Elon Musk and Tesla Inc (NASDAQ: TSLA) may have found their biggest competitor in energy storage today when Siemens (NASDAQOTH: SIEGY) and AES Corp (NYSE: AES) joined forces to form Fluence. It’s an “energy storage technology and services company that combines the expertise, vision, and financial backing of the two most experienced icons in energy storage,” playing off the confluence of technologies upending the energy industry today.