ANY IMPLICATION THAT THE INFORMATION CONTAINED OR INCORPORATED HEREIN OR THEREIN
IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE OF SUCH INFORMATION.
 
                             AVAILABLE INFORMATION
 
     CMS Energy Corporation is subject to the informational requirements of the
Securities Exchange Act of 1934, as amended (the "EXCHANGE ACT"), and in
accordance therewith files reports and other information with the Securities and
Exchange Commission (the "COMMISSION"). Information, as of particular dates,
concerning CMS Energy's directors and officers, their remuneration, the
principal holders of CMS Energy's securities and any material interest of such
persons in transactions with CMS Energy is disclosed in proxy statements
distributed to shareholders of CMS Energy and filed with the Commission. Such
reports, proxy statements and other information may be inspected and copied at
the public reference facilities maintained by the Commission at Judiciary Plaza,
450 Fifth Street, N.W., Washington, D.C. 20549, and at the Commission's Regional
Offices located at 5000 West Madison Street, Chicago, Illinois 60661 and at
Seven World Trade Center, 13th Floor, New York, New York 10048. Copies of such
materials can be obtained by mail from the Public Reference Section of the
Commission at 450 Fifth Street, N.W., Washington, D.C. 20549 at prescribed
rates. The Commission also maintains a Web site (http://www.sec.gov) that
contains reports, proxy statements and other information regarding CMS Energy.
The outstanding shares of CMS Energy Common Stock and Class G Common Stock are
listed on the NYSE and reports, proxy statements and other information
concerning CMS Energy may also be inspected and copied at the offices of such
exchange at 20 Broad Street, New York, New York 10005.
 
                                        2
<PAGE>   51
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The following documents filed by CMS Energy (File No. 1-9513) with the
Commission pursuant to the Exchange Act are hereby incorporated by reference in
this prospectus and shall be deemed to be a part hereof:
 
     (1) CMS Energy's Registration Statement on Form 8-B/A dated November 21,
         1996;
 
     (2) CMS Energy's Annual Report on Form 10-K for the year ended December 31,
         1997;
 
     (3) CMS Energy's Quarterly Reports on Form 10-Q for the quarters ended
         March 31, June 30, and September 30, 1998; and
 
     (4) CMS Energy's Current Reports on Form 8-K dated June 23, July 30,
         October 2, and November 3, 1998.
 
     All documents subsequently filed by CMS Energy pursuant to Section 13(a),
13(c), 14 or 15(d) of the Exchange Act and prior to the termination of the
offering made by this prospectus (the "OFFERING") shall be deemed to be
incorporated by reference herein and shall be deemed to be a part hereof from
the date of filing of such documents (such documents, and the documents
enumerated above, being hereinafter referred to as "INCORPORATED DOCUMENTS").
Any statement contained in an Incorporated Document shall be deemed to be
modified or superseded for purposes of this prospectus to the extent that a
statement contained herein or in any other subsequently filed Incorporated
Document modifies or supersedes such statement. Any such statement so modified
or superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this prospectus.
 
     CMS Energy undertakes to provide without charge to each person, including
any beneficial owner, to whom a copy of this prospectus has been delivered, upon
the written or oral request of any such person, a copy of any and all of the
documents referred to above which have been or may be incorporated in this
prospectus by reference, other than exhibits to such documents (unless such
exhibits are specifically incorporated by reference into such documents).
Requests for such copies should be directed to CMS Energy at its principal
executive offices located at Fairlane Plaza South, Suite 1100, 330 Town Center
Drive, Dearborn, Michigan 48126, Attention: Office of the Secretary, telephone:
(313) 436-9200.
 
     Certain information contained in this prospectus summarizes, is based upon,
or refers to information and financial statements contained in one or more
Incorporated Documents; accordingly, such information contained herein is
qualified in its entirety by reference to such documents and should be read in
conjunction therewith.
 
                             CMS ENERGY CORPORATION
 
     CMS Energy Corporation, a Michigan corporation ("CMS ENERGY"), incorporated
in 1987, is the parent holding company of Consumers Energy Company ("CONSUMERS")
and CMS Enterprises Company ("ENTERPRISES"). Consumers, a combination electric
and gas utility company serving in all 68 counties of Michigan's Lower
Peninsula, is the largest subsidiary of CMS Energy. Consumers' customer base
includes a mix of residential, commercial and diversified industrial customers,
the largest segment of which is the automotive industry. Enterprises is engaged
in several domestic and international
 
                                        3
<PAGE>   52
 
energy-related businesses including: (i) oil and gas exploration and production;
(ii) acquisition, development and operation of independent power production
facilities; (iii) energy marketing, services and trading; (iv) storage,
transmission and processing of natural gas; and (v) international energy
distribution.
 
     CMS Energy conducts its principal operations through the following six
business segments: (i) electric utility operations; (ii) gas utility operations;
(iii) oil and gas exploration and production operations; (iv) independent power
production; (v) energy marketing, services and trading; and (vi) storage,
transmission and processing of natural gas. Consumers or Consumers' subsidiaries
are engaged in two segments: electric operations and gas operations. Consumers'
electric and gas businesses are principally regulated utility operations. CMS
Energy and its subsidiaries routinely evaluate, invest in, acquire and divest
energy-related assets and/or companies both domestically and internationally.
Consideration for such transactions may involve the delivery of cash or
securities.
 
     CMS Energy's 1997 consolidated operating revenue was $4.8 billion. This
consolidated operating revenue was derived from its electric utility operations
(approximately 53%), its gas utility operations (approximately 25%), marketing,
services and trading (approximately 14%), independent power production and other
non-utility activities (approximately 4%), gas transmission, storage and
processing activities (approximately 2%), and oil and gas exploration and
production activities (approximately 2%). Consumers' consolidated operations in
the electric and gas utility businesses account for the majority of CMS Energy's
total assets, revenue and income. The unconsolidated share of non-utility
independent power production, gas transmission and storage, marketing services
and trading, and international energy distribution revenue for 1997 was $913
million.
 
     Consumers is a public utility serving gas or electricity to almost six
million of Michigan's nine and a half million residents in Michigan's Lower
Peninsula. Industries in Consumers' service area include automotive, metal,
chemical, food and wood products industries and a diversified group of other
industries. Consumers' 1997 consolidated operating revenue of $3.8 billion was
derived approximately 67% from its electric utility business, approximately 32%
from its gas utility business and approximately 1% from its non-utility
business. Consumers' rates and certain other aspects of its business are subject
to the jurisdiction of the Michigan Public Service Commission (the "MPSC") and
the Federal Energy Regulatory Commission. Consumers' nuclear operations are
subject to the jurisdiction of the Nuclear Regulatory Commission.
 
     CMS Energy and its subsidiaries routinely evaluate, invest in, acquire and
divest energy-related assets and/or businesses both domestically and
internationally. Consideration for such transactions may involve the delivery of
cash or securities.
 
