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GridStor Secures $220M in Debt to Complete Battery Storage

GridStor secured $220M in Debt Financing led by ING Capital, KeyBank, and Zions Capital Markets to complete its White Tank battery storage facility.

By Raina Gimmel

GridStor raises $220M

The big picture: GridStor has closed a $220 million debt financing package to complete development of its 100 MW/400 MWh White Tank battery energy storage facility in Maricopa County, Arizona. The financing provides capital to advance the utility-scale battery project toward its expected start of operations in the first half of 2027.

Why it matters:

  • Surging Demand: Arizona faces rising electricity demand from population growth and new industrial development, with a new peak recorded 5% higher than the previous year.
  • Grid Stability: Standalone battery systems are crucial for managing peak demand, integrating diverse generation resources, and maintaining system reliability in evolving power grids.
  • Lender Confidence: The financing reflects growing lender participation in utility-scale battery storage, signaling its increasing importance as a component of U.S. power infrastructure.

How it works:

  • Long-Term Agreement: White Tank will operate under a 20-year tolling agreement with Arizona Public Service (APS), the state’s largest electric utility, providing a contracted operating framework.
  • Strategic Capacity: The 100 MW/400 MWh facility is designed to store electricity and deliver it when demand and grid conditions require additional supply, supporting economic growth.
  • Targeted Expansion: GridStor, backed by Goldman Sachs Asset Management, is building a pipeline exceeding 3 GW of battery storage projects in regions with high load growth and grid constraints.

The catch: The utility-scale battery storage market is becoming increasingly competitive and capital-intensive. While lender participation is growing, securing substantial debt financing for large projects requires robust commercial agreements and a proven development track record, posing a barrier for newer entrants.

Key Facts

  • Company: GridStor
  • Amount: $220M
  • Round: Debt Financing
  • Investor: ING Capital LLC and KeyBank N.A. and Zions Capital Markets (co-lead)
  • Founder: Chris Taylor
  • Sector: Battery Energy Storage

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