Current TV, the ratings-challenged cable network started by former Vice President Al Gore, has put itself up for sale, The Post has learned.

“Current has been approached many times by media companies interested in acquiring our company,” CEO Joel Hyatt told The Post. “This year alone, we have had three inquiries. As a consequence, we thought it might be useful to engage expertise to help us evaluate our strategic options.”

Current is still interviewing investment banks and has yet to launch a formal sales process, said one source.