Last year I reviewed the Tesla Powerwall and said that the price of this battery needed to drop by 50% to around $1,500 to catch my attention. Since the Powerwall battery was priced at $428/kWh I was hoping to see a price closer to $214/kWh to get me interested. Last week I saw an article about the BioSolar battery that said it might be the “Game Changer” because this battery is estimated to cost $54/kWh. With my current electrical cost of 12¢ per kilowatt hour a 7 kWh battery will save me $0.84 a day. If we make a guess that a 7 kWh BioSolar battery will cost less than a $1,000 then the payback is now 3.26 years versus 9.78 years for the Powerwall. If the Powerwall was a small step forward for green technology then the Biosolar battery is a great leap forward. The cost effectiveness of the BioSolar battery has the potential to make a subsidy-less, solar panel project a financial reality. Since going off the grid is quickly becoming both simple and cost effective, look out utility companies!