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Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]:
SEC Accession No. 0000107832-06-000055
Filing Date
2006-03-03
Accepted
2006-03-02 18:59:10
Documents
22
Period of Report
2005-12-31

Document Format Files

Seq Description Document Type Size
1 FORM 10-K 12-31-05 form10k123105.htm 10-K 4927849
2 FORM 10-K 12-31-05 EXHIBIT 10.19 form10k123105exh10pt19.htm EX-10 161947
3 FORM 10-K 12-31-05 EXHIBIT 10.26 form10k123105exh10pt26.htm EX-10 83963
4 FORM 10-K 12-31-05 EXHIBIT 10.31 form10k123105exh10pt31.htm EX-10 27621
5 FORM 10-K 12-31-05 EXHIBIT 12.1 form10k123105exh12pt1.htm EX-12 13099
6 FORM 10-K 12-31-05 EXHIBIT 12.2 form10k123105exh12pt2.htm EX-12 11197
7 FORM 10-K 12-31-05 EXHIBIT 12.3 form10k123105exh12pt3.htm EX-12 11889
8 FORM 10-K 12-31-05 EXHIBIT 21 form10k123105exh21.htm EX-21 7382
9 FORM 10-K 12-31-05 EXHIBIT 23.1 form10k123105exh23pt1.htm EX-23 2228
10 FORM 10-K 12-31-05 EXHIBIT 23.2 form10k123105exh23pt2.htm EX-23 2030
11 FORM 10-K 12-31-05 EXHIBIT 23.3 form10k123105exh23pt3.htm EX-23 2029
12 FORM 10-K 12-31-05 EXHIBIT 31.1 form10k123105exh31pt1.htm EX-31 13924
13 FORM 10-K 12-31-05 EXHIBIT 31.2 form10k123105exh31pt2.htm EX-31 13945
14 FORM 10-K 12-31-05 EXHIBIT 31.3 form10k123105exh31pt3.htm EX-31 12719
15 FORM 10-K 12-31-05 EXHIBIT 31.4 form10k123105exh31pt4.htm EX-31 12249
16 FORM 10-K 12-31-05 EXHIBIT 31.5 form10k123105exh31pt5.htm EX-31 12717
17 FORM 10-K 12-31-05 EXHIBIT 31.6 form10k123105exh31pt6.htm EX-31 12247
18 FORM 10-K 12-31-05 EXHIBIT 32.1 form10k123105exh32pt1.htm EX-32 3055
19 FORM 10-K 12-31-05 EXHIBIT 32.2 form10k123105exh32pt2.htm EX-32 3016
20 FORM 10-K 12-31-05 EXHIBIT 32.3 form10k123105exh32pt3.htm EX-32 3015
22 GRAPHIC img1.jpg GRAPHIC 2494
23 FORM 10-K 12-31-05 form10k123105.pdf 10-K 11928946
  Complete submission text file 0000107832-06-000055.txt   21780619
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.: 06661405
SIC: 4931 Electric & Other Services Combined

Mailing Address 4902 N BILTMORE LANE PO BOX 77007 MADISON WI 53707-1007
Business Address 4902 NORTH BILTMORE LANE PO BOX 77007 MADISON WI 53707-1007 608-4583314
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.: 06661404
SIC: 4931 Electric & Other Services Combined

Mailing Address 4902 NORTH BILTMORE LANE PO BOX 77007 MADISON WI 53707-1007
Business Address 4902 NORTH BILTMORE LANE PO BOX 77007 MADISON WI 53707-1007 608-458-3314
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.: 06661403
SIC: 4931 Electric & Other Services Combined