This week, Mitsubishi Hitachi Power Systems (MHPS) announced that it planned to build the world's first one-gigawatt (GW) energy storage network. The Mitsubishi and Hitachi joint-venture said the storage network would incorporate several different kinds of energy storage, including renewable hydrogen, Compressed Air Energy Storage, flow batteries, and solid oxide fuel cells.
MHPS has only said that it will be able to deliver 1 GW of power, but it did not specify how the project will be rated in terms of gigawatt-hours.
The project appears to center around an advanced natural gas turbine that will be able to burn renewable hydrogen as well. "MHPS has developed gas turbine technology that enables a mixture of renewable hydrogen and natural gas to produce power with even lower carbon emissions," a press release from the joint venture states. That gas turbine technology will eventually be upgraded, "to use 100 percent renewable hydrogen as a fuel source, which will allow gas turbines to produce electricity with zero carbon emissions."
A project to enrich natural gas with renewably-created hydrogen gas is already in the works in Austria. That project, however, does not appear to have the goal of eventually running on 100 percent hydrogen gas. In Germany, a similar project aims to burn methane derived from hydrogen gas, although that project requires the extra step of methanation.
Another part of the project will include Compressed Air Energy Storage (CAES) in salt caverns near the Intermountain Power Project, where a coal-fired power plant that's slated to close in 2025 currently operates. CAES projects are relatively rare: there is only one commercial facility operating in the US at the moment. The idea is that CAES takes power from the grid when energy prices are low and uses thatRead More – Source
[contf] [contfnew] 
Ars Technica
[contfnewc] [contfnewc]
