I'm using Octopus mentioned in the article, I got paid £0.67 to use 12.62kWh over 4 hours due to spare energy in the UK on 8th June. So not really worth it financially, but the ability is there already to help even out the load.
>>yuumei+(OP)
You didn’t just get 67p, you also got the utility of that energy. For my EV, that’s a good 40 miles of range. That’s about £8 in equivalent petrol cost.