The data shows the efficiency of several energy storage technologies in 2015. During this year, flywheels had a maximum efficiency of 95%. Flywheels are a mechanical method of energy storage.
Super capacitor | 80 | 98 |
SMES | 80 | 95 |
PHS | 70 | 85 |
CAES | 40 | 75 |
Flywheels | 70 | 95 |
NaS battery | 70 | 90 |
Li-ion battery | 85 | 98 |
Flow battery | 60 | 85 |
Hydrogen | 25 | 45 |
SNG | 25 | 50 |