[ZeroGravitas]

When you say "is already deployed" are you saying that you have a heat pump already and that it is set to run based on when the excess electricity is available?

How much is left after that usage?

If you fit an EV charger for future use you could allow access to friends/neighbours at the specific times until you need it yourself.

[mogoman]

I have a heat pump driven boiler and I do run it when the excess is available - it uses 500W, so I'm still left with a potential 2-2.5kW. I can of course set the boiler hotter, but then I'm just wearing out the components to lose the heat at night (since I don't need so much hot water).

I do have an EV charger, but no nearby neighbours yet with EVs.

However "sharing the excess" is an interesting idea, since everyone needs electricity. I could run an extension cable to the neighbour and let him run his washer/dryer from it at peak times.