The plant has a production capacity of 1,040 MW (1,390,000 hp) and a pumping capacity of 940 MW (1,260,000 hp). . By 2012, Iran had roughly 400 power plant units. [1][2][3] There are [as of?] plans to add more than 5,000 MW of generation capacity annually to the power grid. . Siah Bisheh Pumped Storage Power Plant, also known as Siah Bisheh Power Plant, is a hydroelectric power plant located in the foothills of the Alborz mountain range and adjacent to the Siah Bisheh Trust, located 48 km (30 mi) of Chalus in Mazandaran province, 125 km north of Tehran. This data is a derivitive set of data gathered by source mentioned below. Global Energy Observatory/Google/KTH Royal Institute of Technology in Stockholm/Enipedia/World Resources Institute/database. earth Data. . With more than 85 gigawatts of installed capacity, Iran is one of the largest electricity producers in West Asia, yet the sector is saddled with a series of challenges which have resulted in production/consumption imbalances.