[GRAPHIC OMITTED]
                 [ALLIANT ENERGY]
                                                      Alliant Energy
                                              Worldwide Headquarters
                                              222 W. Washington Ave.
                                                        P.O. Box 192
                                              Madison, WI 53701-0192
                                               www.alliantenergy.com
News Release
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FOR IMMEDIATE RELEASE          Media Contact:   Chris Schoenherr (608) 252-3924
                                                Karen Whitmer (608)252-4839
                               Finance Contact: Eric Mott (608) 252-3391

ALLIANT ENERGY REPORTS STRONG THIRD QUARTER 2001 EARNINGS
On track to meet earnings targets for 2001

      MADISON, Wis. - Oct. 19, 2001 - Alliant Energy Corp. (NYSE:
LNT) today reported adjusted net income of $74.9 million, or $0.94
per share, for the third quarter of 2001 compared to adjusted net
income of $73.5 million, or $0.93 per share, for the third quarter
of 2000.

      Both periods excluded non-cash valuation adjustments related
to the company's obligation under certain 30-year exchangeable
senior notes - charges of $0.16 per share and $0.02 per share in
the third quarters of 2001 and 2000, respectively.  In addition,
adjusted net income for the third quarter of 2000 excludes $204
million of non-cash net income, or $2.58 per share, relating to
the company's adoption of a new accounting pronouncement (SFAS No.
133) on July 1, 2000.

      Higher electric utility margins, a lower effective income tax
rate and higher earnings from the company's non-regulated
operations were largely offset by increased utility operating
expenses during the quarter.

      "I am pleased to report another solid quarter of financial
performance," said Alliant Energy CEO Erroll B. Davis, Jr.
"Through the successful execution of our Invest, Connect and Grow
strategy, we continue to deliver strong earnings and shareowner
value through both our regulated utility operations and our
portfolio of non-regulated businesses."

      Reported net income and earnings per share for the third
quarters of 2001 and 2000 were $62.3 million, or $0.78 per share,
and $276.2 million, or $3.49 per share, respectively.

      Alliant Energy is the parent company of three public utility
companies - IES Utilities Inc. (IES), Interstate Power Company
(IPC) and Wisconsin Power and Light Company (WP&L) - and of
Alliant Energy Resources, Inc. (AER), the parent company of
Alliant Energy's non-regulated operations.



A reconciliation of Alliant Energy's unaudited third quarter 2001
versus 2000 earnings per share (EPS) is as follows:




                                                                           
EPS as reported - third quarter 2000                                         $3.49
Less: SFAS No. 133 adoption non-cash income                                  (2.58)
Plus: non-cash valuation charge                                                .02
                                                                             ------
Adjusted third quarter 2000 EPS                                                .93
------------------------------------------------------------------------------------------

3Q 2001 EPS increase/(decrease) versus 2000:
     Utility operations:
         Electric margins                                                    $0.08
         Effective income tax rate                                             .07
         Operating expenses                                                   (.17)
         Other                                                                 .04
                                                                             ------
     Total utility operations                                                  .02

     Non-regulated operations:
         Integrated Services business unit                                     .02
         Investments business unit                                             .01
         International business unit                                           .01
         Generation and Trading business unit                                 (.05)
         Lower short-term debt rates/other                                     .04
                                                                             ------
     Total non-regulated operations                                            .03

    Parent expenses/other                                                     (.04)
                                                                             ------
------------------------------------------------------------------------------------------

Adjusted third quarter 2001 EPS                                              $0.94
Less: non-cash valuation charge                                               (.16)
                                                                             ------
EPS as reported - third quarter 2001                                         $0.78
                                                                             ======





                         Utility Operations

      Third quarter 2001 utility earnings were $69.5 million ($0.88
per share) compared to $68.4 million ($0.86 per share) for the
same period in 2000.

      The increase in electric margin was primarily related to
increased residential and commercial sales due to more favorable
weather conditions in the third quarter of 2001 compared to the
same period in 2000 and continued retail customer growth.  Higher
energy conservation revenues also contributed to the increase.

