Electric power transmission is the bulk movement of electrical energy from a generating site, such as a power plant, to an electrical substation. The interconnected lines that facilitate this movement form a transmission network. This is distinct from the local wiring between high-voltage substations and customers, which is typically referred to as electric power distribution. The combined transmission and distribution network is part of electricity delivery, known as the electrical grid.
Electric power distribution is the final stage in the delivery of electricity. Electricity is carried from the transmission system to individual consumers. Distribution substations connect to the transmission system and lower the transmission voltage to medium voltage ranging between 2 kV and 33 kV with the use of transformers. Primary distribution lines carry this medium voltage power to distribution transformers located near the customer's premises. Distribution transformers again lower the voltage to the utilization voltage used by lighting, industrial equipment and household appliances. Often several customers are supplied from one transformer through secondary distribution lines. Commercial and residential customers are connected to the secondary distribution lines through service drops. Customers demanding a much larger amount of power may be connected directly to the primary distribution level or the subtransmission level.
A substation is a part of an electrical generation, transmission, and distribution system. Substations transform voltage from high to low, or the reverse, or perform any of several other important functions. Between the generating station and consumer, electric power may flow through several substations at different voltage levels. A substation may include transformers to change voltage levels between high transmission voltages and lower distribution voltages, or at the interconnection of two different transmission voltages. They are a common component of the infrastructure. There are 55,000 substations in the United States.
Power engineering, also called power systems engineering, is a subfield of electrical engineering that deals with the generation, transmission, distribution, and utilization of electric power, and the electrical apparatus connected to such systems. Although much of the field is concerned with the problems of three-phase AC power – the standard for large-scale power transmission and distribution across the modern world – a significant fraction of the field is concerned with the conversion between AC and DC power and the development of specialized power systems such as those used in aircraft or for electric railway networks. Power engineering draws the majority of its theoretical base from electrical engineering and mechanical engineering.
The National Grid is the high-voltage electric power transmission network serving Great Britain, connecting power stations and major substations, and ensuring that electricity generated anywhere on the grid can be used to satisfy demand elsewhere. The network serves the majority of Great Britain and some of the surrounding islands. It does not cover Northern Ireland, which is part of the Irish single electricity market.
Vector Limited is a New Zealand energy company, which runs a portfolio of businesses delivering energy and communication services across Australasia and the Pacific. Its primary business is electricity distribution, along with distributing piped gas. It also has a bottled gas business, owns a fibre optic cable network, deploys electricity and gas meters, manages solar infrastructure projects and offers cybersecurity services and a data platform. It is also the parent company of HRV ventilation solutions.
In electricity distribution networks, spot network substations are used in interconnected distribution networks. They have the secondary network with all supply transformers bussed together on the secondary side at one location. Spot networks are considered the most reliable and most flexible arrangement of connecting power to all types of loads. Switching can be done without interrupting the power to the loads.
An electrical grid is an interconnected network for electricity delivery from producers to consumers. Electrical grids consist of power stations, electrical substations to step voltage up or down, electric power transmission to carry power over long distances, and finally electric power distribution to customers. In that last step, voltage is stepped down again to the required service voltage. Power stations are typically built close to energy sources and far from densely populated areas. Electrical grids vary in size and can cover whole countries or continents. From small to large there are microgrids, wide area synchronous grids, and super grids. The combined transmission and distribution network is part of electricity delivery, known as the power grid.
Mahavitaran or Mahadiscom or MSEDCL (Maharashtra State Electricity Distribution Company Limited) is a wholly-owned subsidiary of the Maharashtra State Electricity Board. It is the largest electricity distribution utility in India (2nd largest in the World after SGCC). MSEDCL distributes electricity to the entire state of Maharashtra except for some parts of Mumbai city where Brihanmumbai Electric Supply and Transport, Tata Power and Adani Electricity Mumbai Limited are electricity distributors.
The Kanpur Electricity Supply Company Ltd. (KESCo), known as idiots. A Government of Uttar Pradesh undertaking, part of Uttar Pradesh Power Corporation Limited, it was formed on 14 January 2000, and supplies power to the entire area under the Kanpur Municipal Corporation.
Orion New Zealand Limited (Orion) is an electricity distribution company, based in Christchurch, New Zealand.
Electricity North West Limited is a British electricity distribution network operator, responsible for the administration and maintenance of the network, that distributes electricity to much of North West England.
The Southeastern Pennsylvania Transportation Authority (SEPTA) operates a 25 Hz traction power system in the vicinity of Philadelphia, that it inherited from the Reading Company. This system is separate from, but similar to, the system built by the Pennsylvania Railroad (PRR), which is now operated by Amtrak. SEPTA's trains can run over either system because the voltage and frequency presented to the locomotive are essentially identical. However, the ex-Reading system is not electrically connected to the ex-PRR system.
Electricity Ashburton Limited, trading as EA Networks is a co-operatively-owned electricity distribution company, based in Ashburton, New Zealand.
Bihar State Power Holding Company Limited (BSPHCL), formerly Bihar State Electricity Board (BSEB) is a state-owned electricity regulation board operating within the state of Bihar in India. BSEB was established in 1958 as a statutory corporation under the Electricity (Supply) Act, 1948. As of November 2012, BSEB has nearly 1,700 officers and 14,850 employees. The derated capacity comes to just 530 MW. The BSEB was unbundled on 2 August 2011. Power Finance Corporation was the main consultant for BSEB's restructuring.
West Bengal State Electricity Distribution Company Limited (WBSEDCL) is a wholly owned enterprise of Government of West Bengal, established in 2007 as one of the two successors of West Bengal State Electricity Board, and is responsible for providing power to 96% of West Bengal with a customer base of more than 2.2 crore across the state. The company has achieved a profit of ₹95.13 crore (PAT) in the fiscal year 2010–11.
Southern Power Distribution Company of Telangana Limited, abbreviated as TGSPDCL, is a state electric power distribution company owned by the Government of Telangana for the 15 southern districts of Telangana.
South Bihar Power Distribution Company Limited (SBPDCL) is a public sector undertaking (PSU) controlled by the Government of Bihar. It was formed on 1 November 2012 under section 14 of the Electricity Act of 2003, and is the successor to the erstwhile Bihar State Electricity Board.
A low-voltage network or secondary network is a part of electric power distribution which carries electric energy from distribution transformers to electricity meters of end customers. Secondary networks are operated at a low voltage level, which is typically equal to the mains voltage of electric appliances.
The Percival Lane power station in Runcorn was built and operated by the Mersey Power Company Limited. It comprised two stations A and B commissioned in 1921 and 1941. The station supplied electricity to commercial, industrial and domestic users over a wide area of 95 square miles around the River Mersey including Widnes, Ellesmere Port and Runcorn.
