United Parcel Service to Clean Energy Fuels: Let's Make a Deal - Motley Fool What the latest news means for UPS. Right in time for Valentine's Day, United Parcel Service and Clean Energy Fuel Corp. just announced they're deepening their relationship with another natural gas deal. Here's what you need to know. The not-so-dirty details United Parcel Service has agreed to use up to 500,000 gallon equivalents of Clean Energy Fuel Corp.'s renewable liquefied natural gas (RLNG) annually in Texas. The new terms sit on top of a pre-existing deal between the two corporations for UPS to purchase up to 1.5 million gallon equivalents of renewable compressed natural gas annually for use in California. The Texas deal is enough to fuel around 140 UPS tractors, while the Cali contract accommodates nearly 400 vehicles.