      The increased operating expenses were largely due to higher
costs in the company's energy delivery and generation business
units (certain increases were timing differences), increased
uncollectible customer account balances, higher operating costs at
the Kewaunee Nuclear Power Plant and costs associated with the
implementation of the company's e-business strategy.

                      Non-regulated Operations

      Alliant Energy's non-regulated operations reported adjusted
net income of $8.2 million ($0.10 per share) in the third quarter
of 2001 compared to adjusted net income of $5.3 million ($0.07 per
share) in the third quarter of 2000.

      These figures exclude the non-cash valuation charges of $12.6
million ($0.16 per share) and $1.2 million ($0.02 per share) in
2001 and 2000, respectively, and the $204 million of non-cash net
income ($2.58 per share) in 2000 relating to the company's
adoption of a new accounting pronouncement (SFAS No. 133) on July
1, 2000.  Reported net income/(loss) and earnings per share for
2001 and 2000 were ($4.4) million, or ($0.06) per share, and
$208.0 million, or $2.63 per share, respectively.



      The improved results from the Integrated Services business
unit were largely due to a one-time charge related to a loss on a
contract in the third quarter of 2000.  The higher income from the
Investments business unit was from the company's oil and gas
operations and was largely due to increased sales volumes as a
result of the continued acquisition of additional oil and gas
producing properties.

      The improved results from the International business unit
were due to increased earnings from the company's China and
Australian investments.  The increase for China was largely due to
the addition of five combined heat and power facilities to the
company's China portfolio in the past twelve months and increased
income tax benefits.  The earnings from the Australian operations
included non-cash income from the valuation of certain of its
energy agreements.  These increases were partially offset by lower
earnings from the company's New Zealand investments due to the
impact of a drought in New Zealand and an asset sale gain the
company realized in the third quarter of 2000.  In spite of the
drought conditions in Brazil, the company's results from its
Brazil investments were flat in the third quarter of 2001 compared
to the same period in 2000.

      The lower earnings from our Generation and Trading business
unit were largely the result of reduced income from the company's
electricity trading joint venture due to fewer weather-related
trading opportunities in the third quarter of 2001.

      The non-cash valuation charge in both periods was related to
the net valuation of the 30-year exchangeable senior notes and the
associated McLeodUSA shares designated as trading securities.

                      Future Earnings Outlook

      Thomas M. Walker, Alliant Energy's Chief Financial Officer
stated, "Alliant Energy's guidance for adjusted earnings per share
for 2001 is in the range of $2.40 - $2.50 per share.  Also, our
initial guidance for adjusted earnings per share for 2002 is in
the range of $2.50 - $2.70 per share.   By executing our strategic
plan, our goal is to deliver 7%-10% annual earnings growth,
enhanced shareowner value and meet our financial objectives,
including maintaining our stable dividend."

      Drivers for Alliant Energy's earnings estimates include, but
are not limited to:

>>    Normal weather conditions in its utility service territories
>>    Continued economic development and sales growth in its
      utility service territories
>>    Continued cost control and operational efficiencies in its
      utility operations
>>    Ability of its utility subsidiaries to recover their
      operating costs, and to earn a reasonable rate of return, in
      future rate proceedings
>>    Ability to recover its purchased power and fuel costs, both
      domestically and internationally
>>    Ability to offset start-up and growth-related interest
      expenses in its non-regulated businesses with sales of
      non-strategic assets and to redeploy such proceeds into more
      strategic earnings-generating investments
>>    Continued improved profitability of its international
      investments
>>    Continued improved profitability of its non-regulated
      businesses as a whole, including oil and gas, electricity
      trading, integrated energy and transportation services
>>    Stable oil and gas prices
>>    Other stable business conditions, including a stable economy

      Alliant Energy's strategic plan includes investing in
generation and other energy-related projects; better connecting
with customers through enhanced service reliability, value-added
products and services, and e-business initiatives; and growing the
non-regulated side of its business through partnerships and
acquisitions in generation projects, international markets and
other strategic initiatives.  Alliant Energy's goal is to have its
non-regulated businesses contribute more than 25 percent of its
earnings within the next three years and believes that successful
implementation of these strategies will contribute significantly
to the company achieving its targeted annual growth rate of 7-10
percent in adjusted earnings.

