On Sun, 2 Dec 2018 12:06:04 +0000, RJH wrote:

Well I did too - thinking such systems had backup. Do solar/wind
systems really have no electricity storage or alternative source?

The alternative source is nuclear or gas. Energy from such sources
is offset by excess supply (from the renewable source) when the
weather is favourable - it all works on long term averages not
minute by minute details. In the long term energy requirements can
be met by renewables even if sometimes energy is being supplied to
the grid by other sources.

https://www.ofgem.gov.uk/node/101644
https://www.ofgem.gov.uk/environment...ut-rego-scheme