Peruse the data on Anunnaki technology. They directed and stored electricity and atomic power. They used advanced computing and communication devices dedicated to their possessors.
For building, they moved huge stones with sonar transporting devices. They had advanced cutting machines and also liquefied then solidified stone and poured metal staples between building elements to keep them interlocked through earthquakes. The Anunnaki employed fighters, bombers and weapons of mass destruction.