My cynical side was quick to point out that I would fire up my crypto miners if electricity was free for a few hours a day. After talking to him more I realized we both had different take aways from the story of "the tragedy of the commons" I lightened the conversation up by informing him he could do folding from home for a few hours to make sure his excess power went to a noble cause & thwart my zero sum approach.
The heating is provided via hot water radiators that are not at all adjustable, there are no thermostats in individual apartments! So if the weather is not very cold, your apartment can become too hot. While it's still sub-freezing outside.
Newer apartment buildings have adjustable radiators with thermostatic valves, but it's far from common.