Perhaps I don't understand the grid properly. I thought the average frequency was always maintained at 50Hz over a 24 hour period. Having the frequency dip belo

Perhaps I don't understand the grid properly. I thought the average frequency was always maintained at 50Hz over a 24 hour period. Having the frequency dip below 49.9Hz would normally be exceptionally rare. I mean, if the alternative is a blackout, having heating turned off for a few minutes over a 24 period would be preferable to a nationwide blackout? It's not as if people would suddenly freeze to death anyway. Just curious if someone who understood this better had a good explanation for why this might be a bad idea.