The graph is of annual electricity generation, so it almost certainly is not included. Natural gas used for residential heating doesn't get converted to electri

The graph is of annual electricity generation, so it almost certainly is not included. Natural gas used for residential heating doesn't get converted to electricity, it just gets burned by the home's furnace. Only around a third of homes in the US use electricity for heating. https://www.eia.gov/todayinenergy/detail.php?id=18131 https://www.eia.gov/todayinenergy/detail.php?id=18131