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Last Energy PWR-20 Microreactor Park

Last updated

Haskell County Microreactor Project
Pre-construction

A proposed 600 MW behind-the-meter nuclear power park: Last Energy plans to deploy 30 factory-built PWR-20 microreactors on a 200-acre Haskell County site to provide private-wire baseload power to regional data centers, bypassing ERCOT interconnection entirely except for surplus export. Still in pre-licensing, with an NRC Early Site Permit application in preparation and no construction underway, tracked as a dedicated power-generation asset supporting the county's broader data center buildout, not as a data center itself.

600 MWPlanned power
Developer
Last Energy Inc.
Owner
Last Energy Inc.
Tenant
Multiple regional data centers (unnamed) via behind-the-meter, private-wire power; surplus power to be exported to ERCOT under a submitted grid connection request
Power detail
600 MWe total onsite generation capacity, 30 × PWR-20 microreactor units at 20 MWe / 80 MWt each. This is dedicated behind-the-meter power-generation capacity, not IT load; Last Energy does not itself operate a data center at this site.
Power source
30 factory-built PWR-20 pressurized-water microreactors: 4.95% low-enriched-uranium fuel, standard 17x17 assembly, 6-year core operational life, refueling swap-out in under 3 months; pre-fabricated modules designed to "snap together" on site
Cooling
Closed-air cooling cycle: zero operational water consumption
Compute
N/A: dedicated power-generation asset, not a data center
Construction start
Not publicly disclosed: pending NRC Early Site Permit and licensing
Est. completion
Not disclosed by Last Energy; Haskell County Judge Kenny Thompson told KTAB in March 2025 that summer 2029 is the earliest the park could be operating
Grid strategy
Off-grid
County
Haskell
Nearest city
Haskell
Announced
2025-02-28