Zinc Based Fuel Cell

"Zinc-air batteries (non-rechargeable), and zinc-air fuel cells, (mechanically-rechargeable) are electro chemical batteries powered by the oxidation of zinc with oxygen from the air. These batteries have high energy densities and are relatively inexpensive to produce. They are used in hearing aids and in experimental electric vehicles. They may be an important part of a future zinc economy."

Source: http://en.wikipedia.org/wiki/Zinc-air_battery

"Wind turbines and solar arrays are being developed at a rapid rate, but they are inherently variable generators of energy and are thus classified as un-dispatchable resources. This greatly reduces the market price of generated electricity. By integrating the operation of the Zinc Flow with that of the renewable resource, a stable and predictable output can be generated, allowing for higher-value, firm contract sales as well as energy pricing arbitrage opportunities."

Source:http://www.premiumpower.com/reg.php

The increasing demand for renewable resources is on the way, zinc being a key component would also have more demand increasing the price of the recyclable resource. - (edit / improve)