Narva Reservoir is a reservoir by the Narva River, shared by Russia and Estonia. The reservoir was constructed during 1955–1956, during the Soviet era. It provides water to Narva Hydroelectric Station (installed capacity 125 MW, located on the Russian side and owned by the power company TGC-1), and cooling water to the Estonian Narva Power Plants. Its surface area at normal headwater level of 25 m is 191 km2, of which 40 km2 belongs to Estonia. Its drainage basin is 55848 km2. The overall water exchange rate is high (about 30 times a year), with some almost stagnant areas. The ecological status is estimated as "good" (as of 2007).