The key technologies for a stable energy system
Green and grey electricity storage systems are key components of a modern, flexible electricity system. Both generally use the same technical basis – usually high-performance lithium-ion battery storage systems – but differ in the origin of the stored electricity and in their role within the energy sector.
Green electricity storage
These storage systems are charged exclusively using renewable energy, such as that from wind turbines or photovoltaic systems. They enable locally generated green electricity to be physically stored and made available at a later time.
A green electricity storage system can, for example, be connected directly to any type of renewable energy plant and absorb surplus energy that would otherwise have to be curtailed. This increases the actual utilisation of the electricity generated from renewable sources.
Grey electricity storage
Grey electricity storage facilities are technically identical, but draw their electricity from the general grid. They therefore store an energy mix that may contain both renewable and conventional components. Their main function is to provide flexibility: they buffer peak loads, stabilise the grid frequency and support grid operators during bottlenecks.
Such storage facilities are often built at strategic points on the grid to relieve pressure on regional grid sections or to reduce the need for redispatch measures.
Broader significance within the energy system
Green and grey electricity storage systems complement each other perfectly:
- Green electricity storage increases the proportion of renewable energy that can actually be utilised and strengthens regional energy strategies.
- Grey electricity storage systems ensure the necessary system stability and flexibility in the wider grid.
That is why we at Stadtwerke Kaiserslautern generally consider wind and photovoltaic installations in conjunction with green electricity storage systems, whilst also pursuing the use of grey electricity storage systems. Together, these two storage systems form the basis for an energy system that remains reliable, efficient and sustainable despite volatile generation.
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