Levelized Cost of Electricity (LCOE)

The engineering

LCOE flattens a plant's whole cash-flow life onto one number: the constant price per MWh that would exactly pay back capital (at your discount rate), fixed and variable O&M, and fuel over the economic life. This card uses the NREL simple-LCOE form — capital annualized by the capital recovery factor, spread over the energy a kW actually produces at the stated capacity factor.

Capacity factor is the lever people underestimate: halving CF doubles the capital and fixed-O&M components, which is why a cheap-per-kW peaker can still be the most expensive energy on the grid. Sanity check the CRF too — at 7% over 25 years it should land near 0.086/yr; a CRF above ~0.15 usually means you typed the rate as a decimal instead of a percent.

The simple form ignores degradation, tax treatment, and time-varying fuel prices. For financing-grade numbers use a full discounted cash-flow model; use this card to rank options and catch order-of-magnitude errors before the spreadsheet stage.

Where this math comes from

Levelizing costs is old regulated-utility arithmetic: rate-of-return commissions needed a way to compare a coal plant's heavy capital against a gas turbine's heavy fuel bill, and annualizing capital with a fixed-charge rate did the job. EPRI codified the method for the whole US industry in its 1979 Technical Assessment Guide (TAG), which gave every utility planner the same discounting rules and made 'busbar cost' comparisons routine.

The metric went public in the renewables era. NREL published its simple LCOE calculator and methodology so wind and solar could be scored against thermal plants on equal footing, and Lazard's annual LCOE analysis — first issued in 2008 — turned the number into the industry's standard talking point, charting solar's fall from over $350/MWh to grid-competitive in barely a decade.

1. 1979EPRITechnical Assessment Guide standardizes levelized busbar cost methodology for US utilities.
2. 1983IEA / NEAFirst joint 'Projected Costs of Generating Electricity' applies levelized costing across countries.
3. 1995NREL (Walter Short et al.)'Manual for the Economic Evaluation of Energy Efficiency and Renewable Energy Technologies' pins down the simple-LCOE form this card uses.
4. 2008LazardLaunches its annual LCOE analysis — the de facto public benchmark for generation costs.

See the full timeline of the math behind every calculator →

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