Recent announcements that traditional fuel bills are, once again, expected to rise by as much as 15 per cent by the end of 2011 could also drive more domestic consumers to convert their household to renewable energy sources. Since the start of the FeedIn Tariff Scheme (FiTs) in April 2010, demand has steadily risen around the UK for installing solar photovoltaic systems to generate electricity, and which also allows unused stored power to be sold back to the national grid.As wholesale electricity prices have risen by an eye watering 40 per cent in the last 12 months and gas has leapt up by a third in the last two months alone, average annual gas and electricity bills are estimated to top ?