The Microgrid Way: Going Green with Solar
The cost of the supercapacitor-based storage is slightly higher than the cost of lithium ion on a per-kWh basis, says Ghani. The company expects to
Capacitance plays an important role as an indispensable energy storage system in the microgrid. As a new type of energy storage device, supercapacitor has become one of the preferred devices for microgrid energy storage with its irreplaceable superiority. The microgrid consists of micro power supplies, loads, energy storage, and energy managers.
Within the United States, it is currently challenging to acquire the supercapacitors appropriate for grid applications. A large part of the cost of supercapacitors comes from the active carbon material that is produced from char (incomplete combustion of natural gas and oils) and biochar products.
High capital cost and low energy density of supercapacitors make the unit cost of energy stored (kWh) more expensive than alternatives such as batteries. Their attributes make them attractive for uses in which frequent small charges/discharges are required (e.g., ensuring power quality or providing frequency regulation).
Supercapacitor-based energy storage, on the other hand, is much simpler. This technology stores energy on the surface of the electrolyte, which means there is no chemical reaction. “Electrical energy comes in and is stored as electrical energy. It releases electrical energy back into electricity when discharged,” Ghani explained.
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