There is no doubt that rooftop solar systems are seen as a threat to incumbent utilities – be they they generators suffering from lower demand or network operators finding their business model under threat.
Most of the scenarios generated for the development of rooftop solar, such as that by the CSIRO Future Grid forum, suggest the development of in-home battery storage that could enable householders to shift their peaks, store energy for night-time or even, one day, go off grid.
But another proposal involves a different way of thinking about this – using storage, in this case compressed air, to create a sort of “solar bank” that would allow householders to deposit surplus electricity, and either draw down for their own use or lend it out to others.
The proposal comes from General Compression, a Boston-based company which is developing and trialling technology that allows excess output to be stored as compressed air in large caverns.
General Compression argues that its proposal avoids the pitfalls of rooftop solar created when too much strain in put on the network when the sun goes down, or from too much electricity being sent back to the grid.
But what if a single bulk energy storage facility could act like a bank for thousands of distributed solar system owners, suggests Peter Rood, the development manager from General Compression.
A network connected storage project would allow multiple customers to “deposit” energy into the bank during the day when they have excess generation and later “withdraw” that energy when the sun goes down.
Read more at http://cleantechnica.com/2013/12/18/creating-solar-energy-bank/#8XV1VeDRoeQXUWD2.99