     The foregoing information concerning CMS Energy and it subsidiaries does
not purport to be comprehensive. For additional information concerning CMS
Energy and its subsidiaries' business and affairs, including their capital
requirements and external financing plans, pending legal and regulatory
proceedings and descriptions of certain laws and regulations to which those
companies are subject, prospective purchasers should refer to the Incorporated
Documents. See "Incorporation of Certain Documents by Reference" and "Available
Information" above.
 
                                        4
<PAGE>   53
 
     The address of the principal executive offices of CMS Energy is Fairlane
Plaza South, 330 Town Center Drive, Suite 1100, Dearborn, Michigan 48126. Its
telephone number is (313) 436-9200.
 
                                USE OF PROCEEDS
 
     As will be more specifically set forth in the applicable prospectus
supplement, CMS Energy will use the net proceeds received from the sale of the
unsecured senior or subordinated debt securities offered for its general
corporate purposes, including capital expenditures, investment in subsidiaries,
working capital and repayment of debt.
 
                       RATIO OF EARNINGS TO FIXED CHARGES
 
     The ratios of earnings to fixed charges for each of the years ended
December 31, 1993 through 1997, and for the nine months ended September 30,
1998, are as follows:
 
<TABLE>
<CAPTION>
                                             YEAR ENDED DECEMBER 31              NINE MONTHS
                                      ------------------------------------          ENDED
                                      1993    1994    1995    1996    1997    SEPTEMBER 30, 1998
                                      ----    ----    ----    ----    ----    ------------------
                                                                                 (UNAUDITED)
<S>                                   <C>     <C>     <C>     <C>     <C>     <C>
Ratio of earnings to fixed
  charges.........................    1.75    2.07    1.90    1.96    1.78           1.68
</TABLE>
 
     For the purpose of computing such ratios, earnings represent net income
before income taxes, net interest charges and the estimated interest portion of
lease rentals.
 
                                        5
<PAGE>   54
 
                         DESCRIPTION OF DEBT SECURITIES
 
     The unsecured senior debt securities ("SENIOR DEBT SECURITIES") will be
issued under an Indenture dated as of September 15, 1992, as amended and
supplemented (the "SENIOR DEBT INDENTURE"), between CMS Energy and NBD Bank, as
Trustee (the "SENIOR DEBT TRUSTEE"), and the unsecured subordinated debt
securities ("SUBORDINATED DEBT SECURITIES") will be issued under an Indenture
dated as of June 1, 1997, as amended and supplemented (the "SUBORDINATED DEBT
INDENTURE"), between CMS Energy and The Bank of New Yorks Trustee (the
"SUBORDINATED DEBT TRUSTEE"). The descriptions of the provisions of the Senior
Debt Securities and the Subordinated Debt Securities (together the "DEBT
SECURITIES" or "OFFERED SECURITIES"), the Senior Debt Indenture and the
Subordinated Debt Indenture contained herein are brief summaries of such
provisions and do not purport to be complete. The forms of the Senior Debt
Indenture and the Subordinated Debt Indenture are filed as exhibits to the
Registration Statement of which this prospectus is a part, and reference is made
thereto for the respective definitive provisions of such Indentures. The
descriptions herein are qualified in their entirety by such reference. Certain
capitalized terms used herein shall have the meanings respectively set forth in
the respective Indentures. Section references below are references to sections
of the respective Senior Debt Indenture and Subordinated Debt Indenture.
 
     Specific terms of the particular unsecured senior or subordinated debt
securities in respect of which this prospectus is being delivered, will be set
forth in an accompanying prospectus supplement or supplements, together with the
terms of the offering of the unsecured senior or subordinated debt securities,
the initial price thereof and the net proceeds from the sale thereof. Each
prospectus supplement will set forth with regard to the particular unsecured
senior or subordinated debt securities, without limitation, the designation,
aggregate principal amount, denomination, maturity, any exchange, conversion,
redemption or sinking fund provisions, provisions for redemption at the option
of the holder, interest rate (which may be fixed or variable), the time and
method of calculating interest payments, the right of CMS Energy, if any, to
defer payment of interest on the unsecured senior or subordinated debt
securities and the maximum length of such deferral period, any listing on a
securities exchange and other specific terms of the offering.
 
GENERAL
 
     CMS Energy will offer under this prospectus unsecured Debt Securities, any
of which may be issued as: (a) Senior Debt Securities or (b) Subordinated Debt
Securities. The terms of any Debt Securities may or may not restrict the
issuance by CMS Energy or its subsidiaries of additional indebtedness which is
secured, unsecured, senior, pari passu or subordinated to such Debt Securities.
 
     CMS Energy is a holding company and its assets consist primarily of
investments in its subsidiaries. The Debt Securities will be obligations
exclusively of CMS Energy. CMS Energy's ability to service its indebtedness,
including the Debt Securities, is dependent primarily upon the earnings of its
subsidiaries and the distribution or other payment of such earnings to CMS
Energy in the form of dividends, loans or advances, and repayment of loans and
advances from CMS Energy. The subsidiaries are separate and distinct legal
entities and have no obligation, contingent or otherwise, to pay any amounts due
pursuant to the Debt Securities or to make any funds available therefor, whether
by dividends, loans or other payments.
 
                                        6
<PAGE>   55
 
     A substantial portion of the consolidated liabilities of CMS Energy have
been incurred by its subsidiaries. Therefore, CMS Energy's rights and the rights
of its creditors, including holders of Debt Securities, to participate in the
distribution of assets of any subsidiary upon the latter's liquidation or
reorganization will be subject to prior claims of the subsidiary's creditors,
including trade creditors, except to the extent that CMS Energy may itself be a
creditor with recognized claims against the subsidiary (in which case the claims
of CMS Energy would still be subject to the prior claims of any secured creditor
of such subsidiary and of any holder of indebtedness of such subsidiary that is
senior to that held by CMS Energy).
 
     As of September 30, 1998, CMS Energy had outstanding approximately $2,321
million aggregate principal amount of indebtedness, none of which was secured.
None of such indebtedness would be senior to any Senior Debt Securities which
may be issued. All of such indebtedness would be senior to any Subordinated Debt
Securities which may be issued. The Indenture, as supplemented, pursuant to
which the Senior Debt Securities will be issued, contains certain limitations on
the issuance of additional debt by CMS Energy, but indebtedness issued within
such limitations could be secured and therefore senior to unsecured Senior Debt
Securities. The Indenture pursuant to which the Subordinated Debt Securities
will be issued contains no limitation on the issuance of indebtedness ranking
senior to the Subordinated Debt Securities.
 
