Nuclear Industry Reinsurance Association receives AM Best credit ratings with stable outlook

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Nuclear Industry AM Best ratings

Highlights

NIRA received AM Best credit ratings with a stable outlook, supported by strong balance sheet strength and risk-adjusted capitalisation at the strongest BCAR level.
NIRA's 2025 combined ratio surged to 439% due to two large non-nuclear third-party liability claims after four years of combined ratios between 35% and 66%.
AM Best views NIRA's business profile as limited, but notes strong nuclear insurance demand and adequate prospective performance despite anticipated operating volatility.

Rating rationale and capital position

As reported by AM Best, the assigned ratings are supported by NIRA's balance sheet strength, which the agency assesses as strong, as well as its adequate operating performance, limited business profile and appropriate enterprise risk management.

NIRA's balance sheet strength is backed by risk-adjusted capitalisation at the strongest level under Best's Capital Adequacy Ratio, or BCAR. AM Best says the mutual has limited financial flexibility to recapitalise in the event of a full limit loss, but its available capital is sufficient to more than fully cover two full limit losses for nuclear accidents. The assessment is also supported by a liquid investment portfolio with good asset quality.

Operating volatility and market position

NIRA has a record of adequate operating performance, with an average return on capital and surplus of 2.1% for the five-year period ending in 2025. The mutual reports a combined ratio of 439% in 2025, driven by unfavourable developments on two large claims tied to conventional non-nuclear energy third-party liability risks, after combined ratios of between 35% and 66% in the previous four years.

AM Best expects prospective operating performance to remain adequate, although it says results are likely to stay volatile because of the nature of the risks underwritten. The agency assesses NIRA's business profile as limited, reflecting its modest competitive position in the nuclear reinsurance market as a small mutual reinsurer focused mainly on third-party liability and material damage cover for members. AM Best adds that strong demand for nuclear insurance capacity and suitable geographical diversification of reinsured assets partly offset the mutual's limited profile and the high-risk nature of its business.

In our earlier coverage of sovereign resilience in a higher-rate regime, we noted that persistent geopolitical shocks and elevated fiscal spending can tighten financing conditions and increase refinancing risks for governments. We also highlighted that emerging and frontier markets are especially exposed because debt-service burdens can rise faster than revenue capacity, with energy- and food-price volatility adding pressure to inflation and credit outlooks.

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