Recently, Ice Energy, a company that makes an ice-based air-conditioning system (explained below), announced their collaboration with PG&E in California on a $10-million dollar project. The project is called "Shift and Save," and here’s the background: in the middle of the day, when the temperature is the highest, energy demand and the cost of energy is very high. But with Ice Energy’s product, consumers can "Shift and Save" by using energy in the nighttime, instead of the daytime. Daytime energy consumption is the bottleneck, it’s the peak, so energy generation must be sufficient to match peak demand. Interestingly, to the extent demand for peak energy can be permanently reduced, the need for new energy generation (i.e. coal plants) is reduced as well. Nice.
The system consists of a large plastic attachment for commercial air conditioning units that is filled with water, frozen overnight, and used to cool refrigerant during the day. According to Ice Energy CEO, Frank Ramirez, "It stores energy at night, when energy is cleaner to produce, cheaper to buy and easier to obtain, and it makes it available for use during the day." The new hardware costs about $10,500 and weighs about 5,000 pounds when filled with water. It looks very similar to a standard AC unit. Also, there can be an additional retrofitting cost of as much as $10,000 for existing buildings and a minimum $750 cost for new construction. Ice Energy is testing residential models (but another company called Trinity Thermal with the IceCycle has residential models already out right now). Anyone have experience to share?