On Tue, 01 Nov 2011 05:31:12 +0000, The Natural Philosopher wrote:

I have done 2747Kwh to date.

Less energy that we have used from oil for hot water and some
space
heating lately all summer.

Its about 300 litres of oil innit?

Harry has saved the planet from burning four car tankfuls of diesel.

A shade over 10kWHr per litre so more like 270l or nearer three
tankfuls of diesel...

I don't think Harry has ever seriously pushed "saving the planet". It
is purely a financial investment with a "guaranteed" return of about
10% over 20 years. Without factoring in rising grid prices.

--
Cheers
Dave.