I think you are thinking about Pawtucket, RI. There are a series of old brick buildings along the banks of the Blackstone River, one of which is an old hydroelectric plant that was refurbished in the early 1980s. for use as the business office for Blackstone Valley Electric Company.
I know there is one in South Grafton on the Blackstone river, another in Worcester, Uxbridge also has one, not so sure about Northbridge. There are many old mill towns on the Blackstone River, all of them have man-made waterfalls in which the energy was used to power the mills which were almost entirely made of brick