Beatrice Lang
The physical quantity that electric companies sell is electricity, which is the set of physical phenomena associated with the presence and motion of matter possessing an electric charge. Electric companies are responsible for the production and delivery of electrical energy, which is typically available on-demand to businesses and homes. The price of electricity is a crucial and complex factor in the forecasting process, influenced by various physical and economic constraints. The amount of electricity delivered is measured in watts, with thousands, millions, and billions of watts referred to as kilowatts, megawatts, and gigawatts, respectively. Electric companies monitor power usage and adjust their infrastructure to minimize power loss and maintain a balance between supply and demand.
| Characteristics | Values |
|---|---|
| Physical Quantity Sold | Electric Power |
| Definition | The rate of transfer of electrical energy within a circuit |
| SI Unit | Watt |
| General Unit | Power |
| Definition of Watt | One joule per second |
| Other Units | Kilowatts, Megawatts, Gigawatts |
| Production | Electric generators, electric batteries |
| Supply | Electric power industry through an electrical grid |
| Delivery | Transmission lines |
| Applications | Motion, light, heat |
| Volatility | High at times of peak demand and supply shortages |
| Price Risk | Price spikes, price steps |
| Volume Risk | Uncertain volumes or quantities of consumption or production |
| Price Modelling | Fixed (or customer) charges, variable (energy) charges |
| Price Determination | Marginal price, multipart tariffs |
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What You'll Learn
- Electric power is measured in watts
- The smallest quantity of electricity is a single electron
- The price of electricity is determined by supply and demand
- Electricity is available on-demand, so supply and demand must be closely matched
- Electricity retailers buy from the wholesale market and sell to the consumer
Electric power is measured in watts
Electric power is indeed measured in watts. The watt is the unit of power in the International System of Units (SI), named after James Watt, the 18th-century inventor of the steam engine. One watt is equal to one joule per second, or one kilogram-metre squared second to the power of negative three. It is used to measure the rate of energy transfer.
In the context of electromagnetism, one watt is the rate at which electrical work is performed when a current of one ampere flows across an electrical potential difference of one volt. In other words, it is the power supplied by a current of one ampere at a voltage of one volt.
The power consumption of small devices is usually measured in watts, while that of larger devices is measured in kilowatts (one thousand watts). Electricity generation capacity is often measured in multiples of kilowatts, such as megawatts (one thousand kilowatts) and gigawatts (one thousand megawatts).
Electricity is typically available on demand, meaning that supply must closely match demand at all times. This is known as grid balancing. The price of electricity can be volatile, and is influenced by various factors, including the mix of generation types and the relationship between demand and weather patterns.
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The smallest quantity of electricity is a single electron
The physical quantity that electric companies sell is electrical energy, which is typically available on demand. The supply of electricity must closely match its demand, and any mismatch can cause generators to absorb extra energy or produce more power to maintain the target utility frequency of either 50 or 60 hertz.
Electricity is a set of physical phenomena associated with the presence and motion of matter possessing an electric charge. Electric charge gives rise to and interacts with the electromagnetic force, one of the four fundamental forces of nature. The presence of either a positive or negative electric charge produces an electric field, and the motion of electric charges creates an electric current and a magnetic field.
Electric charge can be transferred between bodies through direct contact or by passing along a conducting material, such as a wire. The charge can be measured using various instruments, such as the gold-leaf electroscope or electronic devices. The smallest quantity of electricity is a single electron, and the unit of electrical energy commonly used for utility bills is the kilowatt-hour (kWh).
In physics and chemistry, the electronvolt (eV) is a commonly used unit of energy on the atomic scale. One eV is equivalent to the kinetic energy acquired by an electron passing through a potential difference of 1 volt in a vacuum. This unit is also used in spectroscopy to represent energy, as energy is inversely proportional to wavelength.
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The price of electricity is determined by supply and demand
The physical quantity that electric companies sell is electricity, which is the set of physical phenomena associated with the presence and motion of matter possessing an electric charge. The price of electricity is determined by a complex intersection of engineering and economics, where demand and supply are key factors.
Electricity is typically available on demand, and the supply must match demand very closely, despite continuous variations in both. The demand for electricity varies due to human activity and needs. For example, electricity demand is usually highest in the afternoon and early evening (peak hours), so costs to provide electricity are usually higher at these times. Similarly, prices are usually highest in the summer when total demand is high because more expensive generation sources are added to meet the increased demand. Extreme temperatures can also increase demand for heating and cooling, which can, in turn, increase fuel and electricity prices.
