Why would it be disallowed? That's a useful service to the grid – it's renting energy storage. UK off-peak energy is mostly surplus of wind, while the peak is

Why would it be disallowed? That's a useful service to the grid – it's renting energy storage. UK off-peak energy is mostly surplus of wind, while the peak is burning natural gas. Feeding off-peak energy back to the grid at peak times makes it greener.