The Dhahban and Hizyaz substations also have generating capacity in addition to being supplied by the Ma'rib plant. The Dhahban station is the main one in Sanaa; located 10 km northwest of the city, it had an original generating capacity of 20 MW, with another 30 MW installed during the 2000s, bringing the total to 50 MW. The Hizyaz station consists of three power plants: the first, with a capacity of 30 MW, was completed in 2002. Another 60 MW plant was added in 2004, and then in 2007 the third plant, with a capacity of 30 MW, was also completed.