     The applicable prospectus supplement will set forth the following terms
relating to the Offered Securities:
 
      (1) The specific designation of the Offered Securities and whether such
          Offered Securities are Senior Debt Securities or Subordinated Debt
          Securities;
 
      (2) Any limit on the aggregate principal amount of the Offered Securities;
 
      (3) The date or dates, if any (and whether fixed or extendible), on which
          the Offered Securities will mature;
 
      (4) The rate or rates per annum (which may be fixed or variable) at which
          the Offered Securities will bear interest, if any, the date or dates
          on which any such interest will be payable and the regular record
          dates for any interest payable on the Offered Securities;
 
      (5) The place or places where the principal of and any interest on the
          Offered Securities shall be payable and where such Offered Securities
          may be surrendered for registration of transfer or exchange;
 
      (6) Any provisions relating to the issuance of the Offered Securities at
          an original issue discount;
 
      (7) The option, if any, of CMS Energy to redeem the Offered Securities and
          the periods within which or the dates on which, the prices at which
          and the terms and conditions upon which, such Offered Securities may
          be redeemed, in whole or in part, upon the exercise of such option;
 
      (8) The obligation, if any, of CMS Energy to redeem such Offered
          Securities pursuant to any sinking fund or other mandatory redemption
          provisions or at the option of the holder and the periods within which
          or the dates on which, the prices at which the terms and the terms and
          conditions upon which such Offered Securities will be redeemed, in
          whole or in part, pursuant to such obligation;
 
                                        7
<PAGE>   56
 
      (9) The denominations in which such Offered Securities will be issued and
          whether the Offered Securities will be issuable in registered form or
          bearer form or both, and, if issuable in bearer form, the restrictions
          as to the offer, sale and delivery of the Offered Securities in bearer
          form and as to the exchanges between registered and bearer form;
 
     (10) Whether the Offered Securities will be issuable in the form of one or
          more temporary or permanent global securities and, if so, the identity
          of the depository for such global securities;
 
     (11) Whether and under what circumstances CMS Energy will pay additional
          amounts with respect to the Offered Securities to a non-United States
          person (as defined in such prospectus supplement) on account of any
          tax, assessment or governmental charge withheld or deducted and, if
          so, whether CMS Energy will have the option to redeem such Offered
          Securities rather than pay such additional amounts; and
 
     (12) Any other terms of the Offered Securities not inconsistent with the
          related Indenture, including covenants and events of default relating
          solely to the Offered Securities.
 
     Debt Securities may be issued at a substantial discount from the stated
principal amount thereof ("ORIGINAL ISSUE DISCOUNT SECURITIES"). United States
federal income tax consequences and other special considerations applicable
thereto or to other Offered Securities offered and sold at par which are treated
as having been issued at a discount for United States federal income tax
purposes will be described in the prospectus supplement relating thereto.
 
CONCERNING THE TRUSTEES
 
     Each of NBD Bank, the Trustee under the Senior Debt Indenture, and The Bank
of New York, the Trustee under the Subordinated Debt Indenture, is one of a
number of banks with which CMS Energy and its subsidiaries maintain ordinary
banking relationships, including credit facilities.
 
SENIOR DEBT SECURITIES
 
     General. The Senior Debt Securities will be issuable under the Senior Debt
Indenture. The Senior Debt Indenture does not limit the aggregate principal
amount of Senior Debt Securities which may be issued thereunder. Senior Debt
Securities may be issued under the Senior Debt Indenture from time to time in
one or more series. The Senior Debt Securities shall mature on a date not less
than nine month, or more than 40 years after the date of issuance. Capitalized
terms used in this section "Senior Debt Securities" and not otherwise
specifically defined in this prospectus shall have the meanings respectively set
forth in the Senior Debt Indenture.
 
     Exchange and Transfer. Senior Debt Securities may be presented for exchange
and registered Senior Debt Securities may be presented for registration of
transfer at the offices and subject to the restrictions set forth therein and in
the applicable prospectus supplement without service charge, but upon payment of
any taxes or other governmental charges due in connection therewith, subject to
any applicable limitations contained in the Senior Debt
 
                                        8
<PAGE>   57
 
Indenture. Senior Debt Securities in bearer form and the coupons appertaining
thereto, if any, will be transferable by delivery.
 
     Payment. Unless otherwise indicated in the applicable prospectus
supplement, payment of the principal of and the premium and interest, if any, on
all Senior Debt Securities in registered form will be made at the office or
agency of the Senior Debt Trustee in the Borough of Manhattan, the City of New
York, except that, at the option of CMS Energy, payment of any interest may be
made (i) by check mailed to the address of the Person entitled thereto as such
address shall appear in the Security Register or (ii) by wire transfer to an
account maintained by the Person entitled thereto as specified in the Security
Register. Unless otherwise indicated in the applicable prospectus supplement,
payment of any interest due on Senior Debt Securities in registered form will be
made to the Persons in whose name such Senior Debt Securities are registered at
the close of business on the Record Date for such interest payments.
 
     Events of Default. The occurrence of any of the following events with
respect to the Senior Debt Securities of any series will constitute an "Event of
Default" with respect to the Senior Debt Securities of such series: (a) default
for 30 days in the payment of any interest on any of the Senior Debt Securities
of such series; (b) default in the payment when due of any of the principal of
or the premium, if any, on any of the Senior Debt Securities of such series,
whether at maturity, upon redemption, acceleration or otherwise; (c) default in
the deposit or payment of any sinking fund or analogous payment in respect of
any Senior Debt Securities of such series; (d) default for 60 days by CMS Energy
in the observance or performance of any other covenant or agreement contained in
the Senior Debt Indenture relating to the Senior Debt Securities of such series
after written notice thereof as provided in the Senior Debt Indenture; (e)
certain events of bankruptcy, insolvency or reorganization relating to CMS
Energy or Consumers; (f) entry of final judgments against CMS Energy or
Consumers aggregating in excess of $25,000,000 which remain undischarged or
unbonded for 60 days; or (g) a default resulting in the acceleration of
indebtedness of CMS Energy or Consumers in excess of $25,000,000, which
acceleration has not been rescinded or annulled within 10 days after written
notice of such default as provided in the Senior Debt Indenture. Additional
Events of Default may be prescribed for the benefit of the Holders of a
particular series of Senior Debt Securities and will be described in the
prospectus supplement relating to such Senior Debt Securities.
 
     If an Event of Default on any series of Senior Debt Securities shall have
occurred and be continuing, either the Senior Debt Trustee or the Holders of not
less than 25% in aggregate principal amount of the Senior Debt Securities of
such series then Outstanding may declare the principal of all Senior Debt
Securities of such series and the premium thereon and interest, if any, accrued
thereon to be due and payable immediately.
 
     Upon certain conditions, any such declarations may be rescinded and
annulled if all Events of Default, other than the nonpayment of accelerated
principal, with respect to the Senior Debt Securities of all such affected
series then Outstanding shall have been cured or waived as provided in the
Senior Debt Indenture by the Holders of a majority in aggregate principal amount
of the Senior Debt Securities of the affected series then Outstanding.
 
     Reference is made to the prospectus supplement relating to any series of
Original Issue Discount Securities for the particular provisions relating to the
acceleration of a portion of the principal amount thereof upon the occurrence
and continuance of an Event of Default with respect thereto.
 
                                        9
<PAGE>   58
 
     The Senior Debt Indenture provides that the Senior Debt Trustee will be
under no obligation to exercise any of its rights or powers under the Senior
Debt Indenture at the request, order or direction of the Holders of the Senior
Debt Securities, unless such Holders shall have offered to the Senior Debt
Trustee reasonable indemnity. Subject to such provisions for indemnity and
certain other limitations contained in the Senior Debt Indenture, the Holders of
a majority in aggregate principal amount of the Senior Debt Securities of each
affected series then Outstanding (voting as one class) will have the right to
direct the time, method and place of conducting any proceeding for any remedy
available to the Senior Debt Trustee, or exercising any trust or power conferred
on the Senior Debt Trustee, with respect to the Senior Debt Securities of such
affected series.
 
