The heatwave is causing a rise in power demand across much of the Western part of the country, a region that's already experiencing drought, Axios reported. The heat will dry soils further and raise power demand, which comes at a time of decreased output at hydroelectric plants, Axios reported. NBC News reported that many cities are expected to hit new records for high temperatures this week. About 40 million will experience temperatures over 100 degrees, NBC reported. Even cities that sit at high altitudes in the mountains like Grand Junction, Colorado and Billings, Montana are expected to stay past 100°F this week, NBC reported. Las Vegas's National Weather Service reported that they're forecasting 10 daily records to be broken this week.Axios reported that during a period of high heat in Southern Nevada that lasted from June to early July 2013 nearly 30 fatalities and over 350 heat-related injuries as well as temporary power outages were reported.