The Energy Consultant's Guide to a Green Energy Brief


A practical overview of how Combined Heat and Power (CHP) technology can be specified to meet a green energy brief

 When a green energy brief talks about conserving energy, reducing energy costs, reducing CO2 emissions, and improving the reliability of energy supply, energy consultants should consider Combined Heat and Power (CHP), which can generate:

  • Low carbon energy – using fossil fuels, e.g. natural gas.
  • Renewable (zero-carbon) energy – using non-fossil fuels.

How do the credentials of CHP stand up to a green brief?

Combined Heat and Power (CHP) is the simultaneous generation of electrical and heat energy.

  • CHP operates at energy efficiencies of up to 85%
  • It offers energy savings of 30% over conventional generation (power station/boilers)
  • Waste energy is reduced
  • Energy is recycled – CHP heat is utilised instead of being ‘rejected’ to atmosphere
  • Carbon emissions are reduced by up to 30%
  • CHP is a proven and reliable technology – providing sustainability

How to specify Combined Heat and Power (CHP) for optimum efficiency

To achieve optimum energy efficiency, CHP must be sized to match the site’s electrical and heat energy profiles.

  • Energy profiles should include any likely future energy conservation measures.
  • Correctly sized CHP will produce an optimum level of energy and CO2 savings - allowing the scheme to classify as Good Quality CHP.
  • Undersized CHP will mean a shortfall in energy and CO2 savings.
  • Oversized CHP will mean a failure to deliver the energy and CO2 savings that CHP can produce, and the client will not benefit from the business incentives available.
  • Installation design should include good access for long-term operation and maintenance.

Alternative renewable fuel options

Renewable or zero-carbon CHP units are fuelled by:


A gaseous biofuel produced by the biological breakdown of organic matter (biomass), e.g. raw materials such as agricultural plant waste, food waste, manure.


A liquid biofuel produced from natural oils, e.g. rapeseed oil, sunflower seeds, reclaimed vegetable or animal fats.

CHP provides an excellent high-energy solution when installed alongside anaerobic digestion plants producing biogas fuel. The process generates renewable heat and electricity, and may additionally qualify for renewable energy financial incentive schemes:

  • Renewables Obligation Certificates (ROC).
  • Renewable Heat Incentives (RHI).
  • Feed-in Tariff (FiT).


  • CHP can help energy consultants deliver a client’s green energy brief.
  • The green credentials of CHP mean higher efficiencies than conventional energy supplies.
  • The CHP must be correctly sized to achieve its optimum efficiency.

Find out how to save energy & reduce costs in your business. Download The Essential Guide to Small Scale Combined Heat and Power (CHP).


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