UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

October 5, 2015

Date of Report (Date of earliest event reported)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Section 1 — Registrant’s Business and Operations

Item 1.01. Entry into a Material Definitive Agreement

On October 5, 2015, PECO Energy Company (PECO) issued $350 million aggregate principal amount of its First and Refunding Mortgage Bonds, 3.150% Series due October 15, 2025. See Item 2.03 below for a description of the bonds and related agreements.

Section 2 — Financial Information

Item 2.03. Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

On October 5, 2015, PECO issued $350 million aggregate principal amount of its First and Refunding Mortgage Bonds, 3.150% Series due October 15, 2025. The bonds were issued pursuant to PECO’s First and Refunding Mortgage, dated as of May 1, 1923, as amended and supplemented and as further amended and supplemented by the One Hundred and Twelfth Supplemental Indenture, dated as of September 15, 2015 (112^th Supplemental Indenture). The bonds were registered under the Securities Act of 1933, as amended, pursuant to a shelf registration statement on Form S-3 (Registration No. 333-196220-02).

PECO will use the net proceeds from the sale of the bonds for general corporate purposes.

The bonds carry an interest rate of 3.150% per annum, which is payable semi-annually on April 15 and October 15, commencing on April 15, 2016. The bonds are redeemable at any time at PECO’s option as provided in the 112^th Supplemental Indenture. A copy of the 112^th Supplemental Indenture, which establishes the terms of the bonds, is attached hereto as Exhibit 4.1 and is incorporated herein by reference.

In connection with the issuance of the bonds, Ballard Spahr LLP provided PECO with the legal opinions attached to this report as Exhibit 5.1 and Exhibit 8.1.

A copy of the Underwriting Agreement dated September 28, 2015 among PECO, Credit Suisse Securities (USA) LLC, Mitsubishi UFJ Securities (USA), Inc. and Scotia Capital (USA) Inc., as representatives of the several underwriters named therein is filed as Exhibit 1.1 to this report.

Section 9 – Financial Statements and Exhibits

Item 9.01. Financial Statements and Exhibits.

The following exhibits are filed herewith and are exhibits to the Registration Statement on Form S-3, Registration No. 333-196220-02, as noted below:

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* * * * *

This Current Report contains certain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 that are subject to risks and uncertainties. The factors that could cause actual results to differ materially from the forward-looking statements made by PECO include those discussed herein as well as the items discussed in (1) PECO’s 2014 Annual Report on Form 10-K in (a) ITEM 1A. Risk Factors, (b) ITEM 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations and (c) ITEM 8. Financial Statements and Supplementary Data: Note 22; (2) PECO’s Second Quarter 2015 Quarterly Report on Form 10-Q in (a) Part II, Other Information, ITEM 1A. Risk Factors; (b) Part 1, Financial Information, ITEM 2. Management’s Discussion and Analysis of Financial Condition and Results of Operation and (c) Part I, Financial Information, ITEM 1. Financial Statements: Note 19; and (3) other factors discussed in filings with the Securities and Exchange Commission by PECO. Readers are cautioned not to place undue reliance on these forward-looking statements, which apply only as of the date of this Current Report. PECO undertakes no obligation to publicly release any revision to its forward-looking statements to reflect events or circumstances after the date of this Current Report.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

October 5, 2015

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EXHIBIT INDEX

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