Eliminating combustion of natural gas in livable areas improves the indoor air quality and improves overall safety associated with fires and gas leaks. A 2002 study by the California Seismic Safety Commission found that damaged gas infrastructure caused 20 to 50 percent of post-earthquake fire ignitions. Buildings with electric heating are allowed a larger winter baseline quantity of electricity. All-electric homes have electric heat pump appliances (such as water heaters, air conditioning and heaters) are 4-5 times more efficient than equivalent natural gas appliances. All-electric buildings can more effectively utilize on-site solar generation, required in the 2019 Building Code.