The wholesale electricity price is the amount suppliers pay to buy the electricity they use to supply end consumers. It is the most significant single component of a typical consumer bill. The wholesale price of electricity on the electric power grid reflects the real-time cost of supplying electricity. The wholesale price can be established at a node on the transmission grid, and electricity quantities at that node are reconciled, enabling competition for retail customers within the distribution system beyond the node.
There are three main models for calculating the wholesale electricity price: zonal or regional pricing, nodal or locational marginal pricing (LMP), and the merit-order or supply stack model. Zonal or regional pricing involves dividing the transmission system into several predetermined zones or geographical regions, each with uniform electricity prices. Nodal or LMP markets, on the other hand, divide the national network into hundreds or thousands of nodes with unique wholesale electricity prices, where each node's price represents the cost to serve one additional unit of energy. The merit-order model, commonly used in predominantly thermal power-based electrical systems, determines prices based on the intersection of demand and supply.
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Electricity is available on-demand, so supply and demand must be closely matched
Electricity is typically available on demand. To achieve this, electricity suppliers must closely match supply with demand at any given time. This is known as "grid balancing". The continuous variations in both supply and demand pose challenges for electricity suppliers, who need to avoid undersupply and oversupply.
Undersupply occurs when suppliers do not generate enough electricity, which can lead to problems such as blackouts and brownouts. On the other hand, oversupply happens when suppliers generate too much electricity. In some cases, they may be able to sell this excess energy, but if there is no demand, it goes to waste as electricity cannot be stored and can only be converted to other forms of energy.
Demand for electricity varies over the course of a day, a week, or a year. For example, people tend to use more electricity in the morning and evening, and less during the day when they are at school or work. Seasonal changes also impact demand, with higher usage of air conditioners in the summer and heaters in the winter. To manage these fluctuations in demand, suppliers use historical records and advanced computer models to predict how much electrical energy they need to generate at any given time.
Matching supply with demand is particularly challenging in electricity systems dominated by renewable energy sources. Unlike conventional generation technologies, where electricity is generated on demand, renewable sources such as wind and solar power are intermittent and cannot always be relied upon. This leads to a significant demand-supply gap, and actions on the supply side alone may not be sufficient to address this challenge. Effective demand-side solutions are also needed to manage variations in both supply and demand and ensure a stable supply of electricity.
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Electricity retailers buy from the wholesale market and sell to the consumer
Electricity is typically available on demand, meaning that supply must closely match demand at any given time. This is known as "grid balancing". The only safety margins are often provided by the kinetic energy of physically rotating machinery (synchronous generators and turbines). If there is a mismatch between supply and demand, the generators can either absorb extra energy by speeding up or produce more power by slowing down, thereby increasing or decreasing the utility frequency.
Electricity retailers are those who buy from the wholesale market, while generators sell to the wholesale market. The wholesale electricity market is constantly evolving, with new players and energy supply products entering the market. Retailers can purchase power at wholesale prices and pass on those savings to consumers. However, they are exposed to price and volume risks and effects, such as the inability to accurately predict consumer demand. To protect themselves from volatility, retailers and generators enter into "hedge contracts" with each other. These contracts vary by regional market due to different conventions and market structures, but the two simplest and most common forms are simple fixed-price forward contracts for physical delivery and contracts for differences. In the latter, if the resulting wholesale price index is higher than the "strike" price, the generator will refund the difference between the two prices for that period.
Grid operators play a crucial role in ensuring that power supply and consumer demand are balanced. They are responsible for dispatching power from generators to meet demand. While their primary focus is on ensuring there is enough power, they also help determine the wholesale cost of electricity. In some cases, they can dispatch power from low-cost generation plants, but they may also need to turn to high-cost power plants to meet demand quickly.
Electric utilities are public companies that deliver power to end-use consumers. In regulated states, they often own generation plants and transmission lines, while in deregulated states, they are primarily involved in local power delivery and customer billing. In these deregulated energy states, retail energy providers purchase electricity from the wholesale market and then resell it to their consumers.
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Frequently asked questions
The electric company sells electric power, which is the rate of transfer of electrical energy within a circuit. The SI unit of electric power is the watt, which is defined as one joule per second.
The price of electricity is a complex component in the forecasting process and can vary due to several factors. These factors include fixed and variable charges, demand charges for larger customers, and seasonal variations. The price is also affected by the relationship between supply and demand, with higher prices during peak demand periods or supply shortages.
The amount of electricity generated is measured in units called coulombs. A coulomb is defined as the quantity of electricity that flows past a point in an electric circuit when a current of one ampere is maintained for one second.
Electric companies monitor the phase shift generated by individual homes and neighbourhoods to determine what appliances are using electricity. This information helps them identify if any changes are needed to optimise their operations and reduce power loss.
