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Interesting that Hydro is dropping to almost zero at times. I would have though at least some of it would be always going to maintain flow of rivers etc.
by slyall 11y ago
Interesting that Hydro is dropping to almost zero at times. I would have though at least some of it would be always going to maintain flow of rivers etc.
- alricb 11y agoYou can just bypass the turbines to maintain the flow you want. That's one big advantages of Hydro: whether you have a run-of-the-river or a reservoir plant, you can adjust your power output to the demand very quickly.
- DiThi 11y agoIn the official graph it actually goes negative.
- alricb 11y agoProbably because of pumped storage: https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricity https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricit...
- joshvm 11y agoIt's possible that this is pumped storage. A lot of hydro stations are demand-based, they're used to compensate for renewables. So in the graph I would interpret that as the reservoirs being refilled during periods of low demand (the amount of electricity this takes is a lot). From the official REE graph it looks like pumping usually takes place overnight and is powered by nuclear. https://demanda.ree.es/demandaGeneracionAreasEng.html https://demanda.ree.es/demandaGeneracionAreasEng.html If you look at this report, you can see in the annual report that pumping 'costs' around 6GW a year. http://www.ree.es/sites/default/files/downloadable/preliminary_report_2013.pdf http://www.ree.es/sites/default/files/downloadable/prelimina...