YPFB Andina is an E&P subsidiary of Bolivia's state hydrocarbons company YPFB. It is involved in oil and gas exploration, production, distribution and sales. It is the largest hydrocarbon producer in the country, supplying nearly 40% of Bolivia's natural gas and more than 32% of the country's crude and condensed oil and gasoline production. The company has interests in 21 areas; 18 as operator and three as strategic partner. YPFB Andina also holds a non-operating interest (50%) in the San Antonio and San Alberto consortia formed in association with Petrobras Bolivia (35%) and Total E&P Bolivie (15%). YPFB Andina also holds stakes in natural gas transportation company Transierra S.A. and in the Rio Grande compression plant. The company was created in 1997 as Empresa Petrolera Andina S.A., and later became a joint venture between the Bolivian state and Repsol Bolivia S.A., subsidiary of the Spanish energy company Repsol. It is headquartered in Santa Cruz, Bolivia.