Advanced Energy Storage
ONtility ProTM provides energy storage sizing and financial analysis for Advanced Energy Storage systems, with or without solar electric (PV) or other renewable energy and energy efficiency measures. Energy storage can be modeled for demand cost management, time-of-use (TOU) energy cost management, and power reliability (backup) applications:
Demand Cost Management ("peak power shaving"): For those electric utility rates which include demand (kW, or power) charges, typically 40 - 70% of a utility bill will be demand charges. As a general rule, demand charges will not be consistently reduced through the installation of renewable energy systems. This is because demand is typically measured by the utility in 15 minute intervals, throughout the day over the entire billing cycle (typically 30 days), and the peak measured demand (kW) during the billing cycle is applied to that month's utility bill to determine demand charges. Therefore, if peak demand occurs when the sun is not shining a solar array will have no effect on demand charges. If peak demand does occur during sunlight hours the simple act of a cloud passing over a solar array can reduce or negate any demand reduction benefits.
Energy storage systems can be used to "shave" peak demand by delivering power under the control of advanced power management systems.
Time-Of-Use Energy Cost Management: Many electric utilities offer time-of-use rates where the price of energy (kWh) changes with the time of day (hour). Typically such rates have relatively expensive "peak period" rates that coincide with peak energy demand on utility grids -- for example, during summer daytime hours when high air conditioning loads place high demand on utility grids.
Energy storage systems can be used to lower the average cost of energy by storing ("buying") energy during inexpensive ("off peak") hours, and delivering ("selling") energy during expensive ("peak") hours.
Power Reliability (backup): allows stored energy to be used for uniterrupted power supply (UPS) applications to provide energy during periods when the utility grid is down.
Other applications for energy storage include off-grid energy storage and frequency regulation.