Beatrice Lang
The electricity market is a complex structure that varies across different regions. In the US, the market is characterized by a mix of companies with varying ownership models, including private, municipal, cooperative, and different levels of government ownership. The market structure can be traditionally regulated or restructured, with wholesale and retail components. Wholesale markets involve sales between utilities and traders, while retail markets involve sales directly to consumers. Some states have restructured their markets to increase competition, allowing consumers to choose their electricity providers and generation options, including renewable energy. The integration of distributed energy resources (DERs) has led to innovative market structures, such as local flexibility markets, while the rise of renewable energy sources may require adaptations in the wholesale market structure. Balancing authorities, including RTOs and ISOs, play a crucial role in maintaining grid reliability and fostering competition. The market externality of greenhouse gas emissions is sometimes addressed through carbon pricing.
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What You'll Learn
Wholesale electricity markets
The traditional wholesale electricity market structure is characterized by utilities that are frequently vertically integrated. This means that a single entity owns the infrastructure for electricity generation, transmission, and distribution. An example of this is the Tennessee Valley Authority, which is the largest generation company and is federally owned. These markets are regulated by FERC, which ensures oversight and promotes competition.
However, with the evolution of the electricity industry, many states have moved towards restructuring or deregulation of their wholesale markets. This has led to the emergence of restructured wholesale electricity markets. In these markets, independent system operators (ISOs) and regional transmission organizations (RTOs) play a crucial role. ISOs operate transmission systems independently and foster competition among wholesale market participants. RTOs, on the other hand, are independent, membership-based, non-profit organizations that ensure reliability and optimize supply and demand bids for wholesale electric power. Examples of RTOs include the California Independent System Operator (CAISO) and the Electric Reliability Council of Texas (ERCOT).
Restructured wholesale electricity markets introduce competition and customer choice. Electricity customers in deregulated areas have the option to select their electric supplier, creating a competitive environment for retail electricity prices. This restructuring also shifts the investment risk in power plants from customers to electric suppliers. Additionally, restructured markets may face challenges in accommodating renewable energy sources, as the increasing presence of renewable generators can significantly impact wholesale prices and long-term investment decisions.
Overall, wholesale electricity markets, whether traditional or restructured, play a critical role in ensuring the reliable and efficient provision of electricity to consumers. The specific market structure depends on the region and the regulatory environment, with some states opting for deregulation and others retaining traditional regulated markets.
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Retail electricity markets
The structure of electricity markets can vary depending on the region and the specific market in question. In general, electricity markets can be categorized as wholesale markets or retail markets. Wholesale markets involve the sale of electricity among generators and resellers, who then sell electricity to consumers. On the other hand, retail markets involve the direct sale of electricity to consumers.
The availability of retail choice can depend on whether the market is traditionally regulated or restructured (deregulated). In traditionally regulated wholesale markets, utilities are usually vertically integrated monopolies that are solely responsible for electricity generation, transmission, and distribution to their customers. They determine the mix of resources for electricity generation with approval from state public utility commissions. In contrast, restructured wholesale markets allow utilities serving retail customers only to deliver electricity, with generation handled by other entities. These generating entities sell electricity through competitive power markets, and the competition helps determine wholesale electricity prices.
The structure of retail electricity markets can also vary across different states and regions. For example, some states like California have partially restructured markets, offering retail choice to certain consumers. Additionally, the incorporation of distributed energy resources (DERs) has led to innovative local flexibility markets, where entities act as aggregators to guarantee the operational safety of the distribution network. The electricity market structure may also include ancillary services essential for the system's overall operation, such as frequency control markets and voltage control, which do not directly generate income in an "energy-only" model.
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Distributed energy resources (DERs)
The electricity market structure varies across different regions. In the US, for instance, there is a complex mix of companies, with varying ownership structures, ranging from privately owned utilities in Hawaii to publicly owned ones in Nebraska and federally owned companies like the Tennessee Valley Authority. The market structure is influenced by factors such as regulation, the presence of wholesale markets, and customer choice.
Physical DERs generally have a capacity of less than 10 MW and can include diesel or natural gas generators, microturbines, solar arrays, small wind farms, and battery energy storage systems. These physical assets can be owned and operated by electric utilities, independent power producers, or local businesses, with the utility directing their operation in a manner similar to large central power plants.
