Thomas H. Buttgenbach is an American businessman in the clean energy industry [1]. He is the founder of Avantus, one of the largest independent solar and energy storage developers in the US [2][3] (previously 8minute Solar Energy, and 8minutenergy Renewables LLC).
Under Tom’s leadership, Avantus secured over $10 Billion in power purchase agreements and project financings. With over 30 GW of solar and 90 GWh of energy storage, capable of powering the homes of more than 20 million Americans day and night, Avantus had one of the largest clean energy portfolios in the U.S., before he sold it to KKR in mid-2024.[4]