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Latest explainers
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What is district heating? One heating system for an entire city
Most buildings have their own boiler, furnace, or heat pump. District heating asks a very different question: why should every building make heat separately? Produce heat centrally, recover it from places already throwing it away, move it through insulated pipes, and an entire neighborhood—or city—can share one thermal system. The idea is old. What we can feed into those pipes is becoming much more interesting.
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What is LNG? How natural gas learned to cross an ocean
Natural gas has one awkward physical problem: as a gas, it takes up an enormous amount of space. LNG solves that by cooling natural gas to around −162°C, shrinking its volume roughly 600 times and turning a pipeline-bound fuel into something that can cross oceans on ships. That simple phase change quietly transformed natural gas from a regional commodity into a global one.
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What are e-fuels? Turning electricity back into something you can burn
E-fuels do something wonderfully inefficient—and potentially very useful. They take renewable electricity, use it to make hydrogen, combine that hydrogen with captured carbon, and rebuild familiar fuels such as kerosene, methanol, or synthetic diesel. Why bother turning electricity into fuel instead of simply using the electricity? Because some machines are much easier to decarbonize with molecules than electrons.
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What is regenerative braking? The car that charges when you slow down
Every conventional car throws away most of its braking energy as heat. An electric car can do something much stranger: turn its motor into a generator, convert some of that motion back into electricity, and put it into the battery. Regenerative braking is one of the quiet reasons EVs are so efficient—and one of the best examples of energy recovery hiding in everyday life.
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What is geothermal energy? The renewable power plant hiding under your feet
The Earth is hot beneath our feet—hot enough in the right places to heat cities and generate electricity around the clock. Geothermal energy taps that underground heat, but the real story is more interesting than “find a volcano and drill.” New drilling technologies may be turning one of renewable energy’s most geographically limited resources into something much bigger.
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What is a bankable energy project? When a great project finally survives a bank
A renewable project can have excellent wind, secured land, permits, a signed PPA, and attractive returns—and still fail to get financed. Bankability is the point where lenders believe the project can survive construction delays, weak production years, market shocks, contract disputes, and everything else reality might throw at the spreadsheet.
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What is demand response? When the grid asks you to use less electricity
Power systems traditionally solve tight hours by producing more electricity. Demand response flips the problem around: sometimes it is cheaper, faster, and smarter to temporarily use less—or simply use it later. That small change turns factories, air conditioners, water heaters, EV chargers, and eventually millions of homes into flexibility resources.
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What is a Combined-Cycle Gas Turbine? Two turbines, one flame
A combined-cycle gas turbine burns natural gas once but extracts electricity in two stages: first from a gas turbine, then from a steam turbine powered by the hot exhaust the first turbine was about to throw away. That simple act of refusing to waste heat is why CCGTs can reach efficiencies around 60%—and why they still matter in a power system filling up with wind, solar, and batteries.
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What is a heat pump? The heater that refuses to make heat
A heat pump can deliver three or four units of heat while using roughly one unit of electricity. No, it is not breaking physics. The trick is that it does not create most of the heat—it moves heat that was already there. Here is why your refrigerator, air conditioner, and one of the biggest technologies in building decarbonization are basically members of the same family.
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Who was Michael Faraday? The bookbinder who electrified the world
Michael Faraday started life binding other people’s books and ended up discovering the principle behind the generators that power modern civilization. No university degree. Very little mathematics. Quite a lot of electricity.
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