HADLEY — A Worcester company denied permission to place a standalone battery in a Breckenridge Road gravel pit is suing the town’s Planning Board, contending its Jan. 7 decision is legally untenable and “unreasonable, arbitrary and capricious.”

Attorneys for ZP Battery Devco LLC filed the lawsuit in Hampshire Superior Court on on Jan. 31 against the Planning Board, which voted 4-0 against issuing a solar energy special permit for a business use in an aquifer zone to the company.

Zero-Point has long eyed the 5-acre site on Breckenridge Road, owned by Karl’s Excavating, for a battery project with an estimated storage capacity of 5 megawatts, with eight battery containers and associated components.

According to the lawsuit filed by James Vevone and Todd Rodman of Seder & Chandler LLP of Worcester, there were several problems with the decision as written, including citing the location’s proximity to the Mount Warner wells and their previous contamination from perchlorate.

The Planning Board’s decision also pointed to the proximity to homes and the playground at Zatyrka Park, and that more than half of the energy to be stored by the battery wasn’t coming from renewable energy sources, and thus the project would not be eligible under the so-called Dover Amendment of state law.

Zero-Point originally filed plans in December 2023, but the hearing was repeatedly delayed until the town got a bylaw in place allowing stand-alone energy storage systems, which had previously been prohibited.

The new bylaw allows stand-alone batteries, but puts limits on them, due to their potential impact on the aquifer and Hadley’s water supply.