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Which metric compares the cost of storing one kilowatt-hour of energy over system lifetime?
- Energy Density
- Levelized Cost of Storage
- Round-Trip Efficiency
- Power Rating
Answer: Levelized Cost of Storage
LCOS = (Total Lifetime Cost) / (Total Energy Delivered). Enables apples-to-apples comparison of storage technologies considering CAPEX, OPEX, efficiency, cycle life, and degradation. Critical for energy planning and investment decisions in policy exams.