Energy and Commodities
Encyclopedia of energy and commodities terms covering the oil and gas value chain from exploration through retail, plus renewables and the energy transition.
Carbon Capture and Storage
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“Carbon capture is not a silver bullet, but it is an essential part of the portfolio of solutions we need.”
— Fatih Birol
Definition: Carbon capture and storage (CCS) is a technology process that captures carbon dioxide (CO2) emissions produced from industrial processes or power generation before they enter the atmosphere, transports the captured CO2, and stores it deep underground in geological formations. CCS is considered a critical technology for mitigating climate change, particularly in hard-to-abate sectors like cement, steel, and petrochemicals where eliminating emissions entirely is technically challenging. The technology can also be combined with bioenergy to achieve net-negative emissions.
In context: Chevron Corporation (CVX, a US equity index) engages in “carbon capture and storage” in its Upstream segment. Exxon Mobil (XOM, a US equity index) pursues “lower-emission and business opportunities, including carbon capture and storage, hydrogen, lower-emission fuels.”
Real-world example: An oil company captures CO2 from its natural gas processing plant in Western Australia, compresses it, and injects it into a deep geological formation two kilometers underground, permanently storing millions of tonnes of CO2 that would otherwise have been released into the atmosphere.
Related terms: Green Hydrogen, Renewable Energy, Upstream, Downstream, Net-Zero
Cogeneration
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“The cheapest energy is the energy you never waste.”
— Amory Lovins
Definition: Cogeneration, also known as combined heat and power (CHP), is the simultaneous production of electricity and useful heat from a single fuel source. By capturing and using heat that would otherwise be wasted in conventional power generation, cogeneration plants can achieve total energy efficiencies of 80% or more, compared to about 35-50% for conventional power plants. This technology is widely used in industrial settings where both electricity and steam or hot water are needed.
In context: L’Air Liquide (AI.PA, a European equity index) “operates cogeneration plants to supply steam and electricity to metals, chemicals, refining, and energy industries” as part of its large industries business.
Real-world example: A chemical factory installs a cogeneration system that burns natural gas to generate electricity for its production lines. The waste heat from the gas turbine is captured and used to produce steam for the factory’s chemical processes, reducing the facility’s overall fuel consumption by 30%.
Related terms: Renewable Energy, Upstream, Downstream, Energy Storage
Commodity Trading
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“The speculator’s chief enemies are ignorance, greed, fear, and hope.”
— Jesse Livermore, Reminiscences of a Stock Operator (1923)
Definition: Commodity trading is the buying and selling of raw materials and primary products such as crude oil, natural gas, metals, agricultural products, and other physical goods. Commodity trading occurs on specialized exchanges (like the Chicago Mercantile Exchange or London Metal Exchange) and through over-the-counter markets. Traders may deal in physical commodities (actual delivery) or financial derivatives (futures, options, and swaps) based on commodity prices. Companies involved in commodity trading include energy companies, mining firms, agricultural conglomerates, and specialized trading houses.
In context: BASF SE (BAS.DE, a European equity index) “engages in…commodity trading activities.” BHP Group (BHP.AX, an Asia-Pacific equity index) provides “marketing and trading” services for its mining products. ITOCHU Corporation (8001.T, an Asia-Pacific equity index) trades in “crude oil, petroleum product, LPG, LNG, natural gas, hydrogen” and other commodities across its Energy & Chemicals segment. Mitsui & Co. (8031.T, an Asia-Pacific equity index) engages in “trading and marketing of oil, petroleum products, coal, and uranium.”
Real-world example: A commodities trading firm buys 1 million barrels of crude oil in the Middle East at USD 75 per barrel, arranges tanker transportation, and sells the oil to a refinery in Asia at USD 77 per barrel, earning a profit on the price differential while managing logistics and price risk through hedging with futures contracts.
Related terms: Futures and Options, Derivatives, Upstream, Refining
Downstream
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“The value of a barrel of crude oil is unlocked only when it reaches the refinery — downstream is where the margin lives.”
— Daniel Yergin, The New Map (2020)
Definition: In the energy industry, downstream refers to the activities that occur after the production phase and are closer to the end consumer. Downstream operations include refining crude oil into usable products (gasoline, diesel, jet fuel, petrochemicals), marketing and distributing these refined products to consumers and businesses, and operating retail fuel stations. Downstream is distinct from upstream (exploration and production of crude resources) and midstream (transportation and storage of raw resources).
