GroNaS is the abbreviation for “Großer Natrium-Schwefel-Speicher” (large sodium-sulfur storage). We have specifically designed our concept to completely replace the fossil fuel industry. Our Concept makes it possible to store really large amounts of electricity without the costs spiraling out of control.
- Power capacity: 20 – 1000 MW
- Storage capacity 2 – 28 weeks: To ensure a secure electricity supply, we need storage facilities that can supply electricity for two weeks at a time. For future heating production: throughout the entire winter.
- Compact design: A GroNaS storage plant, including the tank facility for the energy carrier materials, fits on the site of a coal-fired power plant that is no longer needed.
- Energy carrier materials: Sodium and sulfur. Practically unlimited availability. It would be no problem to store several times the annual electrical energy production of the entire world with these materials.
- Efficiency: 85% – 90%.
- Emission-free operation.
- Environmental impact and operational risk: Low. The risks are comparable to those of an oil refinery.
- Storage price: approx. 0.1 €/kWh.
- Electricity production price in a network of wind and solar power plants: 0.16 €/kWh. Coal-fired power plants currently cost 0.21 €/kWh. With storage according to our concept, the price of electricity will therefore fall again.
As part of our development work, we further want to reduce the plant price for GroNaS storage plants. The goal is to store electricity in summer and to use it to operate heat pumps in winter at heating costs similar to those for gas.