WASHINGTON, July 21 – NASA’s plan to test a nuclear thermal rocket engine for deep-space travel has hit a familiar snag: the price tag keeps climbing. According to a new report from Politico, the estimated cost for the nuclear thermal propulsion flight demonstration has swelled to $2 billion – a notable jump from earlier internal projections. Back in 2023, NASA’s own baseline for the project stood at $1.5 billion.
By late 2024, that figure had risen to $2.1 billion, driven by four specific factors. Think of it like remodeling a house: you uncover a cracked foundation and suddenly need a new floor plan.
For the rocket, the foundation involves low-enriched uranium fuel. Fabrication costs for that fuel have gone up. The agency also needs a brand-new test stand at the Nevada National Security Site, estimated at $350 million.
Meanwhile, labor costs at the Marshall Space Flight Center have risen, and engineers made design changes to the reactor core to meet safety standards. The $2 billion figure reported by Politico is a significant increase from earlier projections.
But in plain terms, what does that buy? A ground test readiness date currently set for 2028, with a potential flight launch in 2032. Delay that schedule by a year, and the project adds an estimated $150 million to the tab.
Putting the price in perspective
It helps to compare this with what NASA has spent before. The old NERVA nuclear rocket program, which ran from 1955 to 1973, cost about $1.4 billion over 18 years – that’s roughly $10 billion in 2025 dollars when adjusted for inflation. The Mars 2020 Perseverance mission, by contrast, cost $2.7 billion over its entire lifecycle.
And the International Space Station? That came in at $150 billion over 30 years.
The practical upshot: the $2 billion for NTP represents about 0.8% of NASA’s FY2025 budget of $25.4 billion. Small, but not trivial. The project currently employs approximately 800 people directly across NASA centers and contractor facilities.
Each year of delay adds an estimated $150 million to project costs.
What’s still missing from the budget
Here’s the catch that could matter most for taxpayers and Mars enthusiasts alike. The Politico report notes that the cost estimate does not include any costs for integrating the NTP stage with a crewed Orion spacecraft or a Mars lander. That integration work would add billions more.
So the total lifecycle cost, including a potential second demonstration flight, could exceed $3 billion. So what’s next?
Watch the 2028 ground test milestone. If that slips, the $150 million-a-year delay penalty kicks in. For now, the project continues with its 800 workers, trying to keep a lid on costs while the design gets safety approvals.
It’s a classic space-program tension: go fast, go safe – but either way, the bill keeps growing.
