Micro Reactors the Next Generation of Power

What Makes Micro Reactors Different

The nuclear power plants that have served the electric industry for decades are large, complex, and capital-intensive — typically exceeding 1,000 megawatts and costing billions of dollars to construct. Micro reactors represent a fundamentally different approach: compact, factory-manufactured units generating between 1 and 20 megawatts of electricity, designed for rapid deployment, remote locations, and eventually for use by distribution utilities and electric cooperatives. While large nuclear plants are the province of large utilities and power authorities, micro reactors may ultimately be within reach of smaller utilities seeking carbon-free, reliable baseload power.

Technology and Current Development Status

Multiple micro reactor designs are in various stages of development in the United States, with companies including Oklo, Ultra Safe Nuclear Corporation, and Kairos Power advancing toward regulatory approval and demonstration. The U.S. Department of Energy and the military have invested substantially in micro reactor development, recognizing the technology's potential for remote and resilient power supply. Commercial deployment for civilian electric utilities is expected in the late 2020s to 2030s, pending NRC licensing and demonstration project results. Key design features include passive safety systems that do not require operator intervention, long refueling cycles of 5–10 years or more, and factory fabrication that reduces on-site construction costs.

Accounting Treatment Under FERC USoA

For utilities that eventually invest in micro reactors, the FERC Uniform System of Accounts provides the framework for recording the investment. Nuclear generation plant would be recorded in the Nuclear Production Plant accounts (Accounts 320–325). Construction costs during development and licensing phases would be accumulated in Account 107 (Construction Work in Progress — Nuclear), with AFUDC accruing on qualifying expenditures during the construction period. Decommissioning obligations — required for all nuclear facilities — will require careful application of ASC 410 (asset retirement obligations).

Rate-Making Implications

Micro reactor investments, like all capital investments, will need to be recovered in customer rates through depreciation expense and a return on rate base. The capital cost per kilowatt for early deployments is expected to be higher than comparable solar or wind, reflecting the novelty of the technology and the small scale of early units. However, micro reactors offer firm, dispatchable power without the intermittency challenges of wind and solar — a significant value in a grid increasingly dependent on variable renewable resources. Rate cases for utilities with micro reactor investments will need to address these economic tradeoffs clearly for regulators and boards.