http://www.businessspectator.com.au/article/2014/4/4/solar-energy/why-residential-solar-dominates?utm_source=exact&utm_medium=email&utm_content=649135&utm_campaign=cs_daily&modapt= / chart Australia solar PV market concentrated residential rooftops business Green Energy Markets SunWiz SolarBusinessServices solar business services residential systems capacity installed Green Energy Markets residential rooftops markets Europe USA America US China installations business premises mounted ground utility scale utility-scale power stations installed mega Watt MW ground mount utility-scale installations business rooftops homes analysis analyses solar PV output match demand peaks industrial zones offset offsetting network capacity better overall value government subsidies residential installations market policy support upfront rebate small-scale renewable energy certificates STC key factor residential sector structure electricity tariffs households small businesses set rate per kilowatt-hour STC rebate financing cost kWh retail electricity rates industrial plants households kiloWatt kilo Watt bill /