We fitted solar hot water to the lodges (DIY, evacuated tubes) and over the last 18 months looks like we have halved the electricity bills for these. Have just fitted (spring 2010) solar HW on the cottage - harder job as the roof is higher and is slate. It works really well as south facing. Then comes the house - higher still and old slate...
We have planning permission for an 11Kw Gaia wind turbine - should power the whole farm - all the properties.

We run a farm for wildlife and have 3 self-catering eco-lodges and a cottage that pays our way for this. We are very passionate about shrinking our footprint and about improving the land for local habitat and wildlife. We have a small area of SSSI on the farm. We are just sttarting on a new eco lodge converting an old cowshed. www.wheatlandfarm.co.uk

DIY solay hot water is easy if you can do that sort of thing and hugely worthwhile. Last week the hot water was at 36 degrees C before the immersion had to start work. In the summer it does the lot. Costs about £1500 per install if DIY.
June 2010 the 220litre HW tank was at 65 degrees C and only because I set it not to get hotter than that.