FIRSTENERGY CORP

The first mortgage indentures for the Ohio Companies, FE PA, MP and PE constitute direct first liens on substantially all of the respective physical property, subject only to excepted encumbrances, as defined in the first mortgage indentures. The outstanding debt under the FMBs of specific FE PA predecessors (WP and Penn) were assumed by FE PA in connection with the PA Consolidation. See Note 11., "Capitalization," of the Combined Notes to Financial Statements of the Registrants for information concerning financing encumbrances affecting certain of the Electric Companies' properties.

FirstEnergy controls the following generation sources as of December 31, 2025, shown in the table below, and operates in the PJM Region. Except for the OVEC participation referenced in the footnotes to the table, the Integrated segment's electric generation facilities are owned by MP.

(1) Represents AE Supply's 3.01% and MP's 0.49% entitlement based on their participation in OVEC.

(2) Represents AGC's 16.25% undivided interest in Bath County. The station is operated by VEPCO.

(3)Each facility is net of station use, except for Bath County, which is shown gross of pumping usage.

MP and PE are constructing 50 MWs of solar generation at five sites in West Virginia. The WVPSC approved the construction of three of the five solar sites. Two of the five solar generation sites, Rivesville Solar and Fort Martin Solar, went into service in 2024, and the third, Marlowe Solar, went into service in April 2025, representing a total of 30 MWs of generation capacity.

On October 1, 2025, MP and PE filed their integrated resource plan with the WVPSC, which contemplated the addition of 70 MWs of solar generation by 2028, and 1,200 MWs of natural gas combined cycle generation by 2031 and on February 13, 2026, MP and PE filed a request for a CPCN with the WVPSC to construct and operate the same. See “Outlook – State Regulation – West Virginia" in Item 7., "Management's Discussion and Analysis of Financial Condition and Results of Operations" for additional details.

As of December 31, 2025, FirstEnergy’s distribution and transmission circuit miles are located in PJM and were as follows:

(1)Includes overhead pole line and underground conduit carrying primary, secondary and street lighting circuits.

(2) On January 1, 2024, WP's Pennsylvania-based transmission assets of 115 kV and above were transferred to KATCo, while the remaining transmission assets continue to be held by FE PA and are included in distribution ratemaking.