Virtual DERs, on the other hand, are more abstract and are formed by aggregating multiple physical assets so that they appear as a single resource to the utility. Examples of virtual DERs include behind-the-meter diesel generators, solar panels, and batteries combined to form a virtual power plant (VPP).
The incorporation of DERs has led to the emergence of innovative electricity markets, such as local flexibility markets, with aggregating entities representing multiple DERs. These flexibility markets aim to ensure the operational safety of the distribution network. While the concept is relatively new and still being researched, DERs offer various benefits, including revenue generation, cost savings, and enhanced resilience during grid outages.
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Transmission rights
The electricity market structure varies depending on the region. In the US, for instance, there is a mix of companies that are privately owned, owned by varying levels of government, or owned by municipalities and cooperatives. In some cases, the electricity market is traditionally regulated, while in others it is restructured.
Physical rights refer to the right to use transmission capacity. In other words, it is the right to flow power over a transmission element or a set of transmission elements. These rights are essential to ensure that electricity can be transferred from generators to loads. The transmission system includes high-voltage transmission lines, transformers, phase shifters, and other devices that enable the transfer of electricity.
Financial rights, on the other hand, are associated with revenues related to transmission congestion. They are financial instruments that do not directly impact physical flows but are used to manage congestion costs. Financial transmission rights (FTRs) are a type of financial instrument that provides compensation for congestion costs that occur when the transmission grid is congested. FTRs are defined in megawatts and are unidirectional. They are calculated based on the difference in Day-Ahead Locational Marginal Prices (LMPs) that result from dispatching generators to relieve congestion. FTRs can be acquired through auctions, and the auction revenue is distributed to market participants.
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Electricity futures
The electricity market structure varies across different regions. In the US, for example, there is a mix of companies that are either privately owned or owned by different levels of government, while in Norway, electricity supply is mostly managed at the municipal level. The market structure can also differ depending on whether the market is traditionally regulated or restructured, whether it is an organised wholesale market or utility that manages the transmission of electricity, and whether retail choice is available.
The electricity futures market is more complex than other futures markets due to an additional variable: there is no future settlement date defined, but rather various settlement periods. The market also offers the option of concluding electricity supply contracts for longer periods, up to six years in advance, which provides participants with long-term planning and security. However, for contracts covering periods far in the future, market liquidity is often low, making trading more challenging.
The electricity market differs from traditional financial markets because electricity is produced and consumed instantly and cannot be readily stored. Therefore, supply and demand must be constantly balanced in real time, leading to a significantly different market design. The electricity market is also more fragmented than traditional capital markets and is managed by independent operators such as Independent System Operators (ISOs) in the US. These operators act as market operators and perform tasks such as power plant dispatch and real-time power balance operations, facilitating competition and guarding against market manipulation.
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Frequently asked questions
The US electricity market is a complex mix of companies, owned either privately or by varying levels of government. The market has both wholesale and retail components. Wholesale markets involve the sale of electricity among electric utilities and electricity traders before it is sold to consumers. Retail markets involve the sale of electricity directly to consumers.
Electricity markets can be traditionally regulated or restructured. Traditionally regulated markets are vertically integrated monopolies where the utility may own or oversee the generation, transmission, and delivery of electricity to customers. Restructured markets allow for retail choice, where consumers can choose their electricity provider and generation options, including renewable energy.
To engage in a physical (direct) PPA, a consumer must be in a competitive retail market, and the project must be in a competitive wholesale market that is interconnected with the consumer's ISO. To engage in a financial PPA, a consumer can be anywhere in the country, but the project must be in a competitive wholesale market.
ISOs (Independent System Operators) and RTOs (Regional Transmission Organizations) were formed to foster competition, guard against market manipulation, facilitate grid planning, and ensure all power suppliers have access to the electricity grid. They manage the transmission system and centrally dispatched markets in their regions.
The electricity market faces challenges such as the incorporation of renewable energy sources, which can offer $0 bids and significantly reduce wholesale prices, potentially discouraging long-term investment. Additionally, the market externality of greenhouse gas emissions needs to be addressed, sometimes through carbon pricing.
