The project includes one new submarine cable and one replacement cable connecting Martha's Vineyard to the Massachusetts mainland, along with upgrades to substations, underground infrastructure and distribution equipment. Collectively, the improvements add approximately 37 MW of capacity while increasing system reliability and redundancy. Distribution system improvements in Oak Bluffs, West Tisbury and other parts of Martha's Vineyard. A key outcome of the project is the retirement of five diesel generators that had provided seasonal generation support for the island. Eversource said retiring the units will reduce emissions and noise while supporting the island's transition to a cleaner electric system.