EDP Completes 800 MWh Flatland Energy Storage in Arizona, Largest…

Event summary

EDP Renewables North America (EDPR NA) and Salt River Project (SRP) completed the 200 MW / 800 MWh Flatland Energy Storage project in Coolidge, Arizona, on June 9, 2026.
The project is the largest battery energy storage system (BESS) within the EDP Group, capable of powering approximately 44,500 Arizona homes.
Flatland Energy Storage represents over $20 million in local and regional economic impact, including $19.2 million in revenue for public services and infrastructure.
EDPR NA has approximately 600 MW of gross operating capacity across solar and storage in Arizona, powering over 113,000 homes.

The big picture

The completion of Flatland Energy Storage underscores the strategic importance of utility-scale battery projects in enhancing grid flexibility and reliability. As Arizona's energy demand continues to grow, investments in energy storage are becoming critical for maintaining a resilient electric grid. EDP's leadership in this space positions it well to capitalize on the increasing need for sustainable and reliable power solutions.

What we're watching

Grid Reliability: How the integration of large-scale BESS projects like Flatland will affect grid stability and peak demand management in Arizona.
Regulatory Dynamics: Whether Arizona's growing energy demand will drive further investment in utility-scale battery storage projects.
Economic Impact: The pace at which similar projects will be developed in Pinal County and other regions, given the demonstrated economic benefits.