Even in the Darkness?

There has been an interesting development concerning solar farms in the UK. They apparently have a mechanism called an 'inverter' and this can be used, even on the darkest night, to smooth electricity supplies (https://www.theguardian.com/environment/2019/nov/24/solar-farms-keep-uk-lights-on-at-night). On windy nights, there is likely to be a combination of massive electricity generation by wind turbines but a relatively weak demand for power. The solar farms would be able to ameliorate  damaging supply surges.