Consider this a cart-pulls-horse scenario.

Nissan has started a trial program in Japan that involves a Leaf electric vehicle supplying power to a building during mid-afternoon peak electricity-usage periods, Green Car Congress reported, citing the Nikkei.

Under the program, a municipal building in the Oppama district of the Kanagawa Prefecture, about 20 miles south of Tokyo, will get about four percent of its power from a Leaf between 1 p.m. and 3 p.m.

This is the latest in a series of small vehicle-to-grid (V2G) tests that involve the Leaf. Last August, Nissan debuted a system in which a Leaf could provide as many as two days of electricity for a typical Japan home (which uses about 11 kilowatt hours of electricity per day) and said it had intentions of commercializing the system.