Electric dryers aren't 100% efficient if the source is the usual gas/coal/nuke/etc steam plant because the plant itself is only ballpark 50% efficient at conver

Electric dryers aren't 100% efficient if the source is the usual gas/coal/nuke/etc steam plant because the plant itself is only ballpark 50% efficient at converting the heat->electricity, then you take a percent or ten in transmission losses/etc. So, if the choice is pump the gas to a combined cycle gas plant, burn it, transmit the electricity to a resistivity heating dryer vs pump the gas directly to the dryer and burn it, the gas dryer will generally win. Using a heat pump returns much of what is lost, but on balance in most places its sorta a wash. To be specific you have to look at the whole picture including the energy source, which requires actually picking a location/city and a particular product. And even saying maybe 100% of your power comes from PV+Wind (yah righ, haha) if you really want to lower the footprint the best plan is just to hang your cloths outside.