I have 10 solar panels on the roof 2 solar thermal for hot water. Got the first tariff going and then saw rates fall so now I would lose money on energy if moving. I am also biding my time over batteries waiting for more progress like many views expressed above! I also have a venting system running on a second water circulating pump as I have old rads and this keeps the house much warmer in the winter. Finally have had the house approved on Domestic Renewable Heat Incentive (RHI) which awards £300 per year. Have therefore reduced my energy costs by over 30% over the past 5 years. So more money to spend on the MOG!