[astanway]

For wholesale players: yes. If you're a retailer and you buy an electricity future and then only use half of it across your customer base, you sell the remainder at real time prices. And for generator, selling real time power is the entire business model.

For consumers: no, not generally. Some markets have schemes to sell leftover solar power at real time prices, but I believe these are being phased out. Both grids and markets are by and large not set up yet for full two-way markets between consumers and producers.

[makomk]

I believe Octopus Energy in the UK lets people both buy power and sell it back to the grid at time-dependent pricing, though I'm not sure how it works exactly and I'm pretty sure technically they're two separate contracts.