How much does a heat wave cost? Insurers and CEOs want to know.
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The property information firm Cotality, previously known as CoreLogic, recently started offering heat-hazard modeling on its widely used risk-analysis platform. And Mercer, a unit of Marsh & McLennan Cos Inc., in May launched a climate health cost forecaster tool evaluating how extreme heat and other risks could impact companies' health insurance costs. It draws on historical incidence data, medical claim codes associated with climate events, and published research.
'The health cost is but one of many,' said Tracy Watts, Mercer's US leader for health care policy. 'You've got increased workers' compensation cost, disability issues, life insurance, absentee issues.'
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These newer tools follow the emergence of hedging instruments like weather derivatives, forward contracts, and parametric insurance. Using a forward contract, for example, a utility might agree to buy extra electricity from a producer at a certain price for the summer. If temperatures stay low, they lose; if they soar, they win. Parametric insurance pays out only if predetermined physical criteria are reached — say, temperatures above 95 degrees Fahrenheit for five days running.
'I think when we look more closely at extreme heat,' said Garrett Bradford, a principal at Milliman Inc., an actuarial and management consulting firm, 'we will find the risk often isn't taken sufficiently into account' in insurance, 'and the downside of a major heat event is potentially significant.'
Last year was the hottest ever recorded, and the United States has experienced deadly heat waves this decade such as the 2021 heat dome in the Pacific Northwest that killed hundreds of people. Heat waves in US cities have become more frequent and the heat season has gotten longer, according to the US Environmental Protection Agency.
As doctors and public officials tackle the rise in dangerous health effects, there are early efforts to assess heat's financial toll. In California alone, the state found in a study published last year that seven extreme events over a 10-year period from 2013 to 2022 caused $7.7 billion in economic harm, including $44 million in lost milk production from a single 2017 heat wave in the Central Valley. (Cows produce less milk in very hot conditions.)
One challenge for predicting a heat wave's impacts, said Anand Srinivasan, a Cotality executive who develops climate change-related products, is that heat damage is relatively complex to model. Many different variables determine its impact. For starters: How long does the heat wave last? Is it dry or wet heat? Does it cool down at night? And the risks are industry-specific. A business with an outdoor workforce has much more to worry about than one whose employees have air conditioning.
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As of last year, Cotality models not just 'acute' perils like wildfires and floods but also 'chronic' ones: extreme heat, drought, cold waves, and extreme precipitation. The first edition of its chronic-peril modeling tool offers risk indices for heat down to an address level but doesn't estimate the monetary impact of a heat event.
'What we can do is provide the analytics and data for people,' Srinivasan said. 'That way, a typical [company] risk manager would say, 'OK, do I keep my office open during this heat wave? What kind of extra support do I need to provide to my personnel?''
Srinivasan said he expects modeling of heat waves' financial consequences, industry by industry, will follow eventually.
The data firm Skyline Partners, which has offices in Colorado and the UK, has developed metrics for a custom parametric insurance policy covering dairy cows stressed by heat. Laurent Sabatié, Skyline's cofounder and executive director, said figuring it out required a 'substantial amount of analysis.'
Wildfire and hurricane models have been 'commoditized' to a certain extent, he said, but heat prediction is still 'bespoke' since it is industry-specific as much as place-based.
In the past, insurance companies have sometimes perceived changes in climate risk too late and ended up paying out dearly after outsized events. Two examples are Hurricane Andrew in Florida in 1992 and Northern California's Camp Fire in 2018. In both cases, insurers sustained losses far outside the expected parameters; each disaster led to investments in far more accurate modeling of hurricanes and wildfires, respectively (and then in higher premiums for customers).
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The technology to run a full hazard analysis on heat for any industry or city is there, said Cole Mayer, who runs parametric products for Aon Plc, a risk management firm. But clients' appetite to pay for more insurance is still limited. 'There's a risk perception evolution that needs to happen,' Mayer said.
AI and crypto, with their dependence on heat-sensitive data centers, may propel the growth of the market, he adds: 'These are exposures that didn't exist to the same extent 10 years ago.'
Dave Bigelow, a climate risk adviser for Aon, thinks time alone will do it. 'We've got hundreds of years of records of floods and hurricanes and acute perils,' he notes. 'But for heat, we're just starting to see it' in the data.
