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Metal-organic framework thermal energy storage
Metal-organic framework thermal energy storage stores and releases heat using MOFs, porous crystals that hold phase change materials in their pores or act as adsorbents in heat-storage cycles.
Metal–air battery
A metal–air battery is an electrochemical cell that oxidizes a metal anode while drawing its cathode oxygen from the air, giving it some of the highest theoretical energy densities of any battery family.
Metal–organic framework hydrogen storage
Metal–organic framework hydrogen storage stores hydrogen by physisorption inside metal–organic frameworks, porous crystalline materials with tunable pores and exceptionally high surface areas studied intensively as adsorbents since 2003.
Metallic uranium fuel
Metallic uranium fuel is nuclear fuel made of uranium metal or alloys such as U-Zr and U-Mo rather than ceramic uranium dioxide, used mainly in fast and research reactors.
Methanation (hydrogen purification)
Methanation is a catalytic hydrogen purification process converting residual carbon monoxide and carbon dioxide into methane and water, used in ammonia plants and for fuel cell hydrogen.
Methane dehydroaromatization
Methane dehydroaromatization (MDA) is a non-oxidative catalytic reaction that converts methane directly into benzene and hydrogen, first reported in 1993 over a molybdenum-modified zeolite catalyst and still not commercially implemented.
Methane fermentation
Methane fermentation is anaerobic digestion in which communities of microorganisms break down manure, sewage sludge, and food waste into biogas, a methane-rich fuel mixture typically containing 55–65% methane.
Methane pyrolysis
Methane pyrolysis, also called methane decomposition or methane cracking, is a process splitting methane into hydrogen and solid carbon without CO2, yielding turquoise hydrogen at temperatures of 800 to 1600 °C.
Methane storage
Methane storage is the containment of methane, the main component of natural gas, at densities high enough for practical transport and use, most often as a vehicle fuel.
Methanex
Methanex Corporation is a Vancouver-based chemical company and the world's largest methanol producer, operating plants in the United States, Chile, Trinidad and Tobago, New Zealand, Egypt, and Canada.
Methanol fuel
Methanol fuel, also known as wood alcohol, is methanol (CH₃OH) used as a fuel for internal combustion engines, fuel cells, and increasingly ships, where it cuts sulfur and particulate emissions.
Methanol steam reforming
Methanol steam reforming (MSR) is the catalytic reaction of methanol with steam to produce hydrogen and carbon dioxide, run at 200 to 300 °C over copper catalysts to supply PEM fuel cells.
Methanol-to-jet
Methanol-to-jet is a process route for making sustainable aviation fuel from methanol built from renewable hydrogen and captured CO₂ or biomass, related to methanol-to-gasoline and under ASTM D7566 review.
Methylammonium lead iodide
Methylammonium lead iodide (CH₃NH₃PbI₃, commonly abbreviated MAPbI₃) is a hybrid organic–inorganic perovskite semiconductor that debuted in solar cells at 3.8% efficiency in 2009 and became the most studied perovskite light absorber.
Methylcyclohexane
Methylcyclohexane, also called hexahydrotoluene, is a cycloalkane produced by hydrogenating toluene; it stores hydrogen for shipment in ordinary fuel infrastructure and released 210 tons delivered from Brunei to Japan in 2020.
Metlen Energy & Metals
Metlen Energy & Metals, previously MYTILINEOS, is a Greek industrial and energy company founded in 1990 that operates in power generation, retail electricity supply, renewables, and aluminum production, and joined the FTSE 100 in 2025.
Metsä Group
Metsä Group is a Finnish forest industry group whose parent, Metsäliitto Cooperative, is owned by some 90,000 forest owners; it had 2025 sales of EUR 5.8 billion.
Mettiki Coal
Mettiki Coal is an underground longwall coal-mining complex of Alliance Resource Partners, pairing the Mountain View mine in Tucker County, West Virginia with a preparation plant near Oakland, Maryland.
Mettiki General Coal Mine
The Mettiki General Coal Mine was a large underground coal mine in Garrett County, Maryland, which operated from 1977 until its reserves were exhausted in 2006.
Mettur Thermal Power Station
Mettur Thermal Power Station (MTPS) is a coal-fired power station in Mettur, Tamil Nadu, India, with four 210 MW units and a 600 MW unit, owned by TNPGCL.
Mexican Eagle Oil
Mexican Eagle Oil (Compañía Mexicana de Petróleo El Águila) was an oil company founded by Weetman Pearson that dominated Mexican petroleum until Shell bought control in 1919.
Mexilhão Oil and Gas Field
Mexilhão is a natural gas and condensate field in the Santos Basin, offshore São Paulo, Brazil. Operated by Petrobras, it is one of Brazil's largest gas producers.
Meyer Burger Technology
Meyer Burger Technology is a Swiss solar technology company headquartered in Thun, founded in 1953, which became a manufacturer of heterojunction solar cells and modules before entering insolvency in 2025.
MeyGen
MeyGen is a tidal stream energy project in the Pentland Firth, Scotland, operating four seabed turbines since 2018 and leased for up to 398 MW.
Mg3(Bi,Sb)2 thermoelectric modules
Mg3(Bi,Sb)2 thermoelectric modules are solid-state devices that convert heat into electricity or pump heat for cooling, offering a tellurium-free alternative to bismuth telluride (Bi2Te3) modules.
MGE Energy
MGE Energy, Inc. is a Madison, Wisconsin utility holding company trading on NASDAQ as MGEE, the parent of Madison Gas and Electric, which serves south-central and western Wisconsin.
MGP (gas trading point)
The MGP, formally the Hungarian Virtual Trading Point, is Hungary's virtual gas trading hub on the high-pressure network, operated by FGSZ Ltd., where CEEGEX trades are settled.
Miami Fort Station
Miami Fort Station, also called the Miami Fort Power Plant, is a coal-fired power station in North Bend, Ohio, on the Ohio River near Cincinnati.
Miandoum Oil Field
Miandoum Oil Field is an onshore oil field in the Doba Basin of southern Chad, discovered in 1975 and the first Doba field to produce, in July 2003.
Miaowei hydroelectric plant
Miaowei hydroelectric plant (苗尾水电站) is a 1,400 MW hydropower station on the upper Lancang (Mekong) River in Yunlong County, Yunnan, China, fully commissioned in June 2018.