List of longest running hydroelectric power plants

This is a list of oldest hydroelectric power plants that are in operation.

Constructed in the 19th century

Steigbachwerk, Immenstadt, Germany, 175 m. start 1880, 270 kW. 146 years old.
Ames Hydroelectric Generating Plant, Colorado, USA, constructed in 1890, 136 years old.
Nagold Hydroelectric Plant, Germany, since 1893, 133 133 years old^[1]
Mechanicville Hydroelectric Plant, USA, constructed in 1897, 129 years old.
Mambach Hydroelectric Plant, Germany, constructed in 1897, 129 years old.^[2]

Appleton Powerhouse, USA, 2.2MW, constructed in 1901, 125 years old.^[3]
Landara Hydroelectric Plant, Bolivia, opened 1902, 124 years old.^[4]
Quintana Hydroelectric Plant, Spain, operational since 1902, 124 years old. 18.45 metres, rated output of 7.8 MW, producing an annual average of 23 GWh
Necaxa Hydroelectric Plant, Mexico, opened in 1905, 121 years old. Both the plant and parts of the original transmission line are still in service.^[5]
Lockport Powerhouse, Illinois, USA, 1907. Now generating 13.4 MW on the Chicago Ship and Sanitary Canal.
Keokuk Energy Center (Lock and Dam No. 19), Iowa, USA, 142MW, constructed in 1910. 116 years old.
La Calera Hydroelectric Plant, Cordoba, Argentina, constructed in 1911.^[6] 115 years old.
Pharping Hydropower Station, Nepal, 500kW, constructed in 1911, 115 years old.
Coyas Hydroelectric Plant, Chile, since 1911,^[7] 115 years old
Pilchowice Hydroelectric Plant, Poland, operational 1912,^[8] 114 years old.
Shilongba Hydropower Station, China, operational 1912,^[9] 114 years old.
Laufenburg Hydroelectric Plant, Germany/Switzerland, operational 1914,^[10] 112 years old.
Big Quinnesec Falls, USA, 4.4 MW, constructed in 1914,^[3] 112 years old.
Brule Power Station, Wisconsin, USA, 5.3 MW, constructed in 1919, 107 years old. ^[3]
Fala Hydro Power Plant, Slovenia, constructed in 1918, 108 years old.

Rheinfelden Hydroelectric Plant, Germany/Switzerland, opened 1898, closed and demolished in 2010, serving 112 years.^[11]