Reactors you can ship in a container — powering mines, bases, and communities off the grid
Not all energy challenges are about scaling up. For remote mining operations in the Arctic, forward military bases, island communities, industrial facilities in off-grid locations, and emergency power restoration after disasters, the question is not how to power a city but how to provide reliable, dense energy where building a grid is impractical. Nuclear microreactors — compact fission systems producing from under 1 MW up to about 10 MWe — offer an answer that no other clean energy technology can match.
What Is a Microreactor?
The nuclear industry uses ‘microreactor’ to describe reactors at the small end of the modular spectrum, typically producing 1–20 MWe of electrical power. The defining characteristics are factory fabrication and transportability: these reactors are designed to be assembled in a factory, shipped to their destination in standard shipping containers or by aircraft (in some concepts), installed with minimal site preparation, operated remotely or with minimal staffing, and replaced or refueled with a simple module swap. This ‘plug-and-play’ model is fundamentally different from any previous nuclear technology.
Key Technologies
Several distinct microreactor concepts are under development. Westinghouse’s eVinci reactor uses heat pipes — passive, no-moving-part devices that transfer heat through evaporation and condensation — to carry thermal energy from the reactor core to a power conversion system. The design is rated at up to 5 MWe, requires no active cooling pumps (significantly improving safety and reducing maintenance), and can operate for several years between refueling. BWXT’s BANR (BWXT Advanced Nuclear Reactor) is designed around high-assay low-enriched uranium (HALEU) fuel in a compact form factor for defense applications. DOE’s MARVEL (Microreactor Applications Research Validation and Evaluation) reactor, a 100 kWt research microreactor at Idaho National Laboratory, is designed to demonstrate operational features and grid integration capabilities.
The U.S. Military Application
The U.S. Department of Defense has identified microreactors as a strategic priority for powering forward operating bases, military installations in remote locations, and critical infrastructure. Current military bases that rely on diesel fuel for power face significant logistical vulnerabilities — fuel convoys are prime targets for attack, and fuel costs are enormous. Project Pele, a DOD program, has been developing a mobile microreactor concept that can be transported by truck, ship, or cargo aircraft and begin generating power within 72 hours of arrival. Concerns about the security of reactor transportation and safeguards have been central to the program’s design requirements.
Remote Community and Industrial Applications
Beyond the military, microreactors have compelling applications in remote communities and heavy industry. Mining operations in the Canadian Arctic, Greenland, and Alaska face enormous energy costs — diesel fuel flown in by charter aircraft can cost $5–10 per liter, making energy costs the single largest operating expense for remote mines. A microreactor providing stable, cheap baseload power could transform the economics of remote resource extraction. Remote communities in Alaska, northern Canada, and island territories that currently depend on diesel generators face similar economics. In Alaska, some communities pay 50–70 cents per kWh for diesel-generated electricity — compared to 5–15 cents in the contiguous United States.
The Historical Precedent
The concept of small, portable nuclear reactors has historical precedent. The U.S. Army constructed eight small reactors in the 1950s and 1960s, several of them portable or mobile. The PM-1 reactor successfully powered a remote radar station in Wyoming for six years until 1968, providing 1 MWe. At Camp Century in Greenland, the PM-2A produced 1.56 MWe and ran from 1960–64, demonstrating that nuclear power could function in truly extreme environments. Modern microreactors draw on 70 years of advances in materials, controls, and safety analysis to dramatically improve on these early designs.
Oklo, a California-based startup, is pursuing the fastest path to commercial microreactor deployment. Its Aurora ‘powerhouse’ design is a fast reactor using metallic uranium fuel, targeting 1.5–15 MWe output. Oklo received a combined construction and operating license application from the NRC, using an innovative regulatory pathway designed for advanced reactors. The company has secured multiple customers in the defense and industrial sectors. If nuclear microreactors achieve their cost and deployment targets, they represent a genuinely new category of energy infrastructure — not just a small nuclear plant, but a new kind of energy product.