In 1922, the Tennessee Power Company merged with several other entities to form the Tennessee Electric Power Company (TEPCO). TEPCO tripled the capacity of Great Falls Dam by raising the dam and installing a second generator at the powerhouse downstream. The dam faced its first major test in March 1929, when several cloudbursts atop the Cumberland Plateau caused the Caney Fork to expand to record flood volumes, sending wreckage and uprooted trees crashing into the dam. The Great Falls Power House was flooded and a substation was destroyed, but the dam held.