December 4 (Renewables Now) - Constriction begins this month in Hamburg-Altenwerder of a wind energy storage system using rock fill, Siemens Gamesa Renewable Energy SA (BME:SGRE) said Thursday.
The facility will be able to provide 30 MWh of electric energy at 600 degree Celsius.
The wind turbine maker is partnering in the project with utility Hamburg Energie GmbH. It said that commissioning of the "Future Energy System - FES" heat-storage unit, at the Trimet SE aluminum smelter site, is planned for the spring of 2019.
In markets where the penetration of renewables, such as wind and solar power, is high, storage acts as a buffer between times of high and low supply. The project in Hamburg-Altenwerder involves the construction of a ferroconcrete giant to hold 800 cu m of rock-fill with a mass of 1,000 tonnes, all that covered with a thick layer of thermal insulation. Excess power produced by wind turbines will be stored in the form of heat there and will be released when needed using a steam turbine to produce electricity. The 1.5-MW generator can produce energy for up to 24 hours.
Siemens Gamesa has been involved in research and development on the heat-storage system for about three years. One of its key findings is the optimised shape of the storage container with the rock fill. It will be round with a decreasing diameter at both ends, where the inflow and the outflow openings are positioned.
After comprehensive testing, the energy storage facility will be operated in collaboration with Hamburg Energie. It will test the commercial opportunities of the storage-technology in the energy markets.