Trystan Casey
The pricing of electricity supply is a complex process, influenced by various factors. The cost of electricity supply is determined by the wholesale electricity price, which is the amount suppliers pay to buy electricity. This price is influenced by factors such as fuel prices, power generation availability, demand, government policies, and market competition. Demand for electricity is usually highest during peak hours, resulting in higher costs to provide electricity during these periods. Additionally, local energy production, renewable energy sources, and market deregulation can impact electricity pricing. External factors such as international conflicts and supply chain disruptions can also contribute to fluctuations in electricity prices.
| Characteristics | Values |
|---|---|
| Demand | Demand for electricity contributes to the cost of supplying electricity. Electricity demand is usually highest in the afternoon and early evening (peak hours), so costs to provide electricity are usually higher at these times. |
| Supply | The amount of available supply can also affect electricity rates. If a surplus exists, prices may decrease; and when supplies run short, energy prices often increase. |
| Time of day | Retail electricity prices are usually highest for residential and commercial consumers because it costs more to distribute electricity to them. Time-of-day pricing can encourage electricity conservation and reduce peak demand. |
| Location | Electricity prices vary widely by country or by locality within a country. States like Hawaii, Massachusetts, California, and Alaska tend to have some of the most expensive electricity in the U.S. |
| Market structure | In a deregulated market, consumers can choose their energy provider, promoting competition and price flexibility. In regulated markets, consumers cannot pick their company. |
| Fuel prices | Fuel prices, especially for natural gas and petroleum fuels, may increase during periods of high electricity demand and when supply constraints occur due to extreme weather events or accidental damage. |
| World events | International events such as health crises, wars, and border conflicts can disrupt energy production and distribution, leading to increases in energy rates. |
| Power generation availability | Demand may require additional generation plants to produce enough power to support consumption. |
| Taxes and fees | Retail electricity prices include taxes and other fees, such as government taxes, CO2 taxes, and subsidies. |
| Wholesale price | The wholesale electricity price is the amount suppliers pay to buy electricity, which they then supply to consumers. It is a significant component of a typical consumer bill. |
| Levelized cost of electricity (LCOE) | The LCOE is the net present value of the unit cost of electricity over the lifetime of a generating asset. However, it does not account for system costs related to grid stability and power quality. |
| Generating source mix | The mix of generating sources in a utility's portfolio can substantially affect electricity pricing. Utilities with a high percentage of hydroelectricity tend to have lower prices, while those with older coal-fired power plants tend to have higher prices. |
| Inflation | Between 2013 and 2023, electricity prices closely tracked inflation, but increases in electricity prices are expected to outpace inflation through 2026. |
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What You'll Learn
Supply and demand
The pricing of electricity supply is a complex interplay of engineering and economics. The wholesale electricity price, or the amount suppliers pay to buy electricity, is a significant component of the consumer bill. This price varies minute by minute and is influenced by several factors, including supply and demand.
Demand for electricity is usually highest during the afternoon and early evening, known as peak hours, resulting in higher costs to provide electricity during these times. Similarly, electricity prices tend to be highest in the summer when total demand is high, and more expensive generation sources are utilised to meet the increased demand.
The integration of renewable energy sources, such as solar power, can shift the lowest cost of electricity to midday when solar energy generation peaks. Time-of-use tariffs can encourage consumers to shift their electricity consumption away from peak periods, reducing overall demand during those times.
The supply of electricity needs to balance the demand 24/7. However, supply may not always grow at the same rate as demand, leading to potential shortages and increased prices. The generating source mix of a utility company also influences the price of electricity supplied. For example, utilities with a high percentage of hydroelectricity tend to have lower prices, while those relying on older coal-fired power plants often have higher electricity prices.
In a deregulated market, consumers can choose their energy provider, promoting competition and price flexibility. Price competition can benefit consumers in such markets, but they may also experience price volatility during peak demand periods. Conversely, in regulated markets, consumers are limited to a single utility company, which controls the pricing without direct competition.
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Wholesale pricing
The wholesale electricity market in the United States is made up of many regional markets, with prices varying across regions. Wholesale electricity prices are closely tied to wholesale natural gas prices, except in the central region of the country. Wholesale markets are subject to regulation by the Federal Energy Regulatory Commission (FERC).
Wholesale electricity is generated by power plants and sold into the energy market. "Load servers" or "suppliers" then purchase this electricity wholesale and supply it to retail consumers. The wholesale electricity market is made up of three types of markets that determine wholesale prices: energy markets, capacity markets, and ancillary services markets. Energy markets are auctions used to coordinate electricity production on a day-to-day basis. In these markets, electricity suppliers offer to sell electricity at a particular bid price, and load-serving entities (the demand side) bid for the electricity to meet their customers' energy demands.
High prices in the energy market, usually caused by low supply and high demand, incentivize more generators to enter the market. This increase in supply subsequently lowers energy prices and indicates that there is enough generating capacity to meet demand. The wholesale price is calculated using the formula: I = Σ (P • V) / T, where I = Volumetric Weighted Average Index Price, P = price or premium of individual transaction, V = volume of individual transaction, Σ (P • V) = sum of each transaction's price multiplied by its volume, and T = total volume of all qualifying transactions.
