Pea sized stones heated to 600°C in large, insulated steel tanks are at the heart of a new innovation project aiming to make a breakthrough in the storage of intermittent wind and solar electricity.
What is Denmark's largest battery?
The electricity generated from the Vestas test turbines in Østerild find its way cross country to this site. The battery system was developed in-house by the Vestas Storage and Energy Solutions team and has a capacity of 2.3 MWh, which makes it Denmark's largest battery, but hopefully not for long.
This vision poses challenges for the grid to be stable and reliable. The objectives of the project are to generate hands-on experience of developing and operating battery energy storage systems (BESS) in the renewable energy-based power system of the future. Two large scale batteries of 0.4 MW/0.1 MWh and 1.2 MW/0.4 MWh will be tested and operated.
How much does thermal storage cost?
Not clear what that even means. “The total specific cost of the thermal storage materials, including storage tanks, insulation, etc. is expected to be less than 10 EUR per kWh for serial production systems. In comparison, conventional battery storage systems typically have storage capacity costs in the range of 200 EUR per kWh.”
How much does a battery storage system cost?
In comparison, conventional battery storage systems typically have storage capacity costs in the range of 200 EUR per kWh.” What one gets directly out of a charged battery is direct current electricity. It's electricity ready to go into an inverter to push AC electricity onto the grid.
How long do you store fossil fuels?
If you store for 10 weeks, then you are getting just 5 stock turns a year, or 1/73rd of the earning potential of a daily requirement.. Store the excess energy by making synthetic fossil fuels that will be burned in all the requisite “green energy” backup fossil fuel generators. Of course when the synthetics run out, burn fossil fuels.
Why do storage projects have surpluses?
Because maximum generation can occur at both high and low demand, surpluses are much less certain and also highly variable. That tends to stretch storage projects beyond viability when attempting anything more than short term output smoothing and grid stabilisation..