4 FAQs about Battery random inspection of energy storage projects

Can FEMP assess battery energy storage system performance?

This report describes development of an effort to assess Battery Energy Storage System (BESS) performance that the U.S. Department of Energy (DOE) Federal Energy Management Program (FEMP) and others can employ to evaluate performance of deployed BESS or solar photovoltaic (PV) +BESS systems.

What are the KPIs of a battery system?

For battery systems, Efficiency and Demonstrated Capacity are the KPIs that can be determined from the meter data. Efficiency is the sum of energy discharged from the battery divided by sum of energy charged into the battery (i.e., kWh in/kWh out).

How are batteries used to reduce utility costs?

Batteries are increasingly being used to reduce utility costs by: Peak shaving: discharging a battery to reduce the instantaneous peak demand . Load shifting: discharging a battery at a time of day when the utility rate is high and then charging battery during off-peak times when the rate is lower.

Why do we need a battery?

Batteries allow the PV energy to be stored and discharged at a later time to displace a higher retail rate for electricity. Utilities are increasingly making use of rate schedules which shift cost from energy consumption to demand and fixed charges, time-of-use and seasonal rates.

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