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- J. P. Pulliam Generating StationElectrical power station in Green Bay, Brown County, WIsconsin
- Jack-o'-lanternCarved pumpkin or root vegetable lantern
- Jackup rigA jackup rig or a self-elevating unit is a type of mobile platform that consists of a buoy
- James Bay ProjectHydroelectric dams in Quebec, Canada
- James DehlsenJames G.P. Dehlsen (born April 27, 1937) is an American businessman, inventor, and entrepr
- Jamnagar refineryOil refinery in Gujarat, India
- Jännersdorf Solar ParkThe Jännersdorf Solar Park is a photovoltaic power station in Prignitz, Germany. It has a
- Japan Nuclear Fuel LimitedJapan Nuclear Fuel Ltd. (JNFL) (日本原燃 Nihon Gennen) is a nuclear energy company based in Ro
- Japan–Korea Joint Development ZoneOil-rich area in the East China Sea
- Japan's non-nuclear weapons policyJapan's non-nuclear weapons policy is a policy popularly articulated as the Three Non-Nucl
- Japanese reaction to Fukushima nuclear accidentJapanese reaction to the Fukushima nuclear disaster
- Jebel al-Zayt oil spill2010 Egyptian oil spill in the Red Sea
- JenbacherINNIO Jenbacher designs and manufactures gas engines and cogeneration modules in the Austr
- Jet fuelType of aviation fuel
- JharsugudaTown in Odisha, India
- John GofmanJohn William Gofman (21 September 1918 – 15 August 2007) was an American scientist and adv
- JT-60Japanese tokamak
- Jubek StateJubek State was a state in South Sudan that existed between 2 October 2015 and 22 February
- Jules Horowitz ReactorThe Jules Horowitz Reactor (Réacteur Jules Horowitz, RJH) is a materials testing reactor (
- Julius Nyerere Hydropower StationHydroelectric power plant in Morogoro Region, Tanzania