Projecting the Effect of Climate Change-Induced Increases in Extreme Rainfall on Residential Property Damages: A Case Study from New Zealand

Motu Economic and Public Policy Research, Motu Working Paper 20-02, 2020

32 Pages Posted: 27 Mar 2020

See all articles by Jacob Pástor-Paz

Jacob Pástor-Paz

Victoria University of Wellington

Ilan Noy

Victoria University of Wellington

Isabelle Sin

Motu Economic and Public Policy Research Trust

David Fleming

Motu Economic and Public Policy Research Trust

Abha Sood

affiliation not provided to SSRN

Date Written: January 2020

Abstract

New Zealand’s public insurer, the Earthquake Commission (EQC), provides residential insurance for some weather-related damage. Climate change and the expected increase in intensity and frequency of extreme weather-related events are likely to translate into higher damages and thus an additional financial liability for the EQC. We project future insured damages from extreme precipitation events associated with future projected climatic change. We first estimate the empirical relationship between extreme precipitation events and the EQC’s weather-related insurance claims based on a complete dataset of all claims from 2000 to 2017. We then use this estimated relationship, together with climate projections based on future greenhouse gases concentration scenarios from six different dynamically downscaled Regional Climate Models, to predict the impact of future extreme precipitation events on EQC liabilities for different time horizons up to the year 2100. Our results show predicted adverse impacts that vary — increase or decrease over time and space. The percent change between projected and past damages — the climate change signal — ranges between an increase of 7% and 8% higher in the period 2020 to 2040, and between 9% and 25% higher in the period 2080 to 2100. We also provide detail caveats as to why these quantities might be mis-estimated. The projected increase in the public insurer’s liabilities could also be used to inform private insurers, regulators, and policymakers who are assessing the future performance of both the public and private insurers that cover weather-related risks in the face of climatic change.

Keywords: Insurance, Precipitation, Climate Change, Extreme Weather-Events, Loss Projection

JEL Classification: Q54

Suggested Citation

Pástor-Paz, Jacob and Noy, Ilan and Sin, Isabelle and Fleming, David and Sood, Abha, Projecting the Effect of Climate Change-Induced Increases in Extreme Rainfall on Residential Property Damages: A Case Study from New Zealand (January 2020). Motu Economic and Public Policy Research, Motu Working Paper 20-02, 2020 , Available at SSRN: https://ssrn.com/abstract=3547769 or http://dx.doi.org/10.2139/ssrn.3547769

Jacob Pástor-Paz (Contact Author)

Victoria University of Wellington ( email )

P.O. Box 600
Wellington, 6140
New Zealand

Ilan Noy

Victoria University of Wellington ( email )

P.O. Box 600
Wellington, 6140
New Zealand

Isabelle Sin

Motu Economic and Public Policy Research Trust ( email )

David Fleming

Motu Economic and Public Policy Research Trust ( email )

Level 1, 93 Cuba Street
P.O. Box 24390
Wellington, 6142
New Zealand

Abha Sood

affiliation not provided to SSRN

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