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Princeton Plasma Physics Laboratory
The Princeton Plasma Physics Laboratory, also known as Project Matterhorn, is a US Department of Energy fusion research lab in Princeton, New Jersey, managed by Princeton University.
Prirazlomnoye Oil Field
Prirazlomnoye is an offshore oil field on the Pechora Sea shelf in the Russian Arctic, discovered in 1989 and producing since December 2013 from the ice-resistant platform Prirazlomnaya.
Prismatic cell
A prismatic cell is a lithium-ion battery cell in a flat, rectangular rigid housing, a format whose efficient stacking makes it the most widely used in electric vehicle and stationary storage batteries.
Proálcool
Proálcool (Programa Nacional do Álcool) was a Brazilian government program launched in 1975 to replace petroleum fuels with ethanol from sugarcane, becoming the world's largest biofuels program.
Probabilistic solar forecasting
Probabilistic solar forecasting predicts future solar irradiance or photovoltaic power output as a probability distribution rather than a single value, quantifying uncertainty for grid operators, utilities, and market decisions.
Procel
Procel, the National Program for the Conservation of Electric Energy, is Brazil's federal electricity-efficiency program, created in 1985 and coordinated by the Ministry of Mines and Energy.
Production logging
Production logging is the set of downhole measurements, run in a producing or injecting well with the well flowing, that shows which zones contribute flow, where water or gas enters, and where leaks or channels exist.
Production sharing agreement
A production sharing agreement (PSA) is an oil contract where a company finances exploration at its own risk and receives a share of production, pioneered by Indonesia in 1966.
Production tax credit (United States)
The production tax credit (PTC) is a US federal tax credit per kilowatt-hour of electricity from qualified energy resources, created by the Energy Policy Act of 1992.
Programa Brasileiro de Etiquetagem
The Programa Brasileiro de Etiquetagem (PBE), Brazil's national energy efficiency labeling program, has been run by Inmetro since 1984, rating products from class A to G.
Progress pipeline
The Progress pipeline (Газопровод «Прогресс»), also called the Yamburg–Western Border of the USSR gas pipeline, runs from the Yamburg gas field to Uzhgorod on the Ukrainian–Slovak border.
Project Independence
Project Independence was a United States energy program announced by President Richard Nixon in November 1973, seeking energy self-sufficiency by 1980 after the Arab oil embargo.
Project Red (geothermal)
Project Red is Fervo Energy's enhanced geothermal system pilot near Winnemucca, Nevada, the first commercial EGS to deliver electricity to a grid, powering Google data centers from 2023.
Promigas Pipeline Network
The Promigas Pipeline Network is the natural gas transportation system operated by Promigas, a Colombian utility founded in 1974 and headquartered in Barranquilla, carrying about 56% of Colombia's gas.
Propane heat pump
A propane heat pump is a heat pump using propane, or R290, as its refrigerant instead of synthetic fluorinated gases, cutting climate impact but requiring safety measures for its flammability.
ProPetro
ProPetro Holding Corp. is a Midland, Texas-based oilfield services company founded in 2005 that provides hydraulic fracturing, wireline, cementing, and power generation services to producers in the Permian Basin.
Prosafe
Prosafe is a Stavanger-based Norwegian offshore services company that owns semi-submersible accommodation vessels housing workers next to oil and gas installations, listed on Euronext Oslo Børs.
Protective earth (ground)
A protective earth, or equipment ground, is a conductor connecting exposed metal parts of equipment to earth so an insulation fault cannot leave them at a dangerous voltage.
Protective relay
A protective relay, also called a protection relay, is a device that monitors current and voltage, detects faults, and trips circuit breakers to isolate the faulted section.
Proton exchange membrane water electrolysis
Proton exchange membrane water electrolysis (PEM electrolysis) is an electrochemical method of splitting water into hydrogen and oxygen with a solid polymer membrane as the electrolyte, operating at about 70–90 °C.
Proton-conducting solid oxide electrolysis cells
Proton-conducting solid oxide electrolysis cells (PCECs), also called protonic ceramic electrolysis cells or P-SOECs, are electrochemical devices that split steam into pure hydrogen at intermediate temperatures of roughly 400–700 °C.
Proton-exchange membrane fuel cell
A proton-exchange membrane fuel cell (PEMFC) is an electrochemical device that converts hydrogen and oxygen into electricity through a thin polymer membrane, powering most small stationary fuel cells by count.
Prototype Fast Breeder Reactor
The Prototype Fast Breeder Reactor (PFBR) is a 500 MWe sodium-cooled fast breeder reactor at Kalpakkam, Tamil Nadu, India, designed by IGCAR and built by BHAVINI.
Prototype Fast Reactor
The Prototype Fast Reactor (PFR) was a sodium-cooled fast reactor at Dounreay, Scotland, built by the UK Atomic Energy Authority and operated from 1974 to 1994.
Proved reserves
Proved reserves are oil and gas quantities demonstrated with reasonable certainty to be commercially recoverable from known reservoirs, the most conservative tier of petroleum reserve classification.
Provincial Electricity Authority
The Provincial Electricity Authority (การไฟฟ้าส่วนภูมิภาค; PEA) is a Thai state enterprise, established in 1960, that buys bulk electricity and distributes it to over 20 million customers across 74 of Thailand's 77 provinces.
Provisional Measure No. 1,340
Provisional Measure No. 1,340 (Medida Provisória nº 1.340) was a 2026 Brazilian measure subsidizing road diesel at R$ 0.32 per liter; it lapsed in July 2026.
Proxima Fusion
Proxima Fusion is a Munich-based fusion startup founded in 2023 as the first spin-out of the Max Planck Institute for Plasma Physics, developing stellarator power plants.
Prudhoe Bay Oil Field
Prudhoe Bay Oil Field is a giant oil field on Alaska's Arctic coast, discovered in 1968 by ARCO and Humble Oil; it is the largest oil field in North America.
Prussian blue analogue cathode
A Prussian blue analog cathode is a positive electrode for rechargeable batteries, mainly sodium-ion cells, built on the open cyanide-bridged framework of Prussian blue and made cheaply by aqueous synthesis.