It’s worth noting that at least one of those is being kept open against the operator’s wishes, as it’s no longer profitable to operate. That’s how ridiculous these people are about coal.
If an incumbent US Senator's electability depends upon a single coal power plant they're already in deep shit.
On the other hand for House reps the elections are every two years like clockwork, "after they win election" is in effect never because they will already be thinking about re-election, so if that's what they're asking for they mean never.