If a significant portion of electricity consumption could be shifted from peak to off-peak (through the use of night rates and smart tariffs) we would need fewer power stations - the older dirtiest power stations could be decommissioned first. Better use of nighttime wind would just be icing on the cake when it happens. The environmental benefits of proper smart tariffs are indisputable.environmental !! I wouldn't be basing my decisisions on that because when wind power is on the system is highly variable. Currently 98% of supply is coming from thermal power stations, circa 10% is coming from renewables (probably hydro mostly) and 9% is being exported (-9% net import) according to the Eirgrid data table
However I agree the current smart tariffs here are a disgrace to the energy companies and regulator, government should be coming down much harder on it.