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Get Starting Point A guide through the most important stories of the morning, delivered Monday through Friday. Enter Email Sign Up Advertisement The property information firm Cotality, previously known as CoreLogic, recently started offering heat-hazard modeling on its widely used risk-analysis platform. And Mercer, a unit of Marsh & McLennan Cos Inc., in May launched a climate health cost forecaster tool evaluating how extreme heat and other risks could impact companies' health insurance costs. It draws on historical incidence data, medical claim codes associated with climate events, and published research. 'The health cost is but one of many,' said Tracy Watts, Mercer's US leader for health care policy. 'You've got increased workers' compensation cost, disability issues, life insurance, absentee issues.' Advertisement These newer tools follow the emergence of hedging instruments like weather derivatives, forward contracts, and parametric insurance. Using a forward contract, for example, a utility might agree to buy extra electricity from a producer at a certain price for the summer. If temperatures stay low, they lose; if they soar, they win. Parametric insurance pays out only if predetermined physical criteria are reached — say, temperatures above 95 degrees Fahrenheit for five days running. 'I think when we look more closely at extreme heat,' said Garrett Bradford, a principal at Milliman Inc., an actuarial and management consulting firm, 'we will find the risk often isn't taken sufficiently into account' in insurance, 'and the downside of a major heat event is potentially significant.' Last year was the hottest ever recorded, and the United States has experienced deadly heat waves this decade such as the 2021 heat dome in the Pacific Northwest that killed hundreds of people. Heat waves in US cities have become more frequent and the heat season has gotten longer, according to the US Environmental Protection Agency. As doctors and public officials tackle the rise in dangerous health effects, there are early efforts to assess heat's financial toll. In California alone, the state found in a study published last year that seven extreme events over a 10-year period from 2013 to 2022 caused $7.7 billion in economic harm, including $44 million in lost milk production from a single 2017 heat wave in the Central Valley. (Cows produce less milk in very hot conditions.) One challenge for predicting a heat wave's impacts, said Anand Srinivasan, a Cotality executive who develops climate change-related products, is that heat damage is relatively complex to model. Many different variables determine its impact. For starters: How long does the heat wave last? Is it dry or wet heat? Does it cool down at night? And the risks are industry-specific. A business with an outdoor workforce has much more to worry about than one whose employees have air conditioning. Advertisement As of last year, Cotality models not just 'acute' perils like wildfires and floods but also 'chronic' ones: extreme heat, drought, cold waves, and extreme precipitation. The first edition of its chronic-peril modeling tool offers risk indices for heat down to an address level but doesn't estimate the monetary impact of a heat event. 'What we can do is provide the analytics and data for people,' Srinivasan said. 'That way, a typical [company] risk manager would say, 'OK, do I keep my office open during this heat wave? What kind of extra support do I need to provide to my personnel?'' Srinivasan said he expects modeling of heat waves' financial consequences, industry by industry, will follow eventually. The data firm Skyline Partners, which has offices in Colorado and the UK, has developed metrics for a custom parametric insurance policy covering dairy cows stressed by heat. Laurent Sabatié, Skyline's cofounder and executive director, said figuring it out required a 'substantial amount of analysis.' Wildfire and hurricane models have been 'commoditized' to a certain extent, he said, but heat prediction is still 'bespoke' since it is industry-specific as much as place-based. In the past, insurance companies have sometimes perceived changes in climate risk too late and ended up paying out dearly after outsized events. Two examples are Hurricane Andrew in Florida in 1992 and Northern California's Camp Fire in 2018. In both cases, insurers sustained losses far outside the expected parameters; each disaster led to investments in far more accurate modeling of hurricanes and wildfires, respectively (and then in higher premiums for customers). Advertisement The technology to run a full hazard analysis on heat for any industry or city is there, said Cole Mayer, who runs parametric products for Aon Plc, a risk management firm. But clients' appetite to pay for more insurance is still limited. 'There's a risk perception evolution that needs to happen,' Mayer said. AI and crypto, with their dependence on heat-sensitive data centers, may propel the growth of the market, he adds: 'These are exposures that didn't exist to the same extent 10 years ago.' Dave Bigelow, a climate risk adviser for Aon, thinks time alone will do it. 'We've got hundreds of years of records of floods and hurricanes and acute perils,' he notes. 'But for heat, we're just starting to see it' in the data.
