BUFFALO, N.Y. — Starting next month, National Grid customers across Western New York will start to see their electric bills increase — with new rate hikes following out in three phases over the next three years.

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The Public Service Commission unanimously approved the rate hike Thursday, which will take effect September 1. For the average customer, electric bills will rise about $25 a month by the end of the phase-in period.

The changes will come in three installments:

National Grid spokesperson David Bertola said the additional revenue will go toward replacing aging infrastructure — some of it 60 to 70 years old — and preparing for future demand from electric vehicles and electric heating.

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