901 articles
Orlando Utilities Commission
The Orlando Utilities Commission (OUC) is a municipally owned electric and water utility serving Orlando and St. Cloud, Florida, created by the state legislature in 1923.
Out-of-step protection
Out-of-step protection is the power system protection that detects loss of synchronism on a grid, blocking distance relays during stable swings and tripping breakers during unstable swings.
OVEC (Ohio Valley Electric Corporation)
The Ohio Valley Electric Corporation, OVEC, is a utility holding company organized in 1952 to supply power to Atomic Energy Commission uranium enrichment plants near Portsmouth, Ohio.
Overcurrent protection
Overcurrent protection is a power system protection method in which a relay trips a circuit breaker when current exceeds a preset pickup value, after a fixed or inverse-time delay.
Overhead ground wire
An overhead ground wire, also called a shield wire, static wire, earth wire, or skywire, is a grounded conductor atop power lines that intercepts lightning strokes.
Overhead power line
An overhead power line, also known as a high tension line, carries electric power through conductors suspended above the ground on poles or towers, using air as insulation.
Pacific DC Intertie
The Pacific DC Intertie, also known as the Pacific Direct Current Intertie, is a high-voltage direct current power line linking Oregon to Los Angeles, completed in 1970.
Patratu Vidyut Utpadan Nigam
Patratu Vidyut Utpadan Nigam Limited, commonly abbreviated PVUNL, is an Indian power generation company incorporated in 2015, owned 74 percent by NTPC and 26 percent by Jharkhand Bijli Vitran Nigam.
Peak shaving
Peak shaving is a load management technique in power engineering that cuts a customer's maximum electricity demand, typically by discharging a battery, to lower demand charges and relieve grid stress.
PECO (utility)
PECO Energy Company, commonly called PECO, is an Exelon-owned utility founded in 1902 that delivers electricity and natural gas to about 1.6 million customers in Philadelphia and southeastern Pennsylvania.
Pepco Holdings
Pepco Holdings was an American utility holding company in Washington, D.C., parent of Pepco, Delmarva Power, and Atlantic City Electric, acquired by Exelon in 2016.
Per Gunnar Engström
Per Gunnar Engström (1923–2015) was a Swedish electrical engineer at ASEA who led HVDC transmission development and was elected to the US National Academy of Engineering in 1992.
PetroVietnam Power Corporation
PetroVietnam Power Corporation (PV Power) is a Vietnamese power generation company, part of Petrovietnam, operating plants including Nhon Trach, Ca Mau, Vung Ang 1, and Hua Na.
PGE Górnictwo i Energetyka Konwencjonalna
PGE Górnictwo i Energetyka Konwencjonalna (PGE GiEK) is a Polish power company owned by PGE Polska Grupa Energetyczna, based in Bełchatów, that generates about 31% of Poland's electricity.
Phase-shifting transformer
A phase-shifting transformer (PST) is a specialized transformer that controls active power flow in three-phase transmission networks by regulating the voltage angle, letting operators direct power along chosen paths instead of physics-decided ones.
Phasor data concentrator
A phasor data concentrator (PDC) is a device or software function in a power system that time-aligns synchrophasor data from multiple PMUs for control centers, defined by IEEE C37.247-2019.
Phasor estimation
Phasor estimation is a signal-processing method that computes the magnitude and phase angle of fundamental-frequency voltage or current waveforms, used in power system monitoring, control, and protection.
Phasor measurement unit
A phasor measurement unit, also called a synchrophasor device, is a precision instrument that measures voltage and current phasors and frequency in power grids with GPS time-stamping.
Philip R. Clark
Philip R. Clark was an American nuclear power engineer who directed the Three Mile Island Unit 2 cleanup as president and CEO of GPU Nuclear Corporation.
Pierre Bornard
Pierre Bornard is a French electric power engineer who was deputy chief executive of RTE, chaired the ENTSO-E board, and joined the US National Academy of Engineering in 2024.
Pierre M. Ailleret
Pierre M. Ailleret (1900–1996) was a French electrical engineer who directed the interconnection of France's regional power grids and helped shape Électricité de France after 1946.
PJM Demand Response
PJM Demand Response is a set of voluntary programs that pay electricity customers for reducing their use when PJM requests it during high prices or grid emergencies.
PJM Interconnection
PJM Interconnection is a regional transmission organization that coordinates wholesale electricity across parts of 13 states and DC, serving 67 million people from its founding in 1927.
Planar transformer
A planar transformer is a transformer whose primary and secondary windings are flat copper traces etched on a printed circuit board, used in compact, high-frequency power converters.
Pollution flashover
Pollution flashover is an unwanted electrical discharge across the surface of an outdoor insulator coated with conductive pollution, typically sea salt, industrial dust, or desert sand, and then dampened.
Polskie Sieci Elektroenergetyczne
Polskie Sieci Elektroenergetyczne (PSE) is the sole transmission system operator of Poland, wholly owned by the State Treasury, operating about 16,500 km of extra-high-voltage lines and cross-border interconnections.
Porcelain insulator
A porcelain insulator is a ceramic electrical insulator made of vitrified porcelain, used to support and isolate overhead power line conductors and substations; wet-process designs dominated high-voltage use after 1896.
Portland General Electric
Portland General Electric (PGE) is an investor-owned electric utility headquartered in Portland, Oregon, serving about 960,000 retail customers and ranking as Oregon's largest electricity supplier.
POSCO ENERGY
POSCO ENERGY (포스코에너지) was the energy subsidiary of South Korea's POSCO Group. Founded in 1969, it worked in power generation, fuel cells, and LNG before merging into POSCO International in 2023.
Potomac Edison
The Potomac Edison Company is an investor-owned electric utility headquartered in Williamsport, Maryland, serving about 295,000 customers in western Maryland and 155,000 in West Virginia's Eastern Panhandle as a subsidiary of FirstEnergy.