Here in Germany we commonly have negative electricity prices at exchanges and with a increasingly higher percentage of renewable energy is will only become more

Here in Germany we commonly have negative electricity prices at exchanges and with a increasingly higher percentage of renewable energy is will only become more common. It would be very easy to use the energy to heat up warm water in the already existing warm water boilers just by adding a cheap electric heating element to the usual gas burner. The necessary smart meters for billing are actually mandatory in new installations. However with current consumer electricity prices completely removed from the large scale exchanges and more expensive than ever I don't see that happening right now.