[rb808]

One of the differences is that industrial production is paid differently that residential costs. Eg on a Windy and Sunny cool afternoon the spot price of electricity is very low, but residences are charged the flat rate (say 10c), so any energy you generate saves you money. On a hot, windless cloudy day the price is very high but you can buy at 10c. So as a residential customer you can game the system. Industrial Generators can't do that. Its unfair on them and inevitable we'll move to constantly changing residential prices too - some areas already have. Then solar farms will be move efficient (despite transmission)