Talen Energy Corporation filed a Form 8-K/A (Amendment No. 1) on August 12, 2026, amending its original June 15, 2026 Current Report to include required financial statements and pro forma financial information related to its $3.5 billion Cornerstone Acquisition.

Key Highlights

  • Cornerstone Acquisition closed June 15, 2026 at an aggregate purchase price of $3.5 billion.
  • Purchase price comprised $2.6 billion in cash and 2,399,998 shares of TEC common stock, valued at $927 million at closing.
  • Three power facilities acquired from affiliates of Energy Capital Partners: the 1,120 MW Lawrenceburg Power Plant (Indiana), the 875 MW Waterford Energy Center (Ohio), and the 456 MW Darby Generating Station (Ohio).
  • Audited financials for Cornerstone Generation, LLC cover the year ended December 31, 2025, with unaudited condensed financials for the three months ended March 31, 2026.
  • Pro forma statements of operations cover the year ended December 31, 2025 and the six months ended June 30, 2026.
  • Amendment signed by Cole Muller, Chief Financial Officer, on August 12, 2026.

Talen Energy's Cornerstone Acquisition: Financial Disclosures and Acquired Assets

According to the filing, Talen Energy Corporation (NASDAQ:TLN) filed this 8-K/A solely to supply financial disclosures that were not included in the original Form 8-K filed on June 15, 2026. The amendment provides the historical financial statements and unaudited pro forma condensed combined financial information required by Items 9.01(a) and 9.01(b) of Form 8-K. The filing states that "except as provided herein, the disclosures made in the Original Report remain unchanged."

The Cornerstone Acquisition, as described in the filing, involved Talen Energy acquiring all equity interests of certain affiliates of Energy Capital Partners that owned three natural gas generation facilities: the Lawrenceburg Power Plant, a 1,120 megawatt combined cycle gas turbine facility in Lawrenceburg, Indiana; the Waterford Energy Center, an 875 MW combined cycle gas turbine facility in Waterford, Ohio; and the Darby Generating Station, a 456 MW combustion turbine facility in Mount Sterling, Ohio. The aggregate purchase price was $3.5 billion, comprised of $2.6 billion in cash and 2,399,998 shares of TEC common stock valued at $927 million at closing.

The financial statements filed as exhibits include audited consolidated financials of Cornerstone Generation, LLC and Subsidiaries for the year ended December 31, 2025 (Exhibit 99.1), unaudited condensed financials for the three months ended March 31, 2026 (Exhibit 99.2), and audited combined financial statements of Gas Plant Business (A Carve-Out of Lightstone Generation, LLC) for the period January 1 to August 10, 2025 (Exhibit 99.3). The pro forma condensed combined financial information in Exhibit 99.4 reflects the company's operations after giving effect to the Cornerstone Acquisition, covering the year ended December 31, 2025 and the six months ended June 30, 2026. RSM US LLP served as independent auditors for both Cornerstone Generation, LLC and the Gas Plant Business carve-out, according to the consent exhibits.

What Was Disclosed

This amendment to Talen Energy's June 15, 2026 Current Report adds required historical financial statements for the acquired Cornerstone entities and unaudited pro forma combined financial information, following the completion of the $3.5 billion Cornerstone Acquisition on June 15, 2026.