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Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]:
SEC Accession No. 0000352541-10-000009
Filing Date
2010-02-26
Accepted
2010-02-26 16:12:12
Documents
25
Period of Report
2009-12-31

Document Format Files

Seq Description Document Type Size
1 FORM 10-K 12/31/09 form10k123109.htm 10-K 10991368
2 FORM 10-K 12/31/09 EXHIBIT 10.4D form10k123109exh10pt4d.htm EX-10.4D 89810
3 FORM 10-K 12/31/09 EXHIBIT 10.4F form10k123109exh10pt4f.htm EX-10.4F 68837
4 FORM 10-K 12/31/09 EXHIBIT 10.5 form10k123109exh10pt5.htm EX-10.5 15308
5 FORM 10-K 12/31/09 EXHIBIT 10.15 form10k123109exh10pt15.htm EX-10.15 9643
6 FORM 10-K 12/31/09 EXHIBIT 12.1 form10k123109exh12pt1.htm EX-12.1 119691
7 FORM 10-K 12/31/09 EXHIBIT 12.2 form10k123109exh12pt2.htm EX-12.2 114665
8 FORM 10-K 12/31/09 EXHIBIT 12.3 form10k123109exh12pt3.htm EX-12.3 120205
9 FORM 10-K 12/31/09 EXHIBIT 21.1 form10k123109exh21pt1.htm EX-21.1 5076
10 FORM 10-K 12/31/09 EXHIBIT 21.2 form10k123109exh21pt2.htm EX-21.2 5017
11 FORM 10-K 12/31/09 EXHIBIT 23.1 form10k123109exh23pt1.htm EX-23.1 3161
12 FORM 10-K 12/31/09 EXHIBIT 23.2 form10k123109exh23pt2.htm EX-23.2 2877
13 FORM 10-K 12/31/09 EXHIBIT 23.3 form10k123109exh23pt3.htm EX-23.3 2938
14 FORM 10-K 12/31/09 EXHIBIT 23.4 form10k123109exh23pt4.htm EX-23.4 2848
15 FORM 10-K 12/31/09 EXHIBIT 31.1 form10k123109exh31pt1.htm EX-31.1 18962
16 FORM 10-K 12/31/09 EXHIBIT 31.2 form10k123109exh31pt2.htm EX-31.2 19001
17 FORM 10-K 12/31/09 EXHIBIT 31.3 form10k123109exh31pt3.htm EX-31.3 18956
18 FORM 10-K 12/31/09 EXHIBIT 31.4 form10k123109exh31pt4.htm EX-31.4 19017
19 FORM 10-K 12/31/09 EXHIBIT 31.5 form10k123109exh31pt5.htm EX-31.5 18954
20 FORM 10-K 12/31/09 EXHIBIT 31.6 form10k123109exh31pt6.htm EX-31.6 19015
21 FORM 10-K 12/31/09 EXHIBIT 32.1 form10k123109exh32pt1.htm EX-32.1 4009
22 FORM 10-K 12/31/09 EXHIBIT 32.2 form10k123109exh32pt2.htm EX-32.2 4006
23 FORM 10-K 12/31/09 EXHIBIT 32.3 form10k123109exh32pt3.htm EX-32.3 4005
24 FORM 10-K 12/31/09 EXHIBIT 99.1 form10k123109exh99pt1.htm EX-99.1 860051
26 FORM 10-K 12/31/09 PDF form10k123109.pdf 10-K 1236647
  Complete submission text file 0000352541-10-000009.txt   14244905
Mailing Address 200 FIRST ST SE ALLIANT ENERGY TOWER CEDAR RAPIDS IA 52401
Business Address 200 FIRST ST SE ALLIANT ENERGY TOWER CEDAR RAPIDS IA 52401 3193984411
INTERSTATE POWER & LIGHT CO (Filer) CIK: 0000052485 (see all company filings)

IRS No.: 420331370 | State of Incorp.: IA | Fiscal Year End: 1231
Type: 10-K | Act: 34 | File No.: 001-04117 | Film No.: 10639438
SIC: 4931 Electric & Other Services Combined

Mailing Address 4902 N BILTMORE LANE SUITE 1000 MADISON WI 53718-2148
Business Address 4902 NORTH BILTMORE LANE SUITE 1000 MADISON WI 53718-2148 608-458-3311
WISCONSIN POWER & LIGHT CO (Filer) CIK: 0000107832 (see all company filings)

IRS No.: 390714890 | State of Incorp.: WI | Fiscal Year End: 1231
Type: 10-K | Act: 34 | File No.: 000-00337 | Film No.: 10639437
SIC: 4931 Electric & Other Services Combined

Mailing Address 4902 NORTH BILTMORE LANE SUITE 1000 MADISON WI 53718-2148
Business Address 4902 NORTH BILTMORE LANE SUITE 1000 MADISON WI 53718-2148 608-458-3311
ALLIANT ENERGY CORP (Filer) CIK: 0000352541 (see all company filings)

IRS No.: 391380265 | State of Incorp.: WI | Fiscal Year End: 1231
Type: 10-K | Act: 34 | File No.: 001-09894 | Film No.: 10639436
SIC: 4931 Electric & Other Services Combined