Exploring Last Energy's PWR-20: A Modular Approach to Nuclear Power generator for Data Center

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Last Energy, founded after extensive research by the Energy Impact Center, develops 20 MWe micro modular nuclear power plants aimed at decarbonizing global energy production. By integrating proven reactor technology and a full-service delivery model, Last Energy addresses the critical need for clean, affordable power, highlighting their commitment to increasing access to 24/7 baseload power and creating a scalable clean energy future.

Last Energy's technology is centered around a scalable and modular nuclear reactor called PWR-20, designed for quick deployment and minimal construction at the site. The PWR-20 uses established nuclear technology, similar to what's found in many current power plants, and leverages modular construction where components are pre-built and tested. This approach allows for a small footprint, reduced water usage, and compatibility with various site conditions. The design aims to provide a reliable power solution for both industrial and grid applications.

Last Energy's PWR-20 is a compact, modular nuclear reactor featuring a four-loop pressurized water system with a continuous output temperature of 300°C. It delivers an output of 20 MWe and approximately 80 MWt. The reactor uses standard full-length PWR fuel with less than 4.95% enrichment in a 17x17 array. It boasts a high capacity factor with 95% uptime over a 72-month fuel cycle and less than a 3-month refueling period. Its cooling system involves closed-cycle air cooling with minimal water usage. Structurally, it has a subterranean nuclear island with a low-profile balance of plant measuring 12 meters.

You can read more about their technology here.