# Carnot batteries: Overview

Turning electricity into hot and cold, then back again

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

What this tile covers Electricity stored as heat and cold, then turned back into electricity. Share of use <.01% share of world stored energy (2024)

Share of the world's stored energy (energy capacity held, TWh, latest year 2019 to 2026) across the forms with figures, about 22,551 TWh; fuel stocks dominate. Battery and other stores count capacity, not state of charge Pilot scale only; SPIC's 1 MW / 4 MWh pilot is used as the order of magnitude. Near zero.

#### Key facts

| **Duration** | Hours to days |
|---|---|

#### Included from the reference tables

- Pumped thermal electricity storage

#### Also in Thermal
[SHS Sensible heat storage](https://www.materialinsights.org/energy/e_sensible_heat/)[PCM Latent heat and cold storage](https://www.materialinsights.org/energy/e_latent_heat/)

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

## Other sections

- [Summary](https://www.materialinsights.org/energy/e_carnot/index.md)
- [Correlation](https://www.materialinsights.org/energy/e_carnot/correlation/index.md)
- [Science and technology](https://www.materialinsights.org/energy/e_carnot/sg-sci/index.md)
- [Engineering and performance](https://www.materialinsights.org/energy/e_carnot/sg-eng/index.md)
- [Economics](https://www.materialinsights.org/energy/e_carnot/sg-econ/index.md)
- [Impact and additionality](https://www.materialinsights.org/energy/e_carnot/sg-impact/index.md)
- [What to track](https://www.materialinsights.org/energy/e_carnot/tracking/index.md)
- [Relationships](https://www.materialinsights.org/energy/e_carnot/links/index.md)