PORTLAND, Ore.--(BUSINESS WIRE)--Nov 12, 2025-- GridStor, a Goldman Sachs Asset Management-backed developer and operator of utility-scale battery energy storage systems, announced today that Spencer Mash has been hired 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 responsible for 3.5 gigawatts of clean energy capacity and more than $3.4 billion in assets under management.