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Regulators probe root causes and monitoring gaps after Broad Brook solar facility incidents
Summary
The Public Utilities Regulatory Authority convened a technical meeting in docket 25311 to review root-cause reports from Eversource and Next ERA after repeated equipment failures at a Broad Brook solar site; parties flagged relay-memory limits, limited EDC monitoring, and plans for targeted power-quality studies and equipment replacement.
Vice Chairman David Arcante opened a technical session in docket 25311 to review recurrent equipment failures at the Broad Brook solar facility and to consider monitoring and remediation measures to ensure safe re-energization.
The meeting reviewed filings and root-cause analyses that Eversource and Next ERA submitted after incidents in March and July 2025 and an apparent bird strike reported in August 2025. "The community have a right to feel safe," Vice Chairman David Arcante said, framing the proceeding as focused on both technical causes and public-safety outcomes.
Authority staff questioned Eversource and Next ERA about the facility's interconnection, the commissioning and periodic interconnection tests, and how event and waveform data are collected and retained. Eversource described the site as composed of three points of interconnection — two POIs at 2 MW AC and one POI at 1 MW AC — that coalesce before the…
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