What Are Power Markets?

Power markets are organized systems through which electricity is bought and sold, with prices set through competition among generators and other suppliers rather than through cost-of-service rate regulation. They encompass wholesale markets, where bulk electricity is traded between generators, utilities, and large customers, and retail markets, where competitive suppliers sell directly to end consumers in jurisdictions that have opened retail choice. Power markets coordinate the dispatch of generating resources, compensate capacity to ensure adequate supply, and provide price signals that guide long-run investment in generation and transmission infrastructure.

The restructuring of vertically integrated electric utilities into competitive markets began in earnest in the United States and parts of Europe in the 1990s. Regional transmission organizations (RTOs) and independent system operators (ISOs) now manage competitive wholesale markets in much of the U.S., operating real-time and day-ahead energy markets, capacity markets, and ancillary services markets under the oversight of the Federal Energy Regulatory Commission (FERC). The FERC electric power markets overview describes the regulatory framework within which these markets operate and the standards that govern market participant behavior.

Market Structure and Wholesale Trading

Wholesale electricity markets are auctions in which generators submit cost-based or market-based bids to supply power, and the system operator selects resources in merit order to minimize dispatch cost while satisfying transmission constraints. Day-ahead markets clear prices for the following operating day using load forecasts and generator offers, while real-time markets balance supply and demand in intervals of five to fifteen minutes using actual conditions. Capacity markets, used in several U.S. RTOs including PJM and ISO-NE, compensate generators for being available to produce power during peak periods, providing revenue that supports the continued operation of plants whose energy market revenues alone may be insufficient. The Resources for the Future explainer on U.S. electricity markets provides a detailed treatment of how these market layers interact to deliver reliable and economically efficient outcomes.

Emissions Trading

Emissions trading programs are a key policy instrument layered on top of electricity markets to reduce the environmental externalities of power generation. In a cap-and-trade system, a regulator sets a ceiling on total allowable emissions of a pollutant, typically carbon dioxide or sulfur dioxide, and distributes or auctions a corresponding number of allowances to covered entities. Generators that can reduce emissions cheaply do so and sell surplus allowances; those facing higher abatement costs purchase allowances rather than cutting output. The interaction between carbon prices and electricity prices affects the relative competitiveness of generation technologies: a sufficiently high carbon price raises the dispatch cost of coal-fired plants relative to natural gas and zero-emission renewables, shifting the merit order and reducing emissions. The Regional Greenhouse Gas Initiative (RGGI) in the northeastern U.S. and the European Union Emissions Trading System (EU ETS) are the largest power-sector cap-and-trade programs in operation.

Transactive Energy

Transactive energy is a market design concept that extends price signals to distributed energy resources such as rooftop solar, battery storage, electric vehicles, and smart appliances at the distribution network level. Rather than relying on central dispatch, transactive energy systems use automated agents that respond to real-time price or control signals to shift consumption or inject power into the grid. This approach enables demand flexibility from millions of small resources to contribute to system balance, complementing the large-scale resource scheduling that wholesale markets handle. Deloitte's 2026 Power and Utilities Industry Outlook identifies transactive energy and grid edge intelligence as significant areas of investment as utilities adapt their business models to higher penetrations of distributed resources.

Applications

Power markets have applications in a wide range of fields, including:

• Renewable energy procurement, through long-term contracts and spot market purchases
• Carbon policy implementation, using price signals to shift generation away from high-emission sources
• Grid reliability management, through capacity and ancillary services markets
• Demand-response programs, enabling industrial and commercial customers to reduce load during high-price periods
• Transmission investment planning, guided by congestion cost signals from locational marginal pricing