A new dispute over another missing document has arisen in the increasingly contentious disagreement over regulatory policy between the state’s utilities and the Public Utility Regulatory Authority.

Eversource insists in a complaint filed with the state Freedom of Information Commission — and three witnesses agree — that PURA chair Marissa Gillett’s chief of staff wrote an internal email last year that limited the ability of two other, nominally co-equal authority commissioners to consult staff experts on regulatory questions.

Such a restriction would support the broader utility argument that Gillett has taken personal control of much of PURA’s regulatory apparatus by reducing the role of the other commissioners. The result, the utilities argue, has been unfair and legally suspect r

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