A parliamentary mission led by Éric Coquerel, a deputy from the Left (LFI) party, estimated that the extreme weather events of the summer of 2026—heatwaves, droughts, and wildfires—cost France around 16 billion euros, according to a report combining data from official sources and professional testimonies. This figure, described as a "provisional estimate," is higher than the 10 to 15 billion euros range mentioned earlier by Monique Barbut, the Minister of Ecological Transition. Coquerel noted that the estimate includes costs of various kinds, which could lead to double-counting, and that there are methodological concerns about its accuracy. The report breaks down the costs into several areas. First, the impact on economic growth was estimated by INSEE, France’s national statistics office, and the Treasury to be about 0.1 percentage points of GDP, or nearly 3 billion euros. Additional public spending, not previously budgeted, is estimated at around 2.5 billion euros. This includes 1.3 billion euros in aid to farmers, 700 million euros for health-related expenses, and at least 300 million euros for fire-related costs. The health costs were estimated using extrapolations from the 2003 heatwave, adding up to around 560 to 820 million euros for EHPADs and other medical-social institutions. For households, the report estimates at least 500 million euros in damages from fires, based on data from France Assureurs, the country's insurance federation. It also estimates up to 800 million euros in increased electricity costs due to the use of fans and air conditioners. The largest single cost comes from the agricultural sector, with losses estimated at around 10 billion euros, according to agricultural unions. After deducting government aid, the mission retained an estimated 8.7 billion euros. The parliamentary mission, launched at the end of August, gathered input from various stakeholders, including ministries, public operators, economists, firefighters, farmers, and insurers. Its findings were presented to the Finance Committee of the National Assembly. The mission also aims to provide an initial estimate of the cost of adapting France to future heatwaves. One of the key recommendations involves adapting France’s 50,000 schools, which would cost about 50 billion euros by 2050, according to the report. To improve future assessments of heatwave costs, the mission suggests entrusting INSEE with annual follow-ups using six dedicated staff members, at a cost of around 4 million euros from 2027 to 2030. The report includes 45 numbered recommendations, such as a 2 million euro research program, strengthening the staff of Météo-France and the National Forestry Office, and increasing the resources of the SDIS. It also proposes a civil protection programming law and the development of a fleet of around twenty amphibious aircraft. On the revenue side, Coquerel suggests a "supplementary tax of 1 euro per night" for four and five-star hotels and palaces. The report estimates that the cost of adaptation will increase significantly if no action is taken, with cumulative costs ranging from 116.30 to 157.65 billion euros by 2030 to 2050, of which 87.38 to 128.18 billion euros would be borne by the State.