Talen Energy Corp

18. Segments

Talen’s operating segments are based on the market areas in which our generation facilities operate and reflect the manner in which our Chief Executive Officer, who is the chief operating decision maker, reviews results and allocate resources. Adjusted EBITDA is the key profit metric used to measure financial performance of each segment. Total assets or other asset metrics are not considered a key metric or reviewed by the chief operating decision maker.

“PJM” is engaged in electricity generation, marketing activities, and commodity risk and fuel management within the PJM RTO market and is comprised of Susquehanna and Talen’s natural gas and coal generation facilities in PJM.

“Other” represents an operating segment that includes the operating and marketing activities of Talen Montana’s proportionate share of Colstrip in the WECC market and other non-material operating and development activities. “Other” also includes the operating activities of Nautilus until Bitcoin mining operations were suspended in October 2024 and the operating activities of our Texas power generation facilities in the ERCOT market prior to their disposition in May 2024. We have determined it appropriate to aggregate results of Talen’s remaining non-reportable segments and other operating activities.

“Corporate and Eliminations” represents a non-reportable segment that includes: (i) general and administrative expenses incurred by our corporate function; (ii) interest expense and other corporate activities not allocated to our operating segments; and (iii) intercompany eliminations. This grouping is presented to reconcile the reportable segments to our consolidated results.

(a)This significant segment expense category aligns with the segment-level information that is regularly provided to the CODM.

(b)Other segment items are primarily comprised of fuel and energy purchases.

Reconciliation of segment Adjusted EBITDA to Income (Loss) Before Income Taxes:

(a)See Note 17 for additional information.