                            --- --- ---


      Alliant Energy, through its subsidiaries and partners,
provides electricity, natural gas, water and steam to over three
million customers worldwide. Through its non-regulated
subsidiaries, Alliant Energy also provides energy products and
services to domestic and international markets; provides
integrated services, including environmental, engineering and
transportation services; invests in affordable housing
initiatives; and invests in various other strategic initiatives.
More information about Alliant Energy is available on the World
Wide Web at www.alliantenergy.com.
            ---------------------
                               # # #



This press release includes forward-looking statements. These
forward-looking statements can be identified as such because the
statements include words such as "expects" or "estimates" or other
words of similar import. Similarly, statements that describe
future financial performance or  plans or strategies are also
forward-looking statements. Such statements are subject to certain
risks and uncertainties that could cause actual results to differ
materially from those currently anticipated. Actual results could
be affected by such factors as: the factors listed in the "Future
Earnings Outlook" section of this press release; weather
conditions; regulatory or governmental actions; economic and
political conditions in Alliant Energy's domestic and
international service territories; unanticipated issues related to
Alliant Energy's ability to implement its strategic plan,
especially as it relates to international investments; Alliant
Energy's ability to identify and successfully complete
acquisitions and development projects; material changes in the
value of Alliant Energy's investments; technological developments;
and inflation rates. These factors should be considered when
evaluating the forward-looking statements and undue reliance
should not be placed on such statements.  Without limitation, the
expectations with respect to projected earnings in the "Future
Earnings Outlook" section of this press release are
forward-looking statements and are based in part on certain
assumptions made by Alliant Energy, some of which are referred to
in the forward-looking statements.  Alliant Energy cannot provide
any assurance that the assumptions referred to in the
forward-looking statements or otherwise are accurate or will prove
to be correct.  Any assumptions that are inaccurate or do not
prove to be correct could have a material adverse effect on
Alliant Energy's ability to achieve the estimates or other targets
included in the forward-looking statements.  The forward-looking
statements included herein are made as of the date hereof and
Alliant Energy undertakes no obligation to update publicly such
statements to reflect subsequent events or circumstances.

Note: Unless otherwise noted, all "per share" references in this
release refer to earnings per diluted share.




                                                ALLIANT ENERGY CORPORATION
                                       CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)

                                                                 For the Three Months              For the Nine Months
                                                                  Ended September 30,               Ended September 30,
                                                                 2001            2000             2001             2000
----------------------------------------------------------------------------------------------------------------------------
                                                                        (in thousands, except per share amounts)
Operating revenues:
                                                                                                        