     The Senior Debt Indenture provides that no Holder of Senior Debt Securities
may institute any action against CMS Energy under the Senior Debt Indenture
(except actions for payment of overdue principal, premium or interest) unless
such Holder previously shall have given to the Senior Debt Trustee written
notice of default and continuance thereof and unless the Holders of not less
than 25% in aggregate principal amount of Senior Debt Securities of the affected
series then Outstanding (voting as one class) shall have requested the Senior
Debt Trustee to institute such action and shall have offered the Senior Debt
Trustee reasonable indemnity, the Senior Debt Trustee shall not have instituted
such action within 60 days of such request and the Senior Debt Trustee shall not
have received direction inconsistent with such request by the Holders of a
majority in aggregate principal amount of the Senior Debt Securities of the
affected series then Outstanding (voting as one class).
 
     The Senior Debt Indenture requires CMS Energy to furnish to the Senior Debt
Trustee annually a statement as to CMS Energy's compliance with all conditions
and covenants under the Senior Debt Indenture. The Senior Debt Indenture
provides that the Senior Debt Trustee may withhold notice to the Holders of the
Senior Debt Securities of any series of any default affecting such series
(except defaults as to payment of principal, premium of interest on the Senior
Debt Securities of such series) if it considers such withholding to be in the
interests of the Holders of the Senior Debt Securities of such series.
 
     Consolidation, Merger or Sale of Assets. The Senior Debt Indenture provides
that CMS Energy may consolidate with or merge into, or sell, lease or convey its
property as an entirety or substantially as an entirety to, any other
corporation if such corporation assumes the obligations of CMS Energy under the
Senior Debt Securities and the Senior Debt Indenture and is organized and
existing under the laws of the United States of America, any state thereof or
the District of Columbia.
 
     Modification of the Senior Debt Indenture. The Senior Debt Indenture
permits CMS Energy and the Senior Debt Trustee to enter into supplemental
indentures thereto without the consent of the Holders of the Senior Debt
Securities to:
 
     (A) Secure the Senior Debt Securities of one or more series;
 
     (B) Evidence the assumption by a successor corporation of the obligations
         of CMS Energy under the Senior Debt Indenture and the Senior Debt
         Securities then Outstanding;
 
     (C) Add covenants for the protection of the Holders of the Senior Debt
         Securities;
 
                                       10
<PAGE>   59
 
     (D) Cure any ambiguity or correct any defect or inconsistency in the Senior
         Debt Indenture or to make such other provisions as CMS Energy deems
         necessary or desirable with respect to matters or questions arising
         under the Senior Debt Indenture, provided that no such action adversely
         affects the interests of any Holders of Senior Debt Securities;
 
     (E) Establish the form and terms of any series of securities under the
         Senior Debt Indenture; and
 
     (F) Evidence the acceptance of appointment by a successor Senior Debt
         Trustee.
 
     The Senior Debt Indenture also permits CMS Energy and the Senior Debt
Trustee, with the consent of the Holders of not less than a majority in
aggregate principal amount of the Senior Debt Securities of all series then
Outstanding and affected (voting as one class), to enter into supplemental
indentures to add any provisions to, or change in any matter or eliminate any of
the provisions of, the Senior Debt Indenture or modify in any manner the rights
of the Holders of the Senior Debt Securities of each such affected series;
provided, however, that CMS Energy and the Senior Debt Trustee may not, without
the consent of the Holder of each Senior Debt Security then outstanding and
affected thereby, enter into any supplemental indenture to:
 
     (A) Change the time of payment of the principal (or any installment of
         principal) of any Senior Debt Security, or reduce the principal amount
         thereof, or reduce the rate or change the time of payment of interest
         thereon, or reduce the amount payable on any Original Issue Discount
         Securities upon acceleration or provable in bankruptcy, or impair the
         right to institute suit for the enforcement of any payment on any
         Senior Debt Security when due; or
 
     (B) Reduce the percentage in principal amount of the Senior Debt Securities
         of the affected series, the consent of whose Holders is required for
         any such modification or for any waiver provided for in the Senior Debt
         Indenture.
 
     Prior to the acceleration of the maturity of any Senior Debt Security, the
Holders (voting as one class) of a majority in aggregate principal amount of the
Senior Debt Securities of all series at the time Outstanding with respect to
which a default or an Event of Default shall have occurred and be continuing may
on behalf of the Holders of all such affected Senior Debt Securities waive any
past default or Event of Default and its consequences, except a default or an
Event of Default in respect of a covenant or provision of the Senior Debt
Indenture or of any Senior Debt Security which cannot be modified or amended
without the consent of the Holder of each Senior Debt Security affected.
 
     Defeasance, Covenant Defeasance and Discharge. The Senior Debt Indenture
provides that, at the option of CMS Energy: (a) CMS Energy will be discharged
from any and all obligations in respect of the Senior Debt Securities of a
particular series then Outstanding (except for certain obligations to register
the transfer of or exchange the Senior Debt Securities of such series, to
replace stolen, lost or mutilated Senior Debt Securities of such series, to
maintain paying agencies and to maintain the trust described below); or (b) CMS
Energy need not comply with certain restrictive covenants of the Senior Debt
Indenture (including those described under "Consolidation, Merger or Sale of
Assets"), in each case if CMS Energy irrevocably deposits in trust with the
Senior Debt Trustee money, and/or securities backed by the full faith and credit
of the United States which, through the payment of the principal thereof and the
interest thereon in accordance with their terms, will provide money in an amount
sufficient to pay all the principal of and
 
                                       11
<PAGE>   60
 
premium, if any, and interest on the Senior Debt Securities of such series on
the stated maturity of such Senior Debt Securities (which may include one or
more redemption dates designated by CMS Energy) in accordance with the terms
thereof. To exercise such option, CMS Energy is required, among other things, to
deliver to the Senior Debt Trustee an opinion of independent counsel to the
effect that the exercise of such option would not cause the Holders of the
Senior Debt Securities of such series to recognize income, gain or loss for
United States federal income tax purposes as a result of such defeasance, and
such Holders will be subject to United States federal income tax on the same
amounts, in the same manner and at the same times as would have been the case if
such defeasance had not occurred, and, in the case of a discharge as described
in clause (a) of the preceding sentence, such opinion is to be accompanied by a
private letter ruling to the same effect received from the Internal Revenue
Service, a revenue ruling to such effect pertaining to a comparable form of
transaction published by the Internal Revenue Service or appropriate evidence
that since the date of the Senior Debt Indenture there has been a change in the
applicable federal income tax law.
 
