Australie: pour atteindre 70% de solaro-éolien une puissance de stockage égale à 30% de la puissance solaro-éolienne suffit. Pour 100% de solaro-éolien, il faudrait une puissance de stockage égale à 100% de la puissance solaro-éolienne, ce qui serait absurde. Il vaut mieux faire appel à un système de back-up thermique et hydraulique standard.
Exactly how much storage and back-up does renewable energy need? It’s a question at the heart of electricity planning and the subject of many of the myths peddled by vested interests in the fossil fuel lobby and the gullible media. The answer is: not nearly as much as the naysayers would have you think (...)
The analysis indicates that up until 80 per cent wind and solar share, less than five hours of battery storage at average state load is required to support energy balancing working together with the existing dispatchable technologies such as hydro and gas.
It notes that gas or biogas peaking plant will be more cost effective than adding additional storage capacity in circumstances where a substantial renewable generation shortfall extends for more than a third of a day – underlining the point that battery storage is best for short periods.
“Solar provides a relatively economic and predictable daytime supply in all states,” it says. “However, a significant contribution from wind power is crucial to fill in the supply gaps at night together with storage and dispatchable gas capacity.”