The two companies agreed to promote the use of natural gas vehicles in both the public and private sectors, to introduce new natural gas vehicles into the market, and to create the refueling infrastructure.

Gas Natural will also expand its own use of NGVs within its fleet.

GM’s Opel has offered natural gas vehicles since 1999, and has sold more than 40,000 units into Italy and Germany, the leading European users. Spain currently has few,  according to the International Association of Natural Gas Vehicles: 797 as of January 2005.