Can't be everything. Electrical power is like 20-35% or so of total power used in most countries. I just checked some statistics of the Umweltbundesamt, the German ~environment protection office. The electrical fraction is suprisingly low! Though it's supposed to increase because most renewable energy production is electric.
My guess is nuclear energy, more efficient cars, better insulated houses, and less heavy industry.
One of the interesting things demonstrated there is that you really don't want to be generating most of your electricity from imported oil during a global oil shock.
My guess is nuclear energy, more efficient cars, better insulated houses, and less heavy industry.