Eversource officials said customers should expect savings on their next bill.
The company was able to a lower price for customers due to lower wholesale power prices.
The newly approved generation rate will charge 6.61 cents per kilowatt-hour, which a saving of 3 cents.
Eversource said the rate is expected to average a reduction of $21 for those with standard service.
The rate is the lowest since 2004.
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