The Alliance to Protect Nantucket Sound (APNS), Associated Industries of Massachusetts, New England Power Generation Association and TransCanada Power Marketing are challenging the power-purchase agreement (PPA) associated with the wind farm negotiated between Cape Wind and National Grid.
They say the agreement is overpriced and the extra cost of the offshore project will be passed on to electricity consumers.
"A decision by the court to allow the Cape Wind-National Grid contract to stand would sentence ratepayers to increased electric bills and a future of skyrocketing renewable-energy costs," said Audra Parker, president and CEO of APNS.
The four organisations also object to the fact that no competitive bids were received for the PPA.
Cape Wind is in line to be the first offshore wind-energy development in US waters.