How it Works

In Run-of-River (ROR) systems, running water is diverted from a river by a weir and guided down to a channel, forebay and then penstock, which leads to a powerhouse. The force of the moving water spins a turbine, which then drives a generator. Used water is fed back into the main river further downstream. The difference between run-of-river and large, conventional storage hydro, is the absence of a dam and reservoir. Run-of-river relies on coursing rivers to generate electricity, as opposed to stored water. Most small hydro facilities use a weir to ensure enough water enters the penstock.