I'd like to see 500 reactors built.
250 power plants, each with two AP 1000 1000MW reactors. Replace every existing coal fired power plant and all existing 1st generation nuclear power plants with one type of reactor design. Then start major upgrades to all existing hydro plants to maximize power output to at least 10% total grid output. A 90% nuclear/10% hydro would be a good energy mix, IMO.
