Industrial heating is one of the solutions to the problem, because a lot of processes are not that time-critical. Some processes already require electricity, such as arc furnaces. However, as the process cost is dominated by the electricity usage, they are already being run at times when the electricity cost is very low, that is, when there is overcapacity. This makes it easy to absorb overproduction of a grid which is intentionally oversized for peak demand. It's already not unheard of for industries to get paid to consume electricity.