Investing now in a domestic solar PV panel system before 31st Dec 2015, will guarantee you an income of 12.47p per unit for the next 20 years. Taking into consideration the UK Governments guarantee, your will have one of the most profitable and safest government backed tax free investments available. Investments have one thing in common - the higher the income, the higher the risk, but not all of us are willing to take that risk. Fortunately, there are exceptions and the exception in this case is the government's guarantee on your investment into green power sources.-