this post was submitted on 16 Nov 2024
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About 115% to 130%. Depending on diversification of renewable sources and locations. The remains are losses in storage and transport obviously.
But shouldn't you actual question be: How much storage is needed?
For a quick summary of those questions you can look here for example...
What would 130% grid uptime even look like? 475 days a year without blackout?
I think we're talking about different things.
130% production on average, with excess being stored, minus losses in conversions, transport and storage = 100% demand covered all the time.
Or the longer version: For a stable grid I need to cover 100% of the demand in next to real-time. This can be achieved with enough long- and short-term storage, plus some overproduction to account for storage losses. The 115% to 130% production (compared to actual demand) are based on studies for Germany and vary by scenario, with the higher number for the worst case (people strongly resisting all changes to better balance consumption and south Germany keeping up there resistence to diversify by only building solar while blocking wind power).
The question now is: How much storage do I need? And that answer is varying by much greater amount based on scenario (for example between 50 and 120 GW capacity needed as electrolysis for long term-storage or battery storage between 50GWh and 200GWh).