# Combined heat and power: Overview

One fuel, two products: electricity and the heat it leaves

Source page: https://www.materialinsights.org/energy/e_chp/overview/

What this tile covers Making electricity and useful heat (and cooling) from the same fuel. Share of use 2.5% share of final energy use supplied (2019)

Share of world final energy use (about 435 EJ, the same denominator as Conversion and use) supplied by recovered or reused energy, where a global figure exists; most methods have no global total and are left null Useful heat from CHP plants estimated at about 10.9 EJ in 2019: heat, solar thermal and geothermal reached about 15.0 EJ of final energy (3.6% of 418 EJ) less 4.1 EJ from heat-only plants (calculated, upper side since solar and geothermal are included; on-site industrial CHP heat for own use is not counted). Divided by world final energy use of about 435 EJ, about 2.52% (calculated). Overlaps waste-to-energy and bio-cogeneration plants that sell heat. Source: [Key World Energy Statistics 2021](https://iea.blob.core.windows.net/assets/52f66a88-0b63-4ad2-94a5-29d36e864b82/KeyWorldEnergyStatistics2021.pdf), International Energy Agency.

#### Key facts

| **Heat grade** | All grades |
|---|---|

#### Included from the reference tables

- CHP / cogeneration
- Trigeneration (CCHP)
- Absorption and adsorption chillers
- Micro-CHP

#### Also in Heat to power and cogeneration
[WHR Waste-heat power (steam Rankine)](https://www.materialinsights.org/energy/e_whr_rankine/)[ORC Organic Rankine, Kalina and sCO2 cycles](https://www.materialinsights.org/energy/e_orc/)[Trb Engine exhaust recovery](https://www.materialinsights.org/energy/e_engine_recovery/)[Bag Bagasse and black-liquor cogeneration](https://www.materialinsights.org/energy/e_bio_cogen/)[CDQ Steel plant energy recovery](https://www.materialinsights.org/energy/e_steel_recovery/)

Explore paths from here
 More on this tile in the tabs above: science and thermodynamics, engineering and integration, economics and contracts, impact and additionality, what to track.

## Other sections

- [Summary](https://www.materialinsights.org/energy/e_chp/index.md)
- [Correlation](https://www.materialinsights.org/energy/e_chp/correlation/index.md)
- [Science and thermodynamics](https://www.materialinsights.org/energy/e_chp/rc-sci/index.md)
- [Engineering and integration](https://www.materialinsights.org/energy/e_chp/rc-eng/index.md)
- [Economics and contracts](https://www.materialinsights.org/energy/e_chp/rc-econ/index.md)
- [Impact and additionality](https://www.materialinsights.org/energy/e_chp/rc-impact/index.md)
- [What to track](https://www.materialinsights.org/energy/e_chp/tracking/index.md)
- [Relationships](https://www.materialinsights.org/energy/e_chp/links/index.md)