     In the event CMS Energy exercises its option to effect a covenant
defeasance with respect to the Senior Debt Securities of any series as described
in the preceding paragraph and the Senior Debt Securities of such series are
thereafter declared due and payable because of the occurrence of any Event of
Default other than an Event of Default caused by failing to comply with the
covenants which are defeased, and the amount of money and securities on deposit
with the Senior Debt Trustee would be insufficient to pay amounts due on the
Senior Debt Securities of such series at the time of the acceleration resulting
from such Event of Default, CMS Energy would remain liable for such amounts.
 
     CMS Energy may also obtain a discharge of the Senior Debt Indenture with
respect to all Senior Debt Securities then Outstanding (except for certain
obligations to register the transfer of or exchange such Senior Debt Securities,
to replace stole, lost or mutilated Senior Debt Securities, to maintain paying
agencies and to maintain the trust described below) by irrevocably depositing in
trust with the Senior Debt Trustee money, and/or securities backed by the full
faith and credit of the United States which, through the payment of the
principal thereof and the interest thereon in accordance with their terms, will
provide money in an amount sufficient to pay all the principal of and premium,
if any, and interest on the Senior Debt Securities on the stated maturities
thereof (including one or more redemption dates), provided that such Senior Debt
Securities are by their terms due and payable, or are to be called for
redemption, within one year.
 
     For United States federal income tax purposes any deposit contemplated in
the preceding paragraph would be treated as an exchange of the Senior Debt
Securities outstanding for other property. Accordingly, Holders of Senior Debt
Securities outstanding may be required to recognize a gain or loss for United
States federal income tax purposes upon such exchange. In addition, such Holders
thereafter may be required to recognize income from such property which could be
different from the amount that would be includable in the absence of such
deposit. Prospective investors are urged to consult their own tax advisors as to
the specific consequences to them of such deposit.
 
     Governing Law. The Senior Debt Indenture and Senior Debt Securities will be
governed by, and construed in accordance with, the laws of the State of Michigan
unless the laws of another jurisdiction shall mandatorily apply.
 
                                       12
<PAGE>   61
 
SUBORDINATED DEBT SECURITIES
 
     General. The Subordinated Debt Securities will be issuable under the
Subordinated Debt Indenture. The Subordinated Debt Indenture does not limit the
aggregate principal amount of Subordinated Debt Securities which may be issued
thereunder. Subordinated Debt Securities may be issued under the Subordinated
Debt Indenture from time to time in one or more series. The Subordinated Debt
Securities shall mature on a date not less than nine months nor more than 40
years after the date of issuance. Capitalized terms used in this section
"Subordinated Debt Securities" and not otherwise specifically defined in this
prospectus shall have the meanings respectively set forth in the Subordinated
Debt Indenture.
 
     Exchange and Transfer. Subordinated Debt Securities may be presented for
exchange and registered Subordinated Debt Securities may be presented for
registration of transfer at the offices and subject to the restrictions set
forth therein and in the applicable prospectus supplement without service
charge, but upon payment of any taxes or other governmental charges due in
connection therewith, subject to any applicable limitations contained in the
Subordinated Debt Indenture. Subordinated Debt Securities in bearer form and the
coupons appertaining thereto, if any, will be transferable by delivery.
 
     Payment. Unless otherwise indicated in the applicable prospectus
supplement, payment of the principal of and the premium and interest, if any, on
all Subordinated Debt Securities in registered form will be made at the office
or agency of the Subordinated Debt Trustee in the City of New York, except that,
at the option of CMS Energy, payment of any interest may be made (i) by check
mailed to the address of the Person entitled thereto as such address shall
appear in the Security Register or (ii) by wire transfer to an account
maintained by the Person entitled thereto as specified in the Security Register.
Unless otherwise indicated in the applicable prospectus supplement, payment of
any interest due on Subordinated Debt Securities in registered form will be made
to the Persons in whose name such Subordinated Debt Securities are registered at
the close of business on the Record Date for such interest payments.
 
     Events of Default. The occurrence of any of the following events with
respect to the Subordinated Debt Securities of any series will constitute an
"Event of Default" with respect to the Subordinated Debt Securities of such
series:
 
     (A) Default for 30 days in the payment of any interest on any of the
         Subordinated Debt Securities of such series (whether or not payment is
         prohibited by the subordination provisions of the Subordinated Debt
         Indenture); provided, however, that if CMS Energy is permitted by the
         terms of the Subordinated Debt Securities of the applicable series to
         defer the payment in question, the date on which such payment is due
         and payable shall be the date on which CMS Energy is required to make
         payment following such deferral, if such deferral has been elected
         pursuant to the terms of the Subordinated Debt Securities;
 
     (B) Default in the payment when due of any of the principal of or the
         premium, if any, on any of the Subordinated Debt Securities of such
         series, whether at maturity, upon redemption, acceleration or otherwise
         (whether or not payment is prohibited by the subordination provision of
         the Subordinated Debt Indenture); provided, however, that if CMS Energy
         is permitted by the terms of the Subordinated Debt Securities of the
         applicable series to defer the payment in
 
                                       13
<PAGE>   62
         question, the date on which such payment is due and payable shall be
         the date on which CMS Energy is required to make payment following such
         deferral, if such deferral has been elected pursuant to the terms of
         the Subordinated Debt Securities;
 
     (C) Default in the deposit or payment of any sinking fund or analogous
         payment in respect if any Subordinated Debt Securities of such series
         (whether or not payment is prohibited by the subordination provisions
         of the Subordinated Debt Indenture);
 
     (D) Default for 60 days by CMS Energy in the observance or performance of
         any other covenant or agreement contained in the Subordinated Debt
         Indenture relating to the Subordinated Debt Securities of such series
         after written notice thereof as provided in the Subordinated Debt
         Indenture;
 
     (E) Certain events of bankruptcy, insolvency or reorganization relating to
         CMS Energy;
 
     (F) Entry of final judgments against CMS Energy or Consumers Energy
         aggregating in excess of $25,000,000 which remain undischarged or
         unbonded for 60 days; or
 
     (G) A default resulting in the acceleration of indebtedness of CMS Energy
         in excess of $25,000,000 which acceleration has not been rescinded or
         annulled within 10 days after written notice of such default as
         provided in the Subordinated Debt Indenture.
 
     Additional Events of Default may be prescribed for the benefit of the
Holders of a particular series of Subordinated Debt Securities and will be
described in the prospectus supplement relating to such Subordinated Debt
Securities.
 
     If any Event of Default on any series of Subordinated Debt Securities shall
have occurred and be continuing, either the Subordinated Debt Trustee or the
Holders of not less than 25% in aggregate principal amount of the Subordinated
Debt Securities of such series then Outstanding may declare the principal of all
Subordinated Debt Securities of such series and the interest, if any, accrued
thereon to be due and payable immediately.
 
     Upon certain conditions, any such declarations may be rescinded and
annulled if all Events of Default, other than the nonpayment of accelerated
principal, with respect to the Subordinated Debt Securities of all such affected
series then Outstanding shall have been cured or waived as provided in the
Subordinated Debt Indenture by the Holders of a majority in aggregate principal
amount of the Subordinated Debt Securities of the affected series then
Outstanding.
 
