Norway's uniform flood insurance heavily subsidizes high-risk properties
A Norges Bank working paper quantifies cross-subsidies in Norway's uniformly priced natural perils insurance scheme. It finds that high-risk properties are substantially subsidized, particularly for flood risk.
Flood zones face 65x higher fair premiums
The paper quantifies cross-subsidies in Norway's natural perils insurance, where a uniform premium is charged regardless of location-specific natural hazard risk.
Focusing on households and flood risk, the study estimates that the actuarially fair premium in flood zones would be about 13 times higher than the uniform flood premium charged today.
This difference is even more pronounced when compared to non-flood zones, where the fair premium would be approximately 65 times lower than in flood zones.
Specifically, the estimated actuarially fair premium in flood zones is 0.2278 per mille, while outside flood zones it is 0.0035 per mille.
For a typical home in a flood risk area insured for 5 million NOK (approximately 480,000 USD), this translates to an annual flood premium of nearly 1,140 NOK (109 USD) under risk-based pricing, compared to around 85 NOK (8.2 USD) under the current uniform flood premium.
This substantial gap illustrates the extensive redistribution of costs, with lower-risk households implicitly subsidizing flood-related losses in high-risk zones.
The analysis draws on a comprehensive dataset covering 2.6 million residential properties in Norway, including detailed geographic coordinates, insured values, hazard zone maps from the Norwegian Water Resources and Energy Directorate (NVE), and municipality-level insurance payouts from 1980 to 2024.
Collective responsibility, distorted incentives
Norway's natural perils insurance scheme employs uniform pricing, aiming for collective responsibility and affordable coverage.
This solidarity-based system, however, leads to substantial cross-subsidization: high-risk properties receive implicit subsidies, while low-risk properties pay premiums above their actuarially fair levels.
This design, while ensuring universal coverage, creates a moral hazard by weakening incentives for households to adapt, invest in mitigation, or avoid building in hazard-prone areas.
As climate change increases weather-related hazards, the magnitude of these cross-subsidies and their behavioral consequences are likely to intensify.
The study focuses on flood risk, which accounts for approximately one-third of historical insurance payouts, using municipality-level data from 1980 to 2024 to approximate expected losses.
Efficiency vs. solidarity: A growing dilemma
The findings highlight a fundamental trade-off between efficiency and distribution in natural perils insurance.
While uniform pricing ensures broad risk-sharing, it simultaneously impedes effective adaptation by reducing incentives for risk mitigation.
As climate change exacerbates natural disaster risks, this tension will become increasingly critical for policymakers designing future insurance schemes.