Riga HES was commissioned in 1974/1975, and it is the youngest of the Daugava hydropower plants. It has 6 hydropower units with the total capacity of 402 MW.

Riga HES, similarly to Plavinas HES, is operated in a synchronous compensator mode to regulate voltage in electric networks.

In Riga HES, great attention is paid to the safety of hydro-technical structures: the safety of the earth dam has been improved; constant restoration is carried out for the concrete surfaces of the Riga HES structures and buildings.

In 2015, the Riga HES generated 433 GWh of electricity.