     Reference is made to the prospectus supplement relating to any series of
Original Issue Discount Securities for the particular provisions relating to the
acceleration of a portion of the principal amount thereof upon the occurrence
and continuance of an Event of Default with respect thereto.
 
     The Subordinated Debt Indenture provides that the Subordinated Debt Trustee
will be under no obligation to exercise any of its rights or powers under the
Subordinated Debt Indenture at the request, order or direction of the Holders of
the Subordinated Debt Securities, unless such Holders shall have offered to the
Subordinated Debt Trustee reasonable indemnity. Subject to such provisions for
indemnity and certain other limitations contained in the Subordinated Debt
Indenture, the Holders of a majority in
 
                                       14
<PAGE>   63
 
aggregate principal amount of the Subordinated Debt Securities of each affected
series then Outstanding (voting as one class) will have the right to direct the
time, method and place of conducting any proceeding for any remedy available to
the Subordinated Debt Trustee, or exercising any trust or power conferred on the
Subordinated Debt Trustee, with respect to the Subordinated Debt Securities of
such affected series.
 
     The Subordinated Debt Indenture provides that no Holder of Subordinated
Debt Securities may institute any action against CMS Energy under the
Subordinated Debt Indenture (except actions for payment of overdue principal,
premium or interest) unless such Holder previously shall have given to the
Subordinated Debt Trustee written notice of default and continuance thereof and
unless the Holders of not less than 25% in aggregate principal amount of the
Subordinated Debt Securities of the affected series then Outstanding (voting as
one class) shall have requested the Subordinated Debt Trustee to institute such
action and shall have offered the Subordinated Debt Trustee reasonable
indemnity, the Subordinated Debt Trustee shall not have received direction
inconsistent with such request by the Holders of a majority in aggregate
principal amount of the Subordinated Debt Securities of the affected series then
Outstanding (voting as one class).
 
     The Subordinated Debt Indenture requires CMS Energy to furnish to the
Subordinated Debt Trustee annually a statement as to CMS Energy's compliance
with all conditions and covenants under the Subordinated Debt Indenture. The
Subordinated Debt Indenture provides that the Subordinated Debt Trustee may
withhold notice to the Holders of the Subordinated Debt Securities of any series
of any default affecting such series (except defaults as to payment of
principal, premium or interest on the Subordinated Debt Securities of such
series) if it considers such withholding to be in the interests of the Holders
of the Subordinated Debt Securities of such series.
 
     Subordination. The Subordinated Debt Indenture provides (and each Holder of
Subordinated Debt Securities by acceptance thereof agrees) that the Subordinated
Debt Securities will be subordinated in right of payment to the prior payment in
full of all Senior Indebtedness (as defined herein) of CMS Energy. No payment on
account of principal of, premium, if any, or interest on the Subordinated Debt
Securities and no acquisition of, or payment on account of any sinking fund for,
the Subordinated Debt Securities may be made unless full payment of amounts then
due for principal, premium, if any, and interest then due on all Senior
Indebtedness by reason of the maturity thereof (by lapse of time, acceleration
or otherwise) has been made or duly provided for in cash or in a manner
satisfactory to the Holders of such Senior Indebtedness. In addition, the
Subordinated Debt Indenture provides that upon the happening and during the
continuation of any default in payment of the principal of, premium, if any, or
interest on any Senior Indebtedness when the same becomes due and payable or in
the event any judicial proceeding shall be pending with respect to any such
default, then, unless and until such default shall have been cured or waived or
shall have ceased to exist, no payment shall be made by CMS Energy with respect
to the principal of, premium, if any, or interest on Subordinated Debt
Securities or to acquire any Subordinated Debt Securities or on account of any
sinking fund provisions applicable to Subordinated Debt Securities. CMS Energy
shall give prompt written notice to the Subordinated Debt Trustee of any default
in payment of principal of or interest on any Senior Indebtedness. The
Subordinated Debt Indenture provisions described in this paragraph, however, do
not prevent CMS Energy from making sinking fund payments in Subordinated Debt
Securities acquired prior to the maturity of Senior Indebtedness or, in the case
of default, prior to such default and notice thereof. Upon any distribution of
its assets in connection with any
 
                                       15
<PAGE>   64
 
dissolution, winding up, liquidation or reorganization of CMS Energy, whether
voluntary or involuntary, in bankruptcy, insolvency or receivership proceedings
or upon an assignment for the benefit of creditors or otherwise: (i) all Senior
Indebtedness must be paid in full before the Holders of the Subordinated Debt
Securities are entitled to any payments whatsoever; and (ii) any payment or
distribution of CMS Energy's assets of any kind or character, whether in cash,
securities or other property, which would otherwise (but for the subordination
provisions) be payable or deliverable in respect of the Subordinated Debt
Securities shall be paid or delivered directly to the Holders of such Senior
Indebtedness (or their representative or trustee) in accordance with the
priorities then existing among such Holders until all Senior Indebtedness shall
have been paid in full before any payment or distribution is made to the Holders
of Subordinated Debt Securities. In the event that notwithstanding such
subordination provisions, any payment or distribution of assets of any kind or
character is made on the Subordinated Debt Securities before all Senior
Indebtedness is paid in full, the Subordinated Debt Trustee or the Holders of
Subordinated Debt Securities receiving such payment will be required to pay over
such payment or distribution to the Holders of such Senior Indebtedness. Subject
to the payment in full of all Senior Indebtedness, the rights of the Holders of
the Subordinated Debt Securities will be subrogated to the rights of the Holders
of Senior Indebtedness to receive payments or distributions applicable to Senior
Indebtedness until all amounts owing on the Subordinated Debt Securities are
paid in full. As a result of the subordination provisions, in the event of CMS
Energy's insolvency, Holders of the Subordinated Debt Securities may recover
ratably less than senior creditors of CMS Energy.
 
     "Senior Indebtedness" means the principal of and premium, if any, and
interest on the following, whether outstanding on the date of execution of the
Subordinated Debt Indenture or thereafter incurred, created or assumed:
 
      (i)  Indebtedness of CMS Energy for money borrowed by CMS Energy 
           (including purchase money obligations) or evidenced by debentures 
           (other than the Subordinated Debt Securities), notes, bankers' 
           acceptances or other corporate debt securities or similar instruments
           issued by CMS Energy;
 
      (ii) Obligations with respect to letters of credit;
 
     (iii) All Indebtedness of others of the type referred to in the preceding
           clauses (i) and (ii) assumed by or guaranteed in any manner by CMS
           Energy or in effect guaranteed by CMS Energy; or
 
     (iv)  Renewals, extensions or refundings of any of the indebtedness 
           referred to in the preceding clauses (i), (ii) and (iii) unless, in 
           the case of any particular indebtedness, renewal, extension or 
           refunding, under the express provisions of the instrument creating or
           evidencing the same or the assumption or guarantee of the same, or 
           pursuant to which the same is outstanding, such indebtedness or such
           renewal, extension or refunding thereof is not superior in right of
           payment to the Subordinated Debt Securities.
 
     The Subordinated Debt Indenture does not limit the aggregate amount of
Senior Indebtedness that may be issued. As of September 30, 1998, Senior
Indebtedness of CMS Energy aggregated approximately $2,321 million.
 
