# EDGAR Filing Document

**Accession Number:** 0000107832
**File Stem:** 0001193125-25-305184
**Filing Date:** 2025-12
**Character Count:** 5105
**Document Hash:** 1a64bd895e93a03df05797e059f46356
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-305184.hdr.sgml**: 20251202

**ACCESSION NUMBER**: 0001193125-25-305184

**CONFORMED SUBMISSION TYPE**: FWP

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251202

**DATE AS OF CHANGE**: 20251202

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** WISCONSIN POWER & LIGHT CO
- **CENTRAL INDEX KEY:** 0000107832
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC & OTHER SERVICES COMBINED [4931]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 390714890
- **STATE OF INCORPORATION:** WI
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** FWP
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 333-276062-02
- **FILM NUMBER:** 251542964

**BUSINESS ADDRESS:**
- **STREET 1:** 4902 NORTH BILTMORE LANE
- **STREET 2:** SUITE 1000
- **CITY:** MADISON
- **STATE:** WI
- **ZIP:** 53718-2148
- **BUSINESS PHONE:** 608-458-3311

**MAIL ADDRESS:**
- **STREET 1:** 4902 N BILTMORE LANE
- **STREET 2:** SUITE 1000
- **CITY:** MADISON
- **STATE:** WI
- **ZIP:** 53718-2148
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** WISCONSIN POWER & LIGHT CO
- **CENTRAL INDEX KEY:** 0000107832
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC & OTHER SERVICES COMBINED [4931]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 390714890
- **STATE OF INCORPORATION:** WI
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** FWP

**BUSINESS ADDRESS:**
- **STREET 1:** 4902 NORTH BILTMORE LANE
- **STREET 2:** SUITE 1000
- **CITY:** MADISON
- **STATE:** WI
- **ZIP:** 53718-2148
- **BUSINESS PHONE:** 608-458-3311

**MAIL ADDRESS:**
- **STREET 1:** 4902 N BILTMORE LANE
- **STREET 2:** SUITE 1000
- **CITY:** MADISON
- **STATE:** WI
- **ZIP:** 53718-2148

Filed Pursuant to Rule 433

Dated December 2, 2025

Registration Statement No. 333-276062-02

<u>WISCONSIN POWER AND LIGHT COMPANY</u> 

<u>Final Term Sheet</u> 

<u>Dated December 2, 2025</u> 

**<u>5.700% Debentures due 2055</u>**

---

| | |
|:---|:---|
| Issuer: | Wisconsin Power and Light Company |
| Security Type: | Debentures |
| Principal Amount: | $300000000 |
| Maturity Date: | December 15, 2055 |
| Benchmark Treasury: | 4.75% due August 15, 2055 |
| Benchmark Treasury Yield: | 4.746% |
| Spread to Benchmark Treasury: | +98 bps |
| Yield to Maturity: | 5.726% |
| Price to Public: | 99.627% of the principal amount |
| Coupon: | 5.700% |
| Interest Payment Dates: | June 15 and December 15, commencing June 15, 2026 |
| Optional Redemption – Reinvestment Rate: | Prior to June 15, 2055, make-whole call at T+15 bps |
| Optional Redemption at Par: | On or after June 15, 2055 |
| Trade Date: | December 2, 2025 |
| Settlement Date: | December 5, 2025 (T+3) |
| CUSIP: | 976826 BT3 |
| ISIN: | US976826BT33 |
| Denominations / Multiples: | $2,000 x $1,000 |
| Anticipated Ratings\*: | Baa1 / A- (Moody's / S&P) |
| Joint Book-Running Managers: | Mizuho Securities USA LLC<br> Wells Fargo Securities, LLC<br> BofA Securities, Inc.<br> MUFG Securities Americas Inc. |
| Co-Managers: | Academy Securities, Inc.<br> PNC Capital Markets LLC<br> U.S. Bancorp Investments, Inc. |

---

\* A securities rating is not a recommendation to buy, sell or hold securities and may be subject to revision or withdrawal at any time.

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**It is expected that delivery of the Debentures will be made against payment therefor on or about December 5, 2025, which will be the third business day following the date of pricing of the Debentures. Under Rule 15c6-1 of the Securities Exchange Act of 1934, trades in the secondary market generally are required to settle in one business day, unless the parties to any such trade expressly agree otherwise. Accordingly, by virtue of the fact that the Debentures initially will settle in T+3, purchasers who wish to trade the Debentures on any date prior to the business day before delivery should specify an extended settlement cycle at the time they enter into any such trade to prevent failed settlement and should consult their own advisors.** 

**The issuer has filed a registration statement (including a prospectus) with the Securities and Exchange Commission (the "SEC") for the offering to which this communication relates. Before you invest, you should read the prospectus in that registration statement and other documents that the issuer has filed with the SEC for more complete information about the issuer and this offering. You may get these documents for free by visiting EDGAR on the SEC Web site at www.sec.gov. Alternatively, you may request a copy of these documents by calling Mizuho Securities USA LLC toll free at 1-866-271-7403, Wells Fargo Securities, LLC toll free at 1-800-645-3751, BofA Securities, Inc. toll free at 1-800-294-1322 or MUFG Securities Americas Inc. toll free at 1-877-649-6848.** 

**Any disclaimers or other notices that may appear below are not applicable to this communication and should be disregarded. Such disclaimers and other notices were automatically generated as a result of this communication being sent via Bloomberg or another email system.**