Schwarza reservoir, Reservoir in Häusern and Schluchsee, Germany

The Schwarzatalsperre, also called Stausee Schwarzabruck, is a pumped-storage reservoir in the Schwarza valley at about 723 m above sea level. Its gravity dam is 43 m high and 158 m long, holding up to 1.29 million m³; the lake covers at most 20 hectares. The dam and part of the lake lie in Häusern, most of the lake in Schluchsee.

The system was developed in the late 1920s to harness water power for the region's electricity supply. Construction was part of a broader expansion of energy infrastructure that advanced the technical development of the Black Forest area.

The reservoir is named after the Schwarza stream that feeds it, and the dam itself is called Schwarzatalsperre. The Schwarza flows through the valley at about 723 m above sea level, and the reservoir's surface covers at most 20 hectares. The dam is sometimes confused with the Scheibe-Alsbach dam on the Schwarza in Thuringia, which also carries the name Schwarzatalsperre.

The reservoir lies at about 723 m above sea level in the Schwarza valley; roads lead down from the ridges at Häusern and Staufen, but the valley road through the Schwarza valley is only partly open, as a forest and works road. The dam itself is a 43 m high concrete gravity wall, 158 m long.

The reservoir functions like a large energy battery, pumping water uphill when there is excess electricity or releasing it to generate power when needed. This flexible system makes it a crucial buffer for regional power supply and demonstrates how hydropower supports modern energy management.