In context: Chevron Corporation (CVX, a US equity index) operates a Downstream segment that “refines crude oil into petroleum products; markets crude oil, refined products, and lubricants; manufactures and markets renewable fuels.” TotalEnergies (TTE.PA, a European equity index) has a “Refining & Chemicals” segment handling downstream activities. Exxon Mobil (XOM, a US equity index) operates “Energy Products” and “Chemical Products” segments.
Real-world example: After crude oil is extracted from an offshore platform (upstream) and transported by pipeline to a coastal terminal (midstream), a refinery processes it into gasoline, diesel, and jet fuel (downstream). These refined products are then delivered to gas stations and airports for sale to consumers.
Related terms: Upstream, Midstream, Refining, Petrochemicals
Energy Storage
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“The holy grail of energy is storage — once we solve storage, we solve renewables.”
— Elon Musk
Definition: Energy storage refers to the capture of energy produced at one time for use at a later time. Energy storage technologies include batteries (lithium-ion, solid-state), pumped hydro, compressed air, and thermal storage. Energy storage is critical for the integration of renewable energy sources like solar and wind, which are intermittent by nature. By storing excess energy generated during peak production periods and releasing it during high-demand periods, energy storage systems help balance the electrical grid, improve reliability, and reduce reliance on fossil fuel backup generation.
In context: Tesla, Inc. (TSLA, a US equity index) provides “lithium-ion battery energy storage products, such as Powerwall and Megapack.” Siemens Energy (ENR.DE, a European equity index) offers “batteries and fuel cells.” Iberdrola (IBE.MC, a European equity index) generates electricity “through batteries” as part of its renewable energy mix.
Real-world example: A solar farm generates more electricity than the grid needs during sunny midday hours. The excess energy charges a Tesla Megapack battery storage system on site. In the evening when solar production drops but demand peaks, the stored energy is discharged into the grid, providing clean electricity when it is needed most.
Related terms: Renewable Energy, Carbon Capture and Storage, Green Hydrogen
Green Hydrogen
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“Green hydrogen is the missing piece of the puzzle for full decarbonization.”
— Frans Timmermans
Definition: Green hydrogen is hydrogen produced through the electrolysis of water using renewable energy sources such as wind or solar power. Unlike grey hydrogen (produced from natural gas) or blue hydrogen (produced from natural gas with carbon capture), green hydrogen produces no carbon emissions during its production. It is considered a key enabler of the energy transition, particularly for decarbonizing hard-to-abate sectors like heavy industry, long-distance transportation, and high-temperature industrial processes.
In context: Iberdrola (IBE.MC, a European equity index) is involved in the “production of green hydrogen” and offers “supplies green H2” to industrial customers. L’Air Liquide (AI.PA, a European equity index) “designs hydrogen refueling stations” in its Global Markets & Technologies segment. Siemens Energy (ENR.DE, a European equity index) offers “electrolyzers” for hydrogen production.
Real-world example: A wind farm in Northern Europe produces excess electricity on windy days. Instead of curtailing (wasting) this excess power, it powers an electrolyzer that splits water into hydrogen and oxygen. The green hydrogen is compressed and transported to a nearby steel plant, where it replaces coal as a reducing agent in the steelmaking process.
Related terms: Renewable Energy, Carbon Capture and Storage, Energy Storage, Cogeneration, Net-Zero
Liquefied Natural Gas (LNG)
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“LNG is the bridge fuel that can help the world transition to a lower-carbon energy system.”
— Daniel Yergin, The Prize (1991)
Definition: Liquefied natural gas (LNG) is natural gas that has been cooled to approximately -162 degrees Celsius (-260 degrees Fahrenheit), converting it to a liquid state for storage and transportation. LNG occupies about 1/600th of the volume of natural gas in its gaseous state, making it economically feasible to transport across oceans in specially designed tankers to markets that are not connected by pipelines. At its destination, LNG is regasified (converted back to gas) and distributed through local pipeline networks. LNG plays a critical role in global energy trade and energy security.
In context: Eni S.p.A. (ENI.MI, a European equity index) is involved in “international transport, and purchase and marketing of liquefied natural gas.” TotalEnergies (TTE.PA, a European equity index) operates an “Integrated LNG” segment comprising “upstream and midstream liquified natural gas (LNG) activities.” Chevron (CVX, a US equity index) engages in “liquefaction, transportation, and regasification of liquefied natural gas.” Woodside Energy (WDS.AX, an Asia-Pacific equity index) “produces liquefied natural gas” as a core product.
