Flat-Land Large-Scale Electricity Storage (FLES)

Lecture at the European Energy Conference 2012, Maastricht

¹ Sogecom BV, Vrijthof 48, NL – 6211, LE, Maastricht

Abstract

Growth of renewable sources requires a smarter electricity grid, integrating multiple solutions for large scale storage. Pumped storage still is the most valid option. The capacity of existing facilities is not sufficient to accommodate future renewable resources. New locations for additional pumped storage capacity are scarce. Mountainous areas mostly are remote and do not allow construction of large facilities for ecological reasons. In the Netherlands underground solutions were studied for many years. The use of (former) coal mines was rejected after scientific research. Further research showed that solid rock formations below the (unstable) coal layers can be harnessed to excavate the lower water reservoir for pumped storage, making an innovative underground solution possible. A complete plan was developed, with a capacity of 1400 MW (8 GWh daily output) and a head of 1400 m. It is technically and economically feasible. Compared to conventional pumped storage it has significantly less impact on the environment. Less vulnerable locations are eligible. The reservoir on the surface (only one instead of two) is relatively small. It offers also a solution for other European countries. The Dutch studies provide a valuable basis for new locations.