Two electric utilities seeking to reduce their property taxes in dozens of towns across New Hampshire lost an appeal Friday to the state Supreme Court.

Eversource and the New Hampshire Electric Cooperative sought tax abatements from 64 towns in 2011 and 2012, but the state Board of Tax and Land Appeals rejected most of those requests, and the utilities appealed.

The utilities argued that towns' property tax assessments were too high and that their property taxes instead should be based on a valuation formula used by the state Department of Revenue Administration in levying a separate utility tax.

In the ruling released Friday, the court sided with the towns, though it said it was troubled by substantial differences in assessments by towns for property tax purposes and assessments by the state for utility taxes. The court said such disputes could be avoided by adopting a uniform appraisal method, a decision for the Legislature, not the courts.

Eversource spokesman Martin Murray said the company has a duty to dispute valuations made by communities the company considers extreme outliers compared to the state assessments. He said the company remains concerned about the wide discrepancies.