Real-world example: An LNG producer in Qatar cools natural gas to liquid form, loads it onto a specialized tanker, and ships it to a regasification terminal in Japan. There, the LNG is warmed back to gas and fed into Japan’s pipeline network, providing fuel for power plants and heating systems.
Related terms: Upstream, Midstream, Downstream, Commodity Trading, Pipeline (Energy)
Midstream
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“Pipelines are the arteries of the energy system — they keep everything flowing.”
— Russell Gold, The Boom (2014)
Definition: In the energy industry, midstream refers to the activities that connect upstream production with downstream processing and consumption. Midstream operations include the transportation, storage, and wholesale marketing of crude oil, natural gas, natural gas liquids, and other hydrocarbons. Infrastructure assets include pipelines, tanker ships, rail cars, storage terminals, and processing plants. Midstream companies typically earn revenues based on throughput volumes rather than commodity prices, providing more stable and predictable cash flows than upstream operations.
In context: TotalEnergies (TTE.PA, a European equity index) includes “upstream and midstream liquified natural gas (LNG) activities” in its Integrated LNG segment. Eni S.p.A. (ENI.MI, a European equity index) is involved in “international transport” of natural gas, a midstream activity. Chevron (CVX, a US equity index) engages in “transportation of crude oil through pipelines” and “transportation, storage, and marketing of natural gas.”
Real-world example: A midstream company operates a 1,500-kilometer pipeline that transports crude oil from production wells in West Texas to refineries on the Gulf Coast. The company charges oil producers a per-barrel transportation fee, earning steady revenue regardless of whether oil prices are high or low.
Related terms: Upstream, Downstream, Pipeline (Energy), Liquefied Natural Gas (LNG)
Petrochemicals
Definition: Petrochemicals are chemical products derived from petroleum (crude oil) and natural gas through processes such as cracking, reforming, and distillation. They serve as the building blocks for a vast range of products including plastics, synthetic fibers, rubbers, detergents, fertilizers, pharmaceuticals, and paints. The petrochemical industry is one of the largest sectors of the global economy, and its products are integral to modern life. Major petrochemical products include ethylene, propylene, benzene, toluene, xylene, and methanol.
In context: BASF SE (BAS.DE, a European equity index) provides “petrochemicals and intermediates” through its Chemicals segment. Eni S.p.A. (ENI.MI, a European equity index) produces “basic chemical and petrochemical products, intermediates, plastics and elastomers.” Exxon Mobil (XOM, a US equity index) is “involved in the manufacture, trade, transport, and sale of…petrochemicals.” ITOCHU Corporation (8001.T, an Asia-Pacific equity index) trades in “organic and inorganic chemicals” and “petrochemicals.”
Real-world example: A petrochemical plant uses ethylene (derived from natural gas) to produce polyethylene, the world’s most common plastic. This polyethylene is then sold to manufacturers who transform it into plastic bags, food containers, water pipes, and packaging materials that consumers use every day.
Related terms: Downstream, Refining
Pipeline (Energy)
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“A pipeline is a river of energy flowing underground — once built, it earns toll-like revenue for decades.”
— T. Boone Pickens
Definition: In the energy industry, a pipeline is a network of pipes used to transport crude oil, natural gas, refined petroleum products, or other fluids over long distances from production sites to processing facilities, storage terminals, or end consumers. Pipelines are the most efficient and cost-effective method for transporting large volumes of oil and gas overland. Pipeline infrastructure requires significant capital investment and is typically regulated by government authorities. Pipeline companies often operate under long-term contracts with fixed or formula-based tariffs.
In context: Eni S.p.A. (ENI.MI, a European equity index) is involved in “supply and sale of wholesale natural gas through pipeline.” Chevron (CVX, a US equity index) engages in “transportation of crude oil through pipelines” and “transportation, storage, and marketing of natural gas.” Berkshire Hathaway (BRK-B, a US equity index) “operates…interstate pipelines, liquefied natural gas facilities, and compressor and meter stations.”
Real-world example: A natural gas pipeline stretches 3,000 kilometers from a gas field in western Siberia to a distribution hub in Germany. Compressor stations spaced every 200 kilometers maintain pressure to keep the gas flowing. The pipeline operator charges gas producers a per-cubic-meter tariff for transportation, earning predictable revenue over a 30-year contract.
