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Combined Heat and Power (CHP)

A combined heat and power (CHP) unit is a plant for cogeneration, in which electricity and usable heat are generated simultaneously. By using the input energy twice, a CHP unit achieves a particularly high overall efficiency.

How a CHP unit works

A combustion engine or a turbine drives a generator to produce electricity. The waste heat that is generated in the process is not discharged unused, but is used for heating, hot water or industrial processes. This principle significantly increases energy efficiency compared with the separate generation of electricity and heat.

Use in industry and commerce

In commerce and industry, a CHP unit is frequently used to:

  • reduce energy costs
  • increase the share of self-generated electricity
  • improve security of supply
  • reduce CO₂ emissions through efficient use

Combination with energy storage systems

In combination with an electricity storage system or energy storage system, the electricity generated can be used flexibly or buffered for later use. This makes it possible to reduce peak loads and optimise self-consumption.


Frequently Asked Questions (FAQs)

What is a combined heat and power (CHP) unit?

A combined heat and power unit is a cogeneration plant that generates electricity and heat simultaneously and thereby achieves a high overall efficiency.

How does a CHP unit work?

A CHP unit generates electricity by means of an engine or a turbine, while the waste heat that is produced is used for heating or industrial processes.

Why is a CHP unit attractive for businesses?

With a CHP unit, businesses can increase their energy efficiency, reduce energy costs and become more independent of the electricity market, as electricity and heat are generated on site.

How can a CHP unit be combined with a battery storage system?

A battery storage system can buffer surplus electricity from a CHP unit and make it available again later in order to reduce peak loads or market electricity flexibly.

Is a CHP unit a renewable energy plant?

A CHP unit is not automatically renewable. It can be operated with fossil fuels such as natural gas or with renewable energy sources such as biogas.