Efficient transfer of electrical energy — from generating power plants to electrical substations and then to consumers — has to be efficient and reliable. Blackouts can happen anytime without warning. Some of the largest companies in the world have suffered losses of up to hundreds of millions of dollars due to disturbances lasting for a few seconds or even milliseconds. Ultracapacitor energy storage can be the ideal solution for different power quality issues, including magnitude, flicker, dip, swell, and interruption events, because of their ability to react practically instantly.