The state Supreme Judicial Court Wednesday denied an Edgartown resident’s attempt to intervene in commonwealth approval of a power contract between Cape Wind Associates and the utility National Grid.

Richard Melone and others petitioned to intervene in the power agreement, though an unsigned decision by the court determined that the Department of Public Utilities had the right to deny Mr. Melone’s request to intervene in the department’s approval of the power agreement.

Cape Wind plans to build an offshore wind farm of 130, 440-foot-tall turbines on Horseshoe Shoal in Nantucket Sound.

In this case, the proceedings before the court did not involve construction of the wind farm, but rather National Grid’s proposal to purchase the wind power, which is subject to review by the DPU.

Mr. Melone, who owns a home on Eel Pond, sought to intervene in the state DPU’s approval of the power agreement, arguing that the wind farm would have “adverse effects on him as the owner of beachfront property on Martha’s Vineyard.” Particularly, he said, the wind farm would alter his view, diminish his property value, and that oil or other contaminants from the turbines could make their way to his property.

The request was denied, with the court upholding the DPU decision that the proposed effects on his property were beyond the scope of the proceeding, that his claimed status as an abutter was irrelevant, that the attorney general could adequately represent ratepayers’ interests, and that Mr. Melone was not a National Grid ratepayer, because that company does not serve Martha’s Vineyard.

Mr. Melone sought judicial review of the decision, but the court determined that “the department was well within its broad discretion in denying Melone’s request to intervene in the matter,” according to the opinion. “The environmental and other concerns raised by Melone, even assuming Melone would be ‘substantially and specifically affected’ by them . . . were beyond the scope of the proceeding.”

“Nothing in the [state law] requires the department to address the environmental and visual effects of a renewable energy generating source,” the court said. “In sum, there was no error or abuse of discretion in the department’s denial of Melone’s request to intervene.”

The DPU approved the contract between Cape Wind and National Grid in November 2010. In December, the Supreme Judicial Court rejected challenges to the power contract from Alliance to Protect Nantucket Sound and others.