Define the levelized cost of energy (LCOE) and its use in comparing energy sources.

• A. LCOE is the average lifetime cost per unit of electricity generated, accounting for construction, operation, and financing; used to compare technologies.
• B. LCOE is the maximum possible energy output.
• C. LCOE is the instantaneous cost of fuel.
• D. LCOE measures the environmental impact of a plant.

Answer: (A)

LCOE represents the average cost to produce one unit of electricity over the lifetime of a generating asset, incorporating capital cost, operations and maintenance, fuel (if applicable), financing charges, and decommissioning, all brought to present value. This creates a common basis for comparing different energy technologies that have different lifetimes and cost structures. It helps answer which option will produce electricity at the lowest average cost over its life, rather than focusing only on upfront costs or fuel costs. Keep in mind, LCOE is a cost metric and does not by itself capture variability in output, reliability, grid value, or environmental impacts unless those factors are added separately.