Related terms: Midstream, Upstream, Liquefied Natural Gas (LNG)
Refining
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“A refinery is the nexus between the raw material and the consumer product — the crack spread is the heartbeat of the oil industry.”
— Philip Verleger
Definition: Refining is the industrial process of transforming crude oil into usable petroleum products through distillation, cracking, reforming, and treatment processes. Refineries produce a range of products including gasoline, diesel fuel, jet fuel, heating oil, lubricants, asphalt, and petrochemical feedstocks. The refining margin (the difference between crude oil input costs and the value of refined product output) is a key profitability metric. Refining is a capital-intensive, highly regulated industry that is central to the global energy supply chain.
In context: TotalEnergies (TTE.PA, a European equity index) has a “Refining & Chemicals” segment involved in “refining, petrochemicals, and specialty chemicals.” Chevron (CVX, a US equity index) in its Downstream segment “refines crude oil into petroleum products.” Exxon Mobil (XOM, a US equity index) engages in the “manufacture…of crude oil, natural gas, petroleum products.” L’Air Liquide (AI.PA, a European equity index) supplies gases to the “refining” industry.
Real-world example: A refinery in Texas processes 300,000 barrels of crude oil per day. The crude oil enters a distillation tower where it is heated and separated into different products based on boiling points: lighter gases rise to the top, gasoline and jet fuel are collected in the middle, and heavier products like diesel and asphalt are drawn from the bottom. The refinery earns profit based on the spread between crude oil costs and refined product prices.
Related terms: Downstream, Petrochemicals, Upstream, Commodity Trading
Renewable Energy
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“The stone age didn’t end because we ran out of stones. The oil age won’t end because we run out of oil.”
— Ahmed Zaki Yamani
Definition: Renewable energy is energy derived from natural sources that are replenished at a rate faster than they are consumed, including solar, wind, hydroelectric, geothermal, tidal, and biomass energy. Unlike fossil fuels (coal, oil, natural gas), renewable energy sources produce little to no greenhouse gas emissions during operation, making them crucial for addressing climate change. The renewable energy sector has grown rapidly due to declining technology costs, supportive government policies, and increasing environmental awareness.
In context: Enel SpA (ENEL.MI, a European equity index) “operates renewable, nuclear, wind, hydroelectric, thermal, solar, and geothermal power plants.” Iberdrola (IBE.MC, a European equity index) “generates electricity from renewable sources, such as onshore and offshore wind, photovoltaic, hydro.” Siemens Energy (ENR.DE, a European equity index) provides “onshore and offshore wind turbines.” BASF SE (BAS.DE, a European equity index) engages in “renewable energy trading.”
Real-world example: A utility company builds a 500 MW offshore wind farm in the North Sea consisting of 50 wind turbines. The wind farm generates enough clean electricity to power 350,000 homes annually, displacing approximately 700,000 tonnes of CO2 emissions per year compared to gas-fired power generation.
Related terms: Green Hydrogen, Carbon Capture and Storage, Energy Storage, Cogeneration, ESG
Upstream
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“The meek shall inherit the earth, but not its mineral rights.”
— J. Paul Getty
Definition: In the energy industry, upstream refers to the exploration for and production (E&P) of crude oil and natural gas. Upstream activities include geological surveys, seismic testing, exploratory drilling, well development, production operations, and well decommissioning. Upstream is the first stage of the oil and gas value chain, preceding midstream (transportation and storage) and downstream (refining and distribution). Upstream companies face significant risks including exploration failure, price volatility, geopolitical instability, and environmental regulations.
In context: TotalEnergies (TTE.PA, a European equity index) has an “Exploration & Production” segment for upstream activities and “upstream and midstream liquified natural gas (LNG) activities.” Chevron (CVX, a US equity index) has an “Upstream segment” that “engages in the exploration for, development, production, and transportation of crude oil and natural gas.” Exxon Mobil (XOM, a US equity index) has an Upstream segment that “explores for and produces crude oil and natural gas.” Eni S.p.A. (ENI.MI, a European equity index) operates an “Exploration & Production” segment.
Real-world example: An oil company identifies a promising geological formation beneath the seabed off the coast of Brazil. It spends USD 100 million on seismic surveys, drills exploratory wells at USD 50 million each, discovers a commercially viable oil reservoir, and then invests USD 5 billion to develop the field and begin production of 100,000 barrels per day.
Related terms: Midstream, Downstream, Refining, Liquefied Natural Gas (LNG)