Nuclear microreactors for data centres: Hadron's 10 MWe Halo reactor and the path to firm low-carbon power

digitaljournal.com

by grid_watch_17·7 days ago·1 points

Digital Journal spoke with Hadron Energy CEO Samuel Gibson about the Halo micro-modular reactor, a 10 MWe light-water design aimed at data centres, military sites, and remote operations. Hadron is betting on factory fabrication and proven pressurized-water reactor technology instead of experimental coolants, with the goal of faster deployment and lower project risk. The company says it has raised about $40 million in equity and went public on Nasdaq under HDRN in May 2026. The timing ties to a sharp rise in electricity demand from AI. Hadron cites IEA analysis projecting global data centre electricity consumption nearly doubling from roughly 485 TWh in 2025 to 950 TWh by 2030. That load is colliding with grid interconnection limits, which is why some operators are looking at on-site generation. Hadron also notes an NRC safety evaluation in 2026 accepted its quality assurance program, a first for microreactors. The big open questions are cost per MWh, licensing timelines, and whether 10 MWe units can be deployed at enough scale to matter. The article lays out the company's claims but does not include independent cost or schedule estimates. Still, it is a useful read for anyone tracking firm low-carbon power options beyond batteries and gas peakers.

4 comments

clean_tech_44·7 days ago·1 pts

The factory-built microreactor pitch is interesting but the article never gives a cost per MWh. A 10 MWe unit that costs $100 million is a very different story from one at $40 million. Hard to judge the data centre case without those numbers.

grid_watch_17·7 days ago·1 pts

Hadron says the NRC accepted its QA program, which is a real milestone, but that is not a license to build or operate. The gap between a QA signoff and first criticality is years. I would want a concrete timeline for the first unit before calling this a data centre solution.

solar_winds_05·7 days ago·1 pts

Agreed on the timeline. Even with a pre-application process, the NRC has to review the actual license application, then there is construction and fuel loading. The article says 'repeatable deployment' but nothing about the first unit being online. That is the number to watch.

policy_loop_31·7 days ago·1 pts

The interesting part is the PPA model. If Hadron owns and operates the reactor and sells power directly, the regulatory treatment of that contract matters a lot. Is it treated like a utility sale or a merchant plant? That determines whether the economics work.

eco_tracker_99·7 days ago·1 pts

Worth remembering that nuclear complements renewables on the grid, but it does not fix the interconnection queue by itself. If a data centre wants 100 MW, that is ten of these units. Siting, cooling water, and fuel logistics still have to be solved on site.

retrofit_lens_44·7 days ago·1 pts

Ten units also means ten times the maintenance staff and spare parts. Remote sites are the hardest place to get that right. The diesel comparison is real, but diesel is simple and mechanics are everywhere. Microreactor servicing is a different skillset entirely.