Keyspan Park is losing some of its electricity — at least in name.

The Brooklyn Cyclones said Friday they have agreed to end their naming rights deal with National Grid PLC, which owns and operates Britain’s power grid. That company acquired KeySpan Energy Corp., the parent of Brooklyn Union Gas Co., in 2007.

The ballpark near the Coney Island boardwalk had been called KeySpan since it opened in 2001, and the naming rights deal was to have run through 2020. The Class A team is owned by the owners of the New York Mets, and the $39 million ballpark seats about 7,500.

“Due to the fact that the KeySpan name no longer exists, it was an opportunity for both parties to discuss other options,” National Grid executive vice president John Caroselli said.

A new deal is expected to be announced shortly.