  Electric utility                                               $519,851       $480,763        $1,367,281      $1,248,228
  Gas utility                                                      42,979         41,369           396,229         226,156
  Non-regulated and other                                         103,435         81,060           367,309         226,755
                                                             -------------   -------------     ------------    -------------
                                                                  666,265        603,192         2,130,819       1,701,139
                                                             -------------   -------------     ------------    -------------
----------------------------------------------------------------------------------------------------------------------------
Operating expenses:
  Electric and steam production fuels                              94,894         80,605           248,040         213,990
  Purchased power                                                 108,177         85,553           318,024         222,690
  Cost of utility gas sold                                         23,660         22,660           303,984         136,642
  Other operation and maintenance                                 194,663        168,522           629,845         526,562
  Depreciation and amortization                                    85,502         79,625           256,278         233,506
  Taxes other than income taxes                                    25,643         26,206            83,628          79,171
                                                             -------------   -------------     ------------    -------------
                                                                  532,539        463,171         1,839,799       1,412,561
                                                             -------------   -------------     ------------    -------------
----------------------------------------------------------------------------------------------------------------------------
Operating income                                                  133,726        140,021           291,020         288,578
                                                             -------------   -------------     ------------    -------------
----------------------------------------------------------------------------------------------------------------------------
Interest expense and other:
  Interest expense                                                 46,169         45,040           143,500         127,452
  Equity income from unconsolidated investments                   (11,688)        (9,890)          (30,766)        (12,598)
  Allowance for funds used during construction                     (3,373)        (2,186)           (8,845)         (6,825)
  Preferred dividend requirements of subsidiaries                   1,680          1,679             5,040           5,035
  Gain on reclassification of investments                              --       (321,349)               --        (321,349)
  Gain on sale of McLeodUSA Inc. stock                                 --             --                --         (10,206)
  Miscellaneous, net                                                8,518         (8,216)            3,412         (27,948)
                                                             -------------   -------------     ------------    -------------
                                                                   41,306       (294,922)          112,341        (246,439)
                                                             -------------   -------------     ------------    -------------
----------------------------------------------------------------------------------------------------------------------------
Income before income taxes                                         92,420        434,943           178,679         535,017
                                                             -------------   -------------     ------------    -------------
----------------------------------------------------------------------------------------------------------------------------
Income taxes                                                       30,135        175,403            59,709         213,879
                                                             -------------   -------------     ------------    -------------
----------------------------------------------------------------------------------------------------------------------------
Income before cumulative effect of a change in
   accounting principle, net of tax                                62,285        259,540           118,970         321,138
                                                             -------------   -------------     ------------    -------------
----------------------------------------------------------------------------------------------------------------------------
Cumulative effect of a change in accounting
   principle, net of tax                                               --         16,708                --          16,708
                                                             -------------   -------------     ------------    -------------
----------------------------------------------------------------------------------------------------------------------------
Net income                                                        $62,285       $276,248          $118,970        $337,846
                                                             =============   =============     ============    =============
----------------------------------------------------------------------------------------------------------------------------
Average number of common shares outstanding - basic                79,240         79,004            79,107          79,001
                                                             =============   =============     ============    =============
----------------------------------------------------------------------------------------------------------------------------
Earnings per average common share - basic:
   Income before cumulative effect of a change
       in accounting principle                                      $0.79          $3.29             $1.50           $4.07
   Cumulative effect of a change in accounting principle              --            0.21               --             0.21
                                                             -------------   -------------     ------------    -------------
   Net income                                                       $0.79          $3.50             $1.50           $4.28
                                                             =============   =============     ============    =============
----------------------------------------------------------------------------------------------------------------------------
Average number of common shares outstanding - diluted              79,350         79,160            79,241          79,202
                                                             =============   =============     ============    =============
----------------------------------------------------------------------------------------------------------------------------
Earnings per average common share - diluted:
   Income before cumulative effect of a change
       in accounting principle                                      $0.78          $3.28             $1.50           $4.06
   Cumulative effect of a change in accounting principle              --            0.21               --             0.21
                                                             -------------   -------------     ------------    -------------
   Net income                                                       $0.78          $3.49             $1.50           $4.27
                                                             =============   =============     ============    =============
----------------------------------------------------------------------------------------------------------------------------
Dividends declared per common share                                 $0.50          $0.50             $1.50           $1.50
                                                             =============   =============     ============    =============
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                                                      KEY STATISTICS

---------------------------------------------------------------------------------------------------------------------------

                                                                 For the Twelve Months
                                                                  Ended September 30,
                                                                 2001            2000
                                                              ------------   -------------
                                                                 (in thousands, except
                                                                  per share amounts)

                                                                            
Operating revenues                                             $2,834,664      $2,232,827
Net income                                                       $179,786        $382,643
Average common shares (diluted)                                    79,222          79,153
Earnings per share (diluted)                                        $2.27           $4.83





---------------------------------------------------------------------------------------------------------------------------

                                                                 For the Three Months              For the Nine Months
                                                                  Ended September 30,              Ended September 30,
                                                                 2001            2000              2001           2000
                                                              ------------   -------------     -------------  -------------

                                                                                                       
Utility electric sales from ultimate customers                     6,877           6,846           19,257         19,227
(thousands of MWh)

Total utility electric sales                                       8,194           8,139           23,163         22,974
(thousands of MWh)

Utility gas sold & transported                                    16,233          14,332           73,849         66,780
(thousands of dekatherms)

---------------------------------------------------------------------------------------------------------------------------

Book value per share, September 30, 2001                           $20.17 **
Book value per share, September 30, 2000                           $26.30

**  The decline in book value per share is largely due to the decline in value of Alliant Energy's publicly-traded
    investments, which are adjusted to their fair market value on a quarterly basis, and foreign currency translation
    adjustments.