Eversource late change on grounding transformer risks delay, $3 million tax credit for Rockingham County solar project

Revision Energy told the Rockingham County Board of Commissioners on May 22 that Eversource has unexpectedly reversed earlier interconnection findings and now requires a grounding transformer for the county’s new solar array — a change Revision said could add “low 6 figures” in rework costs and delay energizing the system by six to 12 months.

The change threatens the county’s ability to claim an elective federal income‑tax payment tied to the Inflation Reduction Act, Revision said, because the county must place the project in service before the fiscal‑year end to register for the credit. "We're probably talking low 6 figures for the rework and this transformer grounding matter," Revision Energy Chief Operating Officer James Hasselbeck told the commissioners. "We have an airtight documentation trail wherever sources told us we do not need this piece of equipment."

The nut of the problem: Revision said the county and contractor completed mechanical work and testing and had an executed interconnection agreement with…