Why It Matters

A CORE POWER (US) Inc. terminated its lobbying relationship with Invariant LLC effective April 1, 2026, according to a Lobbying Disclosure Act (LDA) filing signed June 18, 2026. The termination represents a shift in how the maritime and advanced nuclear technology company manages its Washington advocacy efforts.

CORE POWER is a private, venture-backed company that operates at substantial scale within its sector, though its revenue figures are not publicly disclosed and it remains in the pre-revenue or early-revenue stage of development. The termination filing amount was $0, providing no direct measure of what the relationship had cost the company in recent periods.

The filing does not indicate whether CORE POWER hired another lobbying firm to continue work on the same issues. The termination alone provides no evidence of whether the company shifted to a different advocacy approach, reduced its lobbying footprint, or engaged other representatives for the issues Invariant LLC previously handled.

Broader Context

The timing of the LDA termination CORE POWER filed coincides with significant activity in the advanced nuclear energy space at the federal level. CORE POWER is a member of the Nuclear Energy Maritime Organization (NEMO) and participates in collaborative research efforts with substantial government backing.

CORE POWER participates in the Molten Chloride Reactor Experiment (MCRE) project as a technical cost-share partner. The project involves collaboration between CORE POWER, Southern Company, TerraPower, and the U.S. Department of Energy. The federal investment in this work has been substantial: the U.S. Department of Energy invested over $45 million in cost-shared funds for the MCRE project and awarded over $136 million through its Advanced Reactor Demonstration Program (ARDP) for the MCRE project. CORE POWER raised $100 million to fund its share of the approximately $600 million MCRE government program.

Beyond the MCRE partnership, CORE POWER engages directly with the U.S. Nuclear Regulatory Commission (NRC) in pre-licensing activities. The NRC must address significant regulatory questions around CORE POWER's core technology. The NRC must develop licensing frameworks for floating nuclear power plants and maritime nuclear propulsion under 10 Code of Federal Regulations (CFR) Part 50/52/53. This regulatory work occurs independently of lobbying relationships and represents ongoing engagement between the company and federal agencies.

CORE POWER launched the 'Liberty' Program, a U.S.-anchored maritime civil nuclear program, in early 2025. The Liberty Program aims to bring floating nuclear power to U.S. markets by the mid-2030s. This initiative represents a major push into the American market for the company's flagship focus on building markets for nuclear energy in ocean transportation and heavy industry.

The Bottom Line

The filing provides no information about whether CORE POWER hired another lobbying firm to replace Invariant LLC or what skills a successor firm might bring to bear on the company's advocacy priorities. The filing documents only the termination itself, not any subsequent hiring decisions.

The termination of the lobbying client relationship with Invariant LLC occurred as CORE POWER pursues these ambitious commercialization goals. Whether the company continues advocacy work through other channels or shifts its engagement strategy remains undisclosed in available records.

Access the Legis1 platform for comprehensive political news, data, and insights.

Spot something wrong? Report an issue with this article