# Thermochemical storage: Overview

Storing heat as chemistry so it keeps for a whole season

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

What this tile covers Reversible reactions that soak up heat and give it back later. 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; the SaltX pilot of 0.5 MW / 10 MWh is used as the order of magnitude. Near zero.

#### Key facts

| **Duration** | Days to seasons |
|---|---|

#### Included from the reference tables

- Metal oxides
- Salt hydrates
- Calcium looping

#### Also in Chemical
[H2S Hydrogen storage](https://www.materialinsights.org/energy/e_h2_storage/)[NH3 Ammonia, methanol and e-fuels](https://www.materialinsights.org/energy/e_efuels_store/)[SPR Fuel stocks and strategic reserves](https://www.materialinsights.org/energy/e_fuel_stocks/)[BmS Biomass and biofuel stores](https://www.materialinsights.org/energy/e_bio_store/)[Exp Explosives and propellants](https://www.materialinsights.org/energy/e_propellants/)

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