Last mentioned: Mar 6, 2026
Target Completion
Expected date for reactor completion and initial grid synchronization.
Target Operation
Estimated date for the reactor to begin commercial power generation.
Permit Approval
The NRC officially grants the commercial construction permit, the first since 2016.
Permit Issued
The NRC grants the first commercial construction permit for an advanced reactor.
Site Preparation
Non-nuclear construction and site grading begin at the Kemmerer location.
Application Submitted
TerraPower formally submits its construction permit application to the NRC.
Permit Application
TerraPower submits a formal construction permit application to the NRC.
Site Selection
TerraPower and PacifiCorp announce Wyoming as the location for the Natrium demonstration project.
Project Announcement
TerraPower and PacifiCorp announce Kemmerer, Wyoming as the site for the first Natrium reactor.
The U.S. Nuclear Regulatory Commission has issued its first commercial nuclear construction permit since 2016, greenlighting a next-generation reactor project in Wyoming. This milestone marks a significant shift in U.S. energy policy toward advanced nuclear technology as a solution for decarbonizing the power grid.
The U.S. Nuclear Regulatory Commission has granted the first commercial construction permit for an advanced, non-light water nuclear reactor in decades. The permit allows TerraPower to begin building its Natrium reactor in Kemmerer, Wyoming, marking a critical milestone for the next generation of American carbon-free energy.
This page surfaces every story mentioning PacifiCorp across our climate coverage. We track each entity's appearance over time so readers can trace how the narrative evolves — which developments are isolated incidents, which build into longer arcs, and which reframe how operators in the space think about the entity. Story selection uses the same multi-source verification gate applied across the rest of our coverage.
Read our editorial methodology for how we identify, deduplicate, and score entity references. Our glossary defines the technical terms used across stories on this page, and our trends index contextualizes individual developments against the longer-running climate beat. Cross-entity comparisons live on our compare view.
| What you see | What it tells you |
|---|---|
| Story count | Number of distinct stories where PacifiCorp was a primary or referenced actor. |
| Recency clustering | Whether mentions are concentrated in a recent window (a news cycle) or distributed (a sustained arc). |
| Sentiment distribution | Aggregate sentiment of the stories mentioning this entity, weighted by impact score. |
| Cross-niche links | When the same entity surfaces in our sibling networks, we link to those views to enrich context. |