To combat climate change, a lot of countries are spending billions on new and different kinds of nuclear reactors.

Sam Altman-backed SMR startup Oklo says it's obtained letters of intent from two major – but unnamed – datacenter providers to deliver up to 750 megawatts of atomic power from its fast fission reactor designs across the US. The commitments bring the firm's planned nuclear build-out to 2.1 gigawatts.

Oklo will work with the data centre companies to deploy its powerhouses in chosen markets. Credit: Caureem via Shutterstock. Oklo, a US-based developer of fast fission power plants, has secured letters of intent (LOIs) with two data centre providers to deliver up to 750MW of low-carbon power.