November 14, 2025

GridStor

GridStor, a Goldman Sachs Asset Management-backed developer and operator of utility-scale battery energy storage systems, named Spencer Mash as the company's senior vice president of finance and head of capital markets. Mash brings more than 20 years of experience in capital management to the GridStor executive team, including more than a decade of renewable energy finance focused on distributed generation and utility-scale solar and wind projects across the United States. Prior to joining GridStor, most recently Mash co-founded and served as executive vice president of Greenbacker Renewable Energy Company, an investment manager and independent power producer. In his SVP role, Mash will lead financing transactions to support the company's portfolio of more than 3 GW of battery energy storage projects in later-stage development, under construction, and already operating. As head of capital markets, Mash will negotiate and structure diverse capital solutions, manage relationships with lenders and investors, and ensure rigorous due diligence processes. Mash's prior roles include serving as vice president at Deerfield Capital Management, where he performed due diligence and financial analyses, negotiated loan documentation, and monitored private middle-market first lien, second lien, mezzanine, and one-stop senior secured debt investments. He began his career in the Leveraged Acquisition Finance group at Bank of America Merrill Lynch. GridStor is headquartered in Portland.