     Consolidation, Merger or Sale of Assets. The Subordinated Debt Indenture
provides that CMS Energy may consolidate with or merge into, or sell, lease or
convey its property as an entirety or substantially as an entirety to, any other
corporation if such corporation
 
                                       16
<PAGE>   65
 
assumes the obligations of CMS Energy under the Subordinated Debt Securities and
the Subordinated Debt Indenture and is organized and existing under the laws of
the United States of America, any state thereof or the District of Columbia.
 
     Modification of the Subordinated Debt Indenture. The Subordinated Debt
Indenture permits CMS Energy and the Subordinated Debt Trustee to enter into
supplemental indentures thereto without the consent of the Holders of the
Subordinated Debt Securities to:
 
     (A) Secure the Subordinated Debt Securities of one or more series;
 
     (B) Evidence the assumption by a successor corporation of the obligations
         of CMS Energy under the Subordinated Debt Indenture and the
         Subordinated Debt Securities then Outstanding;
 
     (C) Add covenants for the protection of the Holders of the Subordinated
         Debt Securities;
 
     (D) Cure any ambiguity or correct any defect or inconsistency in the
         Subordinated Debt Indenture or to make such other provisions as CMS
         Energy deems necessary or desirable with respect to matters or
         questions arising under the Subordinated Debt Indenture, provided that
         no such action adversely affects the interests of any Holders of
         Subordinated Debt Securities;
 
     (E) Establish the form and terms of any series of securities under the
         Subordinated Debt Indenture; and
 
     (F) Evidence the acceptance of appointment by a successor Subordinated Debt
         Trustee.
 
     The Subordinated Debt Indenture also permits CMS Energy and the
Subordinated Debt Trustee, with the consent of the Holders of not less than a
majority in aggregate principal amount of the Subordinated Debt Securities of
all series then Outstanding and affected (voting as one class), to enter into
supplemental indentures to add any provisions to, or change in any manner or
eliminate any of the provisions of, the Subordinated Debt Indenture or modify in
any manner the rights of the Holders of Subordinated Debt Securities of each
such affected series; provided, however, that CMS Energy and the Subordinated
Debt Trustee may not, without the consent of the Holder of each Subordinated
Debt Security then outstanding and affected thereby, enter into a supplemental
indenture to:
 
     (A) Change the time of payment of the principal (or any installment of
         principal) of any Subordinated Debt Security, or reduce the principal
         amount thereof, or reduce the rate or change the time of payment of
         interest thereon, or reduce the amount payable on any Original Issue
         Discount Securities upon acceleration or provable in bankruptcy, or
         impair the right to institute suit for the enforcement of any payment
         on any Subordinated Debt Security when due; or
 
     (B) Reduce the percentage in principal amount of the Subordinated Debt
         Securities of the affected series, the consent of whose Holders is
         required for any such modification or for any waiver provided for in
         the Subordinated Debt Indenture.
 
     Prior to the acceleration of the maturity of any Subordinated Debt
Security, the Holders of a majority in aggregate principal amount of the
Subordinated Debt Securities of
 
                                       17
<PAGE>   66
 
all series at the time Outstanding with respect to which a default or an Event
of Default shall have occurred and be continuing (voting as one class) may on
behalf of the Holders of all such affected Subordinated Debt Securities waive
any past default or Event of Default and its consequences, except a default or
an Event of Default in respect of a covenant or provision of the Subordinated
Debt Indenture or of any Subordinated Debt Security which cannot be modified or
amended without the consent of the Holder of each Subordinated Debt Security
affected.
 
     Defeasance, Covenant Defeasance and Discharge. The Subordinated Debt
Indenture provides that, at the option of CMS Energy:
 
     (A) CMS Energy will be discharged from any and all obligations in respect
         of the Subordinated Debt Securities of a particular series then
         Outstanding (except for certain obligations to register the transfer of
         or exchange the Subordinated Debt Securities of such series, to replace
         stolen, lost or mutilated Subordinated Debt Securities of such series,
         to maintain paying agencies and to maintain the trust described below),
         or
 
     (B) CMS Energy need not comply with certain restrictive covenants of the
         Subordinated Debt Indenture (including those described under
         "Consolidation, Merger or Sale of Assets"), in each case if CMS Energy
         irrevocably deposits in trust with the Subordinated Debt Trustee money,
         and/or securities backed by the full faith and credit of the United
         States which, through payment of the principal thereof and the interest
         thereon in accordance with their terms, will provide money in an amount
         sufficient to pay all the principal of and premium, if any, and
         interest on the Subordinated Debt Securities of such series on the
         stated maturity of such Subordinated Debt Securities (which may include
         one or more redemption dates designated by CMS Energy) in accordance
         with the terms thereof.
 
     To exercise such option, CMS Energy is required, among other things, to
deliver to the Subordinated Debt Trustee an opinion of independent counsel to
the effect that the exercise of such option would not cause the Holders of the
Subordinated Debt Securities of such series to recognize income, gain or loss
for United States federal income tax purposes as amounts, in the same manner and
at the same times as would have been the case if such defeasance had not
occurred, and, in the case of a discharge as described in clause (A) of the
preceding paragraph, such opinion is to be accompanied by a private letter
ruling to the same effect received from the Internal Revenue Service, a revenue
ruling to such effect pertaining to a comparable form of transaction published
by the Internal Revenue Service or appropriate evidence that since the date of
the Subordinated Debt Indenture there has been a change in the applicable
federal income tax law.
 
     In the event CMS Energy exercises its option to effect a covenant
defeasance with respect to the Subordinated Debt Securities of any series as
described in the preceding paragraph and the Subordinated Debt Securities of
such series are thereafter declared due and payable because of the occurrence of
any Event of Default other than an Event of Default caused by failing to comply
with the covenants which are defeased, and the amount of money and securities on
deposit with the Subordinated Debt Trustee would be insufficient to pay amounts
due on the Subordinated Debt Securities of such series at the time of the
acceleration resulting from such Event of Default, CMS Energy would remain
liable for such amounts.
 
                                       18
<PAGE>   67
 
     CMS Energy may also obtain a discharge of the Subordinated Debt Indenture
with respect to all Subordinated Debt Securities then Outstanding (except for
certain obligations to register the transfer of or exchange such Subordinated
Debt Securities to replace stolen, lost or mutilated Subordinated Debt
Securities, to maintain paying agencies and to maintain the trust described
below) by irrevocably depositing in trust with the Subordinated Debt Trustee
money, and/or securities backed by the full faith and credit of the United
States which, through the payment of the principal thereof and the interest
thereon in accordance with their terms, will provide money in an amount
sufficient to pay all the principal of and premium, if any, and interest on the
Subordinated Debt Securities on the stated maturities thereof (including one or
more redemption dates), provided that such Subordinated Debt Securities are by
their terms due and payable, or are to be called for redemption, within one
year.
 
