From the “twice as expensive, half as reliable” department comes this paper from SPRINGER where they seemed to have figured out (finally) that wind and solar just isn’t all that good for reliable power. Their solution? Overbuild. To me, that’s laughable, because regional weather patterns (such as a rex block high) can easily shut down not just dozens, but thousands of wind systems over a large area. Likewise, a persistent low pressure system (such as a cutoff low) can make clouds and rain over a wide area for an extended period, making solar power next to useless. It doesn’t matter how many wind and solar plants you build, weather will still make it unreliable at times. – Anthony
100 percent renewable energy sources require overcapacity
To switch electricity supply from nuclear to wind and solar power is not so simple
Intermittent sources are, by definition, unsteady. Therefore, a back-up system capable of providing power at a level of 89% of peak load would be needed. This requires creating an oversised power system to produce large amounts of surplus energy. A day storage to handle surplus is ineffective because of the day-night correlation of surplus power in the winter. A seasonal storage system loses its character when transformation losses are considered; indeed, it only contributes to the power supply after periods with excessive surplus production.
The option of an oversized, intermittent renewable-energy-sources system to feed the storage is also ineffective. This is because, in this case, energy can be taken directly from the large intermittent supply, making storage superfluous. In addition, the impact on land use and the transformation of landscape by an unprecedented density of wind convertors and transmission lines needs to be taken into consideration. He also warns of the risk that it will intensify social resistance.
F. Wagner (2017), Surplus from and storage of electricity generated by intermittent sources, Eur. Phys. J. Plus 131: 445, DOI 10.1140/epjp/i2016-16445-3