What Is Power Generation Economics?

Power generation economics is the analysis of the costs, revenues, and financial incentives that govern investment in and operation of electric generating facilities. It draws from engineering economics, energy policy, and microeconomics to evaluate how different generation technologies compete on cost, when investment in new capacity is justified, and how fuel price volatility and carbon pricing alter the relative attractiveness of competing options. The field is essential to resource planning, wholesale electricity market design, and the evaluation of energy policy instruments such as production tax credits and carbon markets.

The discipline spans both ex-ante analysis, performed before committing capital to a project, and ex-post analysis of operating plants in wholesale markets. It is closely tied to power system planning, regulatory economics, and the operational problems of generation dispatch and unit commitment.

Levelized Cost of Energy

The primary metric for comparing generation technologies on a consistent basis is the Levelized Cost of Energy (LCOE), which represents the per-unit revenue a plant would need to earn over its lifetime to recover all capital, fuel, operating, and financing costs at a specified discount rate. Capital costs are spread over the expected generation output, making LCOE sensitive to both the installed cost per kilowatt and the plant's capacity factor. The U.S. Energy Information Administration's Annual Energy Outlook publishes LCOE estimates across generation technologies annually, providing a widely cited reference for policy and investment analysis. Technologies with negligible fuel costs, such as wind and solar, see LCOE track closely with capital cost reductions, while thermal plants are dominated by fuel and carbon-related operating costs.

Fuel Costs and Operating Economics

For generating units burning fossil fuels, the fuel cost component of the production cost is determined by the heat rate of the unit, which measures how many BTUs of fuel are required to produce one kilowatt-hour of electricity, and the price of the relevant fuel. Natural gas-fired combined-cycle plants have displaced coal in many markets largely because natural gas prices fell sharply with shale production while gas turbines achieved heat rates competitive with the most efficient steam plants. Operating costs also include fixed and variable operations and maintenance, insurance, property taxes, and, in jurisdictions with carbon pricing, the cost of greenhouse gas allowances. The interaction between these cost components and wholesale market prices determines whether an existing plant is dispatched, kept on standby, or retired.

Wholesale Markets and Market Design

In deregulated electricity markets, generators recover costs through revenues earned by selling energy, capacity, and ancillary services in organized wholesale markets. Energy prices in spot markets are set by the marginal cost of the last unit dispatched, which in systems with high renewable penetration is frequently close to zero, depressing revenues for all generators during those hours. The International Energy Agency's Levelised Cost of Electricity Calculator illustrates how policy context, fuel prices, and discount rates translate into technology cost competitiveness across countries. Research published in a critical review of the LCOE concept in Energy Research and Social Science documents how LCOE comparisons can mislead investment decisions when the value delivered by different technologies to the grid is not accounted for alongside cost. Capacity markets, which pay generators for being available regardless of whether they are dispatched, were introduced in several U.S. markets to address the revenue adequacy problem that arises when energy revenues alone are insufficient to sustain investment in reliable dispatchable capacity.

Applications

Power generation economics has applications in a wide range of disciplines, including:

• Electric utility resource planning and integrated resource planning processes
• Wholesale electricity market design and regulatory proceedings
• Investment decisions for new generation projects and plant retirements
• Government energy policy analysis, including production tax credits and carbon pricing
• Power purchase agreement negotiations between generators and offtakers