Energy could be stored in ground. Osmotic power. Osmotic power or salinity gradient power is the energy available from the difference in the salt concentration between seawater and river water.
Two practical methods for this are reverse electrodialysis (RED) and pressure retarded osmosis (PRO). Both processes rely on osmosis with ion specific membranes. The key waste product is brackish water. This byproduct is the result of natural forces that are being harnessed: the flow of fresh water into seas that are made up of salt water. The method of generating power by pressure retarded osmosis was invented by Prof. Solar panel costs 'set to fall' The fall in cost is due to the increased lifetime, the institute says The cost of installing and owning solar panels will fall even faster than expected according to new research.
Tests show that 90% of existing solar panels last for 30 years, instead of the predicted 20 years. According to the independent EU Energy Institute, this brings down the lifetime cost. The institute says the panels are such a good long-term investment that banks should offer mortgages on them like they do on homes.