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Hydrotalcite catalyst
Hydrotalcite catalyst is a layered magnesium–aluminum hydroxide (layered double hydroxide) used as a reusable heterogeneous solid base catalyst, above all for transesterifying vegetable oils and waste fats into biodiesel.
Hydrothermal gasification
Hydrothermal gasification is a thermochemical conversion method that reacts wet biomass or organic waste in hot, pressurized water to produce gas rich in hydrogen or methane, with pilot plants only.
Hydrothermal liquefaction of plastics
Hydrothermal liquefaction of plastics (plastic HTL) is a thermochemical recycling process that decomposes waste polymers in hot, pressurized water into an oil refined into fuels and chemicals.
Hydrotreated vegetable oil
Hydrotreated vegetable oil (HVO), also known as renewable diesel or green diesel, is a liquid biofuel made by hydrogenating vegetable oils and waste fats, usable in diesel engines without modification.
Hydrovolt
Hydrovolt is a Norwegian battery recycling company founded in 2020 as a joint venture of Hydro and Northvolt, operating Europe's largest EV battery recycling plant in Fredrikstad.
Hyliion Holdings
Hyliion Holdings is a Texas-based power technology company founded by Thomas Healy in 2015 that builds the KARNO Power Module, a fuel-agnostic linear generator running on more than 20 fuels.
HyNet (North West England)
HyNet North West is an industrial decarbonisation project in North West England and North Wales that captures and stores industrial CO2 and produces low carbon hydrogen, selected in 2021 as a UK CCUS cluster.
HyperStrong
HyperStrong (Beijing HyperStrong Technology, 海博思创) is a Chinese battery energy storage integrator founded in 2011, with over 400 projects, 70 GWh deployed, and a 2025 STAR Market listing.
HysetCo
HysetCo is a French hydrogen-mobility startup, formed in 2019 by Air Liquide, Idex, STEP, and Toyota, that runs hydrogen stations in Paris and leases hydrogen taxis.
Hysteresis in perovskite solar cells
Hysteresis in perovskite solar cells is the dependence of a cell's measured efficiency on the direction and rate of the voltage sweep, first reported in 2014.
Hyundai Gamma engine
The Hyundai Gamma engine is a family of 1.4- and 1.6-liter four-cylinder petrol engines that Hyundai developed in 2006 for compact cars like the Accent and Elantra.
Hyundai Nexo
The Hyundai Nexo (넥쏘) is a mid-size hydrogen fuel cell electric SUV built by Hyundai of South Korea, Hyundai's second commercially produced fuel cell vehicle, debuted at CES 2018.
Hywind spar floating foundation
The Hywind spar is a floating offshore wind turbine foundation developed by Equinor, basis of the first floating wind turbine in 2009 and the first floating wind farm.
I-REC
The I-REC (International Renewable Energy Certificate) is an energy attribute certificate representing the environmental attributes of 1 MWh of renewable electricity, letting holders claim renewable consumption.
I. Harry Mandil
I. Harry Mandil (1919–2006) was an American nuclear engineer who designed reactor cores for the Navy's nuclear fleet and the first US commercial nuclear power station at Shippingport.
I/R Oil Field
The I/R Oil Field, also written I&R or Irwan, is an onshore oil field in the Murzuq Basin of southwest Libya, discovered in 2005 and producing since 2008.
IAEA PRIS
IAEA PRIS, the Power Reactor Information System, is the International Atomic Energy Agency's worldwide database of nuclear power reactors, the reference source for official statistics on nuclear power since 1969.
IAEA Safety Standards Series
The IAEA Safety Standards Series is the publication series through which the International Atomic Energy Agency establishes safety standards, in three categories: Safety Fundamentals, Safety Requirements, and Safety Guides.
Iatan Generating Station
The Iatan Generating Station is a jointly owned coal-fired power plant near Weston, Missouri, northwest of Kansas City, whose two units total 1,753.9 MW and are operated by Evergy.
Ib Valley Thermal Power Station
Ib Valley Thermal Power Station, also called Ib Thermal Power Station, is a coal-fired power station in Jharsuguda district, Odisha, India, with a capacity of 1,740 MW.
Ibri Independent power plant
The Ibri Independent Power Plant (Ibri IPP) is a 1,509 MW natural-gas-fired combined cycle power station at Ibri in Oman, owned by a Mitsui-led consortium and in operation since 2019.
İÇDAŞ Bekirli power station
The İÇDAŞ Bekirli power station is a 1,200 MW imported hard coal-fired plant in Biga, Çanakkale Province, Turkey, with two supercritical units commissioned in 2011 and 2014.
Ice condenser containment
Ice condenser containment is a Westinghouse pressure-suppression design for pressurized water reactors in which a large ice inventory absorbs steam energy, allowing a smaller, lower-pressure containment building.
Ice dam
An ice dam is a ridge of ice, often with icicles, that forms at a roof's eaves when meltwater refreezes, backing water up under the roofing into the building.
Ice Energy
Ice Energy is an American energy storage company founded in 2003, known for the Ice Bear, which makes ice overnight to cool buildings without running the AC compressor.
Ice Harbor Dam
Ice Harbor Dam is a hydroelectric and navigation dam on the lower Snake River in southeast Washington, the first and furthest downriver of the four lower Snake River dams.
Ice shedding
Ice shedding is the sudden detachment of ice from overhead transmission line conductors due to melting, wind, or de-icing, causing jumping conductors, flashovers, and tower damage.
Iceland Deep Drilling Project
The Iceland Deep Drilling Project is an Icelandic research consortium drilling deep wells into volcanic geothermal systems to test whether superhot fluids can generate power economically.
Ichthys Gas Pipeline
The Ichthys Gas Export Pipeline is a 42-inch subsea gas pipeline about 890 kilometers long, running from the Browse Basin off Western Australia to Darwin.
Ichthys LNG project
The Ichthys LNG project is a liquefied natural gas development operated by Japan's INPEX, drawing gas from the Ichthys field off Western Australia and processing it near Darwin since 2018.