ELECTRIC ENERGY STORAGE (EES)
APPLICATIONS & BENEFITS
Electric energy storage (EES) technology has the potential to facilitate the large-scale deployment of variable renewable electricity generation, such as wind and solar power, which is an important option for reducing GHG emissions from electric power producers.
Solar and Wind power emit no carbon dioxide (CO2) during electricity generation but are also variable or intermittent electricity sources.
Solar power only produces electricity when the sun is shining and Wind power only when the wind is blowing, thus the output of these sources varies with sunshine intensity and wind speeds.
In combination with renewable resources, energy storage can increase the value of photovoltaic (PV) and wind-generated electricity, making supply coincident with periods of peak consumer demand.
In remote areas diesel engines are generally the source of power. These diesel engines operate for the most part inefficiently as the load reduces to a fraction of maximum rating. The integration of power storage greatly improves electricity delivery efficiencies, reduces diesel consumption, O&M, emissions and extends diesel life. Project payback can be as short as 2 years. As fuel costs rise, the economics improve.
Energy storage systems can be used to follow load, stabilize voltage & frequency, manage peak loads, improve power quality, defer upgrade investments, and support renewables. The side chart shows the power and discharge time requirements for a variety of storage applications in the utility industry.
ENHANCED POWER QUALITY
Energy storage can provide “ride-through” for momentary outages, and extended protection from longer outages. Coupled with advanced power electronics, storage systems can reduce harmonic distortions, and eliminate voltage sags and surges.
ELECTRICAL STORAGE TECHNOLOGIES