Temperatures are rising across the region and to help keep its customers calm, cool and collected, the Tennessee Valley Authority has readied its electric grid for the expected strain summer temperatures can put on the transmission system. TVA also offers some tips to help “beat the heat” that should work for every household, not only TVA customers. The number one suggestion is to remember summer energy use is usually highest — and rates are at their most costly — between 2 p.m. and 8 p.m., during the warmest part of the day and when people arrive home from work. • Keep things clean when the sun goes down. Refrain from running your dishwasher, clothes washer or dryer during the heat of the day. • Filter it out. Make sure your air conditioner filter is clean — a dirty filter means the air won’t get as cool and the unit uses more power than necessary. • Mom was right … shut those doors! Keep the cool air in by minimizing the amount of times you open and shut your main doors leading outside. Do the same with the refrigerator door. • Do a fan dance. Use ceiling and floor fans to keep air moving in your home — but only when you’re in the room.  • Unplug to power down. Unplug an...