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green energy uk buy combined heat and power from a tomato grower in Hertfordshire

Types of green energy


A solar cell or more precisely a photovoltaic cell takes the light from the sun and converts it into power. Solar thermal systems take the heat from the sun and use that to heat water for homes. In the UK due to our unpredictable weather photovoltaic power is more commonly used.


Biomass is produced from organic material, either directly from plants or indirectly from industrial, commercial, domestic or agricultural products.

Biomass falls into two categories:

  • Wood biomass includes forest products, waste wood and energy crops like elephant grass and quick-growing trees like willow. We also buy energy created from burning waste wood.
  • Non-wood biomass includes animal waste and biodegradable food products like vegetable oil.


We buy electricity generated from small-scale hydro-electric schemes currently based in Cumbria, Cambridgeshire and the Peak District. Hydro-electric power plants take the energy from free falling water and turn this energy into electricity.

Cleaner CHP

Combined heat and power (CHP) is the simultaneous generation of heat and power (usually electricity) in a single process. CHP is a highly efficient way to use both fossil and renewable fuels. The process is green and Climate Change Levy exempt.

Most of the CHP we buy comes from two very different sources

  1. Industrial- Electricity is generated by growers of tomatoes and peppers. They burn gas to heat their green houses or to actually produce Carbon Dioxide to enrich the growing atmosphere of the plants. This green electricity produced is a useful by product that the nurseries can’t use so sell back to us at green energy uk where it is fed into the grid for others to use.
  2. Residential- A CHP plant supplies heating to a grid of insulated hot water pipes that carry heat around a building often public or private sector flats. Meanwhile, the electricity generated is used within the communal areas or is exported to the electricity grid.

Anaerobic digestion

Anaerobic digestion is a renewable energy source because the process produces a methane and carbon dioxide rich biogas suitable for energy production helping replace fossil fuels. Also, the nutrient-rich solids left after digestion can be used as fertiliser.


Small scale wind takes the energy in the wind and uses it to turn a turbine that creates electricity.