SCHEDULE 13G/A

NRG ENERGY INC COM NEW

Common Stock, par value $0.01 per share · CUSIP: 629377508

Event date: 2026-03-04

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Lightning Power Holdings, LLC

  Shares: 6,371,100.00 · Class: 3.00%

• Fund III Lightning Holdings, LLC

  Shares: 6,371,100.00 · Class: 3.00%

• Granite Energy, LLC

  Shares: 6,371,100.00 · Class: 3.00%

• Granite Energy Holdings, LLC

  Shares: 6,371,100.00 · Class: 3.00%

• LS Power Equity Partners III, L.P.

  Shares: 6,371,100.00 · Class: 3.00%

• LS Power Partners III, L.P.

  Shares: 6,371,100.00 · Class: 3.00%

• LS Power Fund III G.P., LLC

  Shares: 6,371,100.00 · Class: 3.00%

• LS Power Equity Advisors, LLC

  Shares: 8,120,731.00 · Class: 3.82%

• David Nanus

  Shares: 8,120,731.00 · Class: 3.82%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.