Unconventional Pumped Hydro Storage
Building an adequate energy storage system is one of the central challenges of the renewable energy transition. Pumped hydro storage is a very important option. Most people associate this with a dam in a valley behind which water can be pumped upwards in times of excess renewable energy available, in order for it to be released later, when the electricity is required.
But there are more options. One of them is building a large reservoir on top of mountain. Another one, attractive for the flatlanders, is building a high dike in the sea.
Elevation: 510 m (highest in Europe),
Reservoirs: 2.7 million m3 (higher) and 3.4 million m3 (lower)
Pump-generators: 2 x 325 MW
More than 2 GW, generating 5,000 GWh/year.
[source] So-called Plan Lievense, dating from 1981. With the massive Dutch multi-GW wind power plans for the North Sea, to be realized before 2023, some form of energy storage is inevitable. One of the options is building dike structure that allow for fluctuating water levels of up to 40 meter.
Design consists of a closed ring-shaped dike of ca. 6 x 10 km. Water levels will very from 32 to 40 meter under the water level of the surrounding North Sea. Lake surface area: ca. 40 km2. Storage capacity is more than 20 GWh (value 5 million euro consumer end price of 25 cent/kWh), sufficient to produce 1,500 MW during at least 12 hours to the national grid. this plan could be profitable from 9 GW wind offshore wind power, expected after 2020..
[Google Maps] – Brouwersmeer
[deepresource] – Pumped Hydro Storage