thanks for your reply.i will submit this as response. excerpt from energy storage article. " Demand for electricty from the worlds various grids varies over the course of the day and from season to season.For the most part, variation in electric demand is met by varying the amount of electrical energy supplied from primary sources. Increasingly, however, operators are storing lower cost energy at night, then releasing it to the grid during peak periods of the day when it is more valuable.In areas where hydroelectric dams exist, release can be delayed until demand is greater. This is not storing "surplus" energy produced elsewhere, but the net effect is the same.Renewable supplies with variable production, like WIND and SOLAR POWER. tend to increase the net variation in electric load, INCREASING the oppurtunity for grid energy storage." It goes on to state that PORTABILITY is the area of greatest success for current energy storage technologies. Is ASPW getting their share, i am betting on it. time will tell