A new solar project in Washington state is partnering with data center operators to deliver firm power backed by four-hour battery energy storage systems.
Rising electricity consumption from data centers and other digital facilities is driving plans for a new energy development in Grant County, Washington. The proposed Appledale Energy Center, developed by Hawthorne Renewable Energy, will combine large-scale solar generation with battery storage to address growing demand. Targeted for full operation in 2028, the project will feature 300 megawatts of solar capacity paired with a 300-megawatt battery energy storage system offering four hours of storage. It is designed to serve both the local grid and high-demand commercial users, particularly data centers.
During the project’s early development phase, Hawthorne engaged global engineering consulting firm RINA. According to Renewable Energy World, Jonás Rodríguez, Head of Renewables North America at RINA, said the company’s work spanned design optimization, preliminary layout planning, energy-yield modeling, parcel analysis, geotechnical review, and support for transformer inspections. By evaluating the site’s terrain, setbacks, easements, permitting constraints, and county slope requirements, RINA produced an initial optimized layout estimated at approximately 400 megawatt-peak of direct-current capacity.
Once operational, the facility is projected to generate more than 650 gigawatt-hours of electricity annually, sufficient to power over 50,000 Washington households. Grant County has long been an attractive location for energy development due to its favorable transmission access and site conditions. These same advantages are now accelerating regional power demand as data centers and digital infrastructure operators seek reliable, scalable electricity supplies.
While solar panels generate power only during daylight hours, the integrated four-hour battery system can store excess energy and dispatch it during evening demand peaks, periods of grid stress, or unexpected disruptions. This flexibility enhances reliability for residents and businesses, enables utilities to avoid costly emergency measures, and stabilizes the grid during extreme weather or heavy usage. Additionally, it allows municipalities and corporations to manage power more efficiently, reducing outage risks and mitigating expenses associated with peak-time electricity pricing.
The Appledale project reflects a broader evolution in clean energy development, where generation capacity alone is no longer the primary metric. Modern projects are increasingly evaluated based on the dependability, financeability, and grid compatibility of their power supply. Before construction begins, RINA’s mandate is to minimize project uncertainty, Renewable Energy World reported. Leveraging GIS tools and solar design software, the firm mapped buildable zones, excluded constrained land, and developed an early plan for panel blocks, roads, inverter and transformer stations, a battery area, and a substation near the interconnection point.
RINA also conducted what it termed a bankable energy-yield assessment, incorporating site solar data, topography, shading, system losses, and expected bifacial gain to estimate output and uncertainty. These projections enable investors and developers to validate whether the project will perform as modeled. Furthermore, the firm analyzed adjacent parcels to assess whether acquiring neighboring land could expand capacity or provide additional development flexibility. RINA additionally reviewed geotechnical plans and supported transformer due diligence and factory inspections to preemptively identify potential performance, budgetary, or scheduling complications.
If approved and executed as planned, the Appledale Energy Center will demonstrate how integrating solar generation with battery storage can help rapidly expanding regions accommodate surging electricity demand. The project underscores a transition toward more flexible, resilient, and future-ready grid infrastructure capable of supporting an increasingly electrified economy.