Biomass heating - very good where mains gas is unavailable or if you have a reliable supply of fuel. We fitted the Atmos DC25GS 25kw gasifying log boiler and an Akvantti Akvaterm 2000 litre accumulator tank. The system uses thermal store technology.
Solar thermal - outstanding performance when the weather is sunny but even on cloudy days this has provided >100% of our hot water since installation in June.
Dislikes: Greenwash - particularly companies who talk about energy conservation but don't follow words with deeds.
I am sceptical about ASHP and GSHP. They are marketed as energy saving systems and even qualify for grants from the government. This is wrong. It is true that they produce useful heat from unpromising low grade heat and are very efficient at doing this. But they do this using electricity - which has probably been generated by burning gas! The gas should be used as a primary energy source not for burning to generate electric. Worse still, all over the country people are abandoning their efficient gas condensing central heating boilers and installing heat pump systems because gas prices have increased.
We get electricity from Good Energy. Good Energy have a wind farm at Delabole and buy power from a large number of independent renewable generators who use small scale hydro electric, wind and photovoltaic systems. That is their business model. The only other green electricity company is Ecotricity. Ecotricity put their profits into building new wind turbines and every year the proportion of their renewably generated electricity increases. The do supply 'brown' electricity at present but use the profits to build new wind turbines. They do offer a 100% renewable electricity tariff.
Contrary to a lot of the myths that can be read in the press (or on internet forums) 'green' electricity is not significantly more expensive than conventionally generated 'brown' electricity.
Start with draughtproofing and insulation. Every pound you spend on insulation and draughtproofing will, if installed carefully, save you money and save energy. This is one area where I encourage people to think about the payback. Insulation will pay for itself again and again but it will also make your home feel more comfortable.
Do the minimum in terms of buying new equipment and having lots of work done. Being sustainable doesn't mean buying lots of expensive equipment. Take a holistic approach and look at how much energy you could save just by cutting back, turning down the thermostat, switching things off.