Costs on an energy storage capacity basis ($/kWh) vary widely depending on the storage technology, quantity to be stored and whether it is mobile (e.g., in cars, ships, or aircraft) or stationary applications. For example, the incremental cost of storage at an existing salt dome facility is extremely low– perhaps on the order of $1/kWh, compared with liquid hydrogen storage on spacecraft. Some stationary pressurized hydrogen storage costs for a range of projects compiled in 2005 is illustrated below.
Capital costs quoted for compressed hydrogen storage facilities, based on a 2005 analysis. Energy units are based on lower heating value of hydrogen. Adapted from Systems Analyses Power to Gas: Deliverable 1, DNV KEMA, June 20 2013, Figure 23, p. 69.