Comcast has agreed to provide cable service to 540 homes on Chappaquiddick Island, but only if residents agree to cover part of the cost, which Comcast estimates will be $1,526 per home, assuming everyone offered the service signs up.

Martha’s Vineyard, with Chappaquiddick Island to the east

The cable company has been at odds with town officials in Edgartown, which is responsible for negotiating franchise agreements for six Massachusetts island communities and Edgartown itself. Comcast said it would cost $1.58 million to wire up the small island, and it wants residents to pay $824,000 of that.

The cable company also wants residents to pay extra for connections if their homes lie more than 250 feet from the primary cable Comcast intends to wire across the island. Beyond that, customers will pay Comcast’s usual rates for cable TV, phone, and broadband service.

Edgartown wants Comcast to cover the island towns that surround it, and the company in turn has routinely claimed there were insufficient customers available to recoup the costs of the investment.  But attitudes have softened now that Comcast’s franchise is up for renewal.

Local officials issued a request for proposals in February, 2011 to a variety of cable operators that might be interested in serving Martha’s Vineyard, of which Chappaquiddick is a part. As anticipated, Comcast — the incumbent, was the only company that responded.

But after an extended back and forth, Comcast seemed willing to relent, if someone split the tab.

Local residents have had mixed reactions to the proposal. Some wonder why they should have to foot the bill for a company that will earn $8 million annually from customers on the various nearby islands. Others are willing to pay, but in installments.

Edgartown town administrator Pam Dolby wants a more detailed breakdown of the cost estimate of $1.58 million to wire just over six square miles of the island.