All dams at the Ruhr's impounded lakes, with the exception of the weir at Kemnad, are used to generate hydropower. A hydropower station for Lake Kemnad is currently under construction. Altogether, the power stations of the various impounded lakes have a capacity of 27.4 megawatts, generating an average amount of 88.5 KW/h per year.
In addition, the creation of Lake Hengstey offered an opportunity to build a pumped storage hydrostation. Thus, at times of light load, the “Koepchenwerk” hydrostation can pump about 1.5 million cubic metres of water from Lake Hengstey to a reservoir situated higher up within 7.5 hours. At times of peak load, this reservoir can be emptied in a little under four hours, thus serving an important function as a peak energy supplier.
|Hydrostation technical specifications|
|Lake Hengstey||Stiftsmühle||Lake Harkort||Lake Kemnade||Lake Baldeney||Lake Kettwiger|
|Average head (m)||4.6||2.0||7.8||2.6||8.7||6.0|
|Turbines||3 Kaplan||3 Kaplan||3 Kaplan||1 Kaplan||2 Kaplan 1)||3 Kaplan|
|Maximum design flow (m3/s)||100||110||120||35||140||145|
|Average annual production (Mil. kWh)||13.0||7.5||24.0||4.0||28.0||16.0|
1) Additional reverse pump turbine 1 x Kaplan