Appalachian Power conducted a yearly test of its hydroelectric facility near Smith Mountain Lake, operating it at maximum output to assess its capacity during periods of high electricity demand, such as heatwaves, which can strain the grid and prompt regional grid operators like PJM to request additional power generation. The test aimed to ensure reliable power supply during peak demand periods, while also advising residents in the area, including boaters, of potential water level surges due to the increased water flow through the turbines.