HTGR — High-Temperature Gas-Cooled Reactor

Reactor technology overview and global count

HTGR stands for High-Temperature Gas-Cooled Reactor. Helium-cooled, graphite-moderated design running at high outlet temperatures, which suits industrial heat as well as electricity. China’s HTR-PM is the most recent commercial example. In the WhereNuc dataset there are 5 recorded HTGR units across 3 countries, of which 1 are operational. Their combined net operating capacity is about 200 MW. The earliest recorded HTGR unit entered commercial operation in 1967, the most recent in 2023.

Countries using HTGR reactors

Common HTGR models

Other reactor types