By Richard Nemec, NGI's Daily Natural Gas Index.

Renewable natural gas (RNG) sales for Newport Beach, CA-based Clean Energy Fuels Corp. more than doubled last year as part of its fueling options in the natural gas vehicle (NGV) sector.

Branded as "Redeem," Clean Energy's RNG offering expanded beyond its California fueling outlets to ones in Oregon and Texas last year.

Clean Energy sold more than 50 million gasoline gallon equivalents (GGE) last year, compared to 20 million GGEs of Redeem in 2014, the company said on Thursday, noting some major fleet operators who are using the product in their NGVs, such as United Parcel Service (UPS), Santa Monica, CA's Big Blue bus system, and the University of California, San Diego, campus.