Invenergy LLC, one of the largest private clean-energy companies in North America, aims to begin construction on a 24.9-megawatt solar facility on Long Island in October, according to a company spokeswoman.

The Long Island Power Authority last week approved a power purchase agreement for all the output from Invenergy’s proposed Shoreham Solar Commons project in Brookhaven, New York, Invenergy said in a statement Tuesday. Shoreham Solar is expected to provide enough power to supply 3,500 homes.

The purchase agreement still needs final sign off from the state’s attorney general and comptroller, the spokeswoman for Chicago-based Invenergy said. The company anticipates those reviews will conclude by September, with construction starting the next month, she said in an e-mail, noting that the company has not yet announced an expected in-service date.

The project will be built on Brookhaven’s former Tallgrass Golf Course.

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