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How to store energy?  In old way, ice storage is the only method to store large-scale of energy.    Most applications are on HVAC field \.

In the past 10 years, tesla bring down the cost of battery, therefore NEC(National Electrical COe) changes the chapter 690 to accomodate battery into the solar system.  

However, Ice storage still a low cost method to store energy.  A project can be implemented with all three systems linked at a grid-free location.