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Biomass boilers generally use wood pellets which can be gravity fed or blown into the boiler. Space of 1 to 2 cubic metres is required for storage. The alternative is wood burning stoves which require a source of logs most likely from a nearby forest.

[link to the biomass page on the KITH website]

Renewable electricity
Solar cells and wind turbines are the principal sources of renewable electricity. Solar cells, generally in the form of photovoltaic modules or tiles, are usually mounted on the roofs of buildings that have a suitable south facing orientation, or on a flat roof with a similar orientation. The electricity generated can be used by the occupants and any surplus exported via the electricity grid; conversely electricity can be obtained form the grid if demand exceeds supply.

[link to the photovoltaic systems page on the KITH website]

Wind turbines generate electricity by the movement of air turning the blades to which the shaft of a generator is attached. Large turbines can supply electricity to communities whilst small sized turbines and can be mounted on a pole or on top on ones roof.

[link to the wind turbine on the KITH website]
[link to encouraging renewable energy sources]

Centralised versus dispersed energy production
One hundred years ago all energy production was localised – electricity was generated at point of use primarily by wind turbines whilst oil and paraffin was available in containers. Windmills or watermills were also used to grind wheat to produce flour.

Windmill Watermill


 

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