Mexico is fighting 159 active wildfires across the country amid the year’s second heat wave that has also put the nation’s power grid under stress. Mexico’s national weather service issued an alert that at least 12 states would experience temperatures higher than 45°C (113°F), with large swathes of the rest of the country expected to see temperatures higher than 30°C. [time-brightcove not-tgx=”true”] The heat wave has increased demand for power, prompting the country’s grid operator to declare the system in a state of emergency on Thursday evening for the second time this week.