Clean Energy Fuels Corp. (Nasdaq: CLNE) said the Los Angeles County Metropolitan Transportation Authority (Metro) has signed a new agreement for an estimated 47.5 million gallons of its renewable natural gas (RNG) to fuel the nation’s largest transit bus fleet.

Financial terms were not disclosed.

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Metro awarded Clean Energy three fueling depots for a five-year term, with an option to extend up to three additional years. Clean Energy already delivers RNG to five additional Metro fueling depots under a previously awarded RNG agreement.

Shares in Clean Energy rose 34% to $17.43 per share for a market cap of $3.5 billion following the announcement today.