In restructured electricity markets, such as Connecticut, Maine, Massachusetts, New Hampshire, and Rhode Island, customers can purchase power directly from a supplier of their choice. In these markets, the wholesale electricity price is produced every hour of every day at defined locations across the power system. The relationship between wholesale market costs and retail rates varies according to state retail procurement policies. For example, short-term wholesale market prices differ from the fixed prices of supplier services provided to residential consumers over a longer period.
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Power plant costs
The cost of electricity supply is influenced by several factors, including the demand for electricity, fuel prices, labour requirements, location, access to infrastructure, and the level of subsidies received. These factors contribute to the complex process of balancing the electricity grid and determining the price that consumers pay.
The location of a power plant impacts costs due to factors such as raw materials, access to infrastructure like grid interconnection and fuel supply, and transportation considerations. For example, states like Hawaii, California, and Alaska tend to have higher electricity prices due to fuel prices and supply constraints. In contrast, states like North Dakota, Nebraska, Utah, and Wyoming benefit from local energy production and access to renewable sources, contributing to more stable and affordable electricity prices.
The level of subsidies received by power plants also influences their costs. For instance, unsubsidized energy sources like rooftop residential solar fittings tend to have higher levelized costs due to their small-scale deployment and weather dependency. On the other hand, subsidized energy sources may benefit from reduced costs and increased price competitiveness.
Additionally, the electricity market structure, whether regulated or deregulated, affects power plant costs. In a deregulated market, consumers can choose their energy provider, promoting competition and price flexibility. However, consumers may also be exposed to price volatility during peak demand or due to external factors like international conflicts disrupting supply chains.
In summary, power plant costs are multifaceted and subject to various technological, economic, and geographic factors. These costs ultimately contribute to the overall pricing of electricity supply and can vary across different regions and market conditions.
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Fuel prices
The laws of supply and demand influence the price of natural gas and other fuels. When demand increases, the price of natural gas tends to rise, leading to higher electricity prices. Similarly, when demand decreases, prices may fall. The amount of available supply also plays a role; a surplus can lead to lower prices, while short supplies can drive up energy prices.
Extreme weather events can also impact fuel prices and electricity generation. For example, droughts or low wind speeds can reduce low-cost electricity generation from hydropower or wind sources, increasing the demand and price of other energy sources.
Fuel supply constraints or disruptions due to weather events or accidental damage to infrastructure can further increase fuel prices and electricity generation costs. The cost of generating electricity, including fuel prices, power plant costs, and transmission and distribution system costs, is the largest component of the price of electricity.
The wholesale electricity price, which is the amount suppliers pay to buy electricity, is a significant factor in consumer bills. The retail price of electricity varies based on the type of consumer, with residential and commercial consumers typically paying higher prices due to the higher distribution costs.
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Transmission and distribution systems
In the United States, the Energy Information Administration (EIA) publishes projections for the average annual prices of electricity generation, transmission, and distribution. Regulated electrical utilities are required to disclose their capital expenditure (capex) and operational expenditure (opex) costs, which are used to determine utility charges. Transmission and distribution costs have doubled in the past 20 years, averaging 7c/kWh in 2024, up from 3.5c/kWh in 2004-2005. The largest contributor to rising costs is the rising transmission and distribution capex required to accommodate renewable energy sources, which has trebled from 1c/kWh to 3c/kWh.
In PJM zones, transmission owners recover their costs through the Network Integration Transmission Service (NITS) rate, which is based on a customer's Network Service Peak Load (NSPL) value. NITS rates have been increasing due to investments in system upgrades and enhancements, such as addressing aging infrastructure and integrating new renewable generation sources.
Retail electricity prices may include transmission costs in addition to the energy supply cost. These transmission costs can vary based on the electric distribution company, supplier, and electricity product.
The pricing dynamics of transmission and distribution systems are influenced by market structures. In a deregulated market, consumers can choose their energy provider, promoting competition and price flexibility. In contrast, consumers in regulated areas may be exposed to price volatility during peak demand but benefit from price protection against external forces affecting the market, such as international conflicts disrupting supply chains.
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Frequently asked questions
Several factors influence the price of electricity, including:
- Demand: The cost of supplying electricity is influenced by the demand for it. Electricity demand is usually highest in the afternoon and early evening, so costs are typically higher during these peak hours.
- Fuel prices: Fuel prices, especially for natural gas, can increase during periods of high electricity demand or when there are fuel supply disruptions due to extreme weather events or accidental damage to infrastructure.
- Generation source mix: The type of energy sources used to generate electricity can impact prices. For example, utilities with a high percentage of hydroelectricity tend to have lower prices, while those relying on older coal-fired power plants often have higher prices.
Electricity prices can vary significantly by country or even within different localities of the same country. For example, within the United States, states like Hawaii, Massachusetts, California, and Alaska tend to have higher electricity prices, while states like North Dakota, Nebraska, Utah, and Wyoming benefit from more affordable electricity due to local energy production and access to coal and renewable energy sources.
The market structure, referring to whether it is regulated or deregulated, impacts pricing. In a regulated market, consumers are limited to a single utility company and may experience less price volatility. In a deregulated market, consumers can choose their energy provider, promoting competition and price flexibility. In such a market, prices may be more volatile during peak demand periods.
