The Metropolitan Transportation Authority is soaking up the sun.

It came out — for a while — on Thursday as the MTA and New York Power Authority showed off 48 solar panels at a Brooklyn subway facility.

The panels heat water for employee restrooms at the Coney Island maintenance shop. The water also is used to wash parts of subway cars.

The effort is designed to cut costs and greenhouse gas emissions.

The D, Q, R, N, and M subway cars and the Franklin Avenue shuttle get a weekly bath. The solar panels have been operating since April.

New York City Transit President Thomas Predergast said the panels and new lighting equipment are expected to save $94,000 per year. They could reduce greenhouse gas emissions by 86 tons annually.