     For United States federal income tax purposes any deposit contemplated in
the preceding paragraph would be treated as an exchange of the Subordinated Debt
Securities outstanding for other property. Accordingly, holders of Subordinated
Debt Securities outstanding may be required to recognize a gain or loss for
United States federal income tax purposes upon such exchange. In addition, such
Holders thereafter may be required to recognize income from such property which
could be different from the amount that would be includable in the absence of
such deposit. Prospective investors are urged to consult their own tax advisors
as to the specific consequences to them of such deposit.
 
     Governing Law. The Subordinated Debt Indenture and the Subordinated Debt
Securities will be governed by, and construed in accordance with, the laws of
the State of Michigan except to the extent the laws of another jurisdiction
shall be mandatorily applicable.
 
                                 LEGAL OPINIONS
 
     Opinions as to the legality of certain of the Offered Securities will be
rendered for CMS Energy by Michael D. Van Hemert, Esq., Assistant General
Counsel for CMS Energy. Certain legal matters with respect to Offered Securities
will be passed upon by counsel for any underwriters, dealers or agents, each of
whom will be named in the related prospectus supplement.
 
                                    EXPERTS
 
     The consolidated financial statements and schedule of CMS Energy as of
December 31, 1997 and 1996, and for each of the three years in the period ended
December 31, 1997 incorporated by reference in this prospectus, have been
audited by Arthur Andersen LLP, independent public accountants, as indicated in
their reports with respect thereto, and are included herein in reliance upon the
authority of said firm as experts in accounting and auditing in giving said
reports.
 
     With respect to the unaudited interim consolidated financial information
for the periods ended March 31, 1998 and 1997, June 30, 1998 and 1997, and
September 30, 1998 and 1997, Arthur Andersen LLP has applied limited procedures
in accordance with professional standards for a review of such information.
However, their separate reports thereon state that they did not audit and they
did not express an opinion on that interim consolidated financial information.
Accordingly, the degree of reliance on their report on
 
                                       19
<PAGE>   68
 
that information should be restricted in light of the limited nature of the
review procedures applied. In addition, the accountants are not subject to the
liability provisions of Section 11 of the Securities Act, for their reports on
the unaudited interim consolidated financial information because those reports
are not a "report" or "part" of the registration statement prepared or certified
by the accountants within the meaning of Sections 7 and 11 of the Securities
Act.
 
     Future consolidated financial statements of CMS Energy and the reports
thereon of Arthur Andersen LLP also will be incorporated by reference in this
prospectus in reliance upon the authority of that firm as experts in giving
those reports to the extent that said firm has audited said consolidated
financial statements and consented to the use of their reports thereon.
 
                              PLAN OF DISTRIBUTION
 
     CMS Energy may sell the Offered Securities: (i) through the solicitation of
proposals of underwriters or dealers to purchase the Offered Securities; (ii)
through underwriters or dealers on a negotiated basis; (iii) directly to a
limited number of purchasers or to a single purchaser; or (iv) through agents.
The prospectus supplement with respect to any Offered Securities will set forth
the terms of such offering, including the name or names of any underwriters,
dealers or agents; the purchase price of the Offered Securities and the proceeds
to CMS Energy from such sale; any underwriting discounts and commissions and
other items constituting underwriters' compensation; any initial public offering
price and any discounts or concessions allowed or reallowed or paid to dealers
and any securities exchange on which such Offered Securities may be listed. Any
initial public offering price, discounts or concessions allowed or reallowed or
paid to dealers may be changed from time to time.
 
     If underwriters are used in the sale, the Offered Securities will be
acquired by the underwriters for their own account and may be resold from time
to time in one or more transactions, including negotiated transactions, at a
fixed public offering price or at varying prices determined at the time of sale.
The Offered Securities may be offered to the public either through underwriting
syndicates represented by one or more managing underwriters or directly by one
or more firms acting as underwriters. The underwriter or underwriters with
respect to a particular underwritten offering of Offered Securities will be
named in the prospectus supplement relating to such offering and, if an
underwriting syndicate is used, the managing underwriter or underwriters will be
set forth on the cover of such prospectus supplement. Unless otherwise set forth
in the prospectus supplement relating thereto, the obligations of the
underwriters to purchase the Offered Securities will be subject to certain
conditions precedent, and the underwriters will be obligated to purchase all the
Offered Securities if any are purchased.
 
     If dealers are utilized in the sale of Offered Securities, CMS Energy will
sell such Offered Securities to the dealers as principals. The dealers may then
resell such Offered Securities to the public at varying prices to be determined
by such dealers at the time of resale. The names of the dealers and the terms of
the transaction will be set forth in the prospectus supplement relating thereto.
 
     The Offered Securities may be sold directly by CMS Energy or through agents
designated by CMS Energy from time to time. Any agent involved in the offer or
sale of the Offered Securities in respect to which this prospectus is delivered
will be named, and
 
                                       20
<PAGE>   69
 
any commissions payable by CMS Energy to such agent will be set forth, in the
prospectus supplement relating thereto. Unless otherwise indicated in the
prospectus supplement, any such agent will be acting on a best efforts basis for
the period of its appointment.
 
     The Offered Securities may be sold directly by CMS Energy to institutional
investors or others, who may be deemed to be underwriters within the meaning of
the Securities Act with respect to any resale thereof. The terms of any such
sales will be described in the prospectus supplement relating thereto.
 
     Agents, dealers and underwriters may be entitled under agreements with CMS
Energy to indemnification by CMS Energy against certain civil liabilities,
including liabilities under the Securities Act, or to contribution with respect
to payments which such agents, dealers or underwriters may be required to make
in respect thereof. Agents, dealers and underwriters may be customers of, engage
in transactions with, or perform services for CMS Energy in the ordinary course
of business.
 
     The Offered Securities may or may not be listed on a national securities
exchange. Reference is made to the prospectus supplement with regard to such
matter. No assurance can be given that there will be a market for any of the
Offered Securities.
 
                                       21
<PAGE>   70
================================================================================

JANUARY 20, 1999
 
                                     [LOGO]
 
                                  $480,000,000
 
                            7.5% SENIOR NOTES DUE 2009
 
                   ------------------------------------------
                             PROSPECTUS SUPPLEMENT
                   ------------------------------------------
 
                          DONALDSON, LUFKIN & JENRETTE
                                BARCLAYS CAPITAL
                             CHASE SECURITIES INC.
                     NATIONSBANC MONTGOMERY SECURITIES LLC
 
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 No person has been authorized to give any information or to make any
 representations other than those contained in this prospectus supplement or
 the base prospectus, and, if given or made, such information or
 representations must not be relied upon as having been authorized. This
 prospectus supplement and the base prospectus do not constitute an offer to
 sell or the solicitation of an offer to buy any securities other than the
 securities described in this prospectus supplement or an offer to sell or the
 solicitation of an offer to buy such securities in any circumstances in which
 such offer or solicitation is unlawful. Neither the delivery of this
 prospectus supplement or the base prospectus nor any sale made hereunder or
 thereunder shall, under any circumstances, create any implication that there
 has been no change in the affairs of the Company since the date hereof or that
 the information contained herein or therein is correct as of any time
 subsequent to its date.
 
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