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Latest explainers
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What is electricity balancing? The grid has to get one number right every second
Electricity has one unforgiving rule: generation and consumption must remain in balance in real time. But forecasts are never perfect, power plants trip, demand changes and wind does not read tomorrow’s schedule. Electricity balancing is how the power system continuously closes the gap between what was planned and what actually happens.
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What is industrial heat? The giant energy problem hiding inside factories
Factories do not just need electricity. They need enormous amounts of heat—to dry paper, pasteurize milk, make steam, melt metals, crack chemicals, fire glass and turn limestone into cement. Industrial heat is one of the biggest and least visible parts of the energy system, and decarbonizing it gets harder as the thermometer climbs.
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What are negative electricity prices? When power producers pay you to take their electricity
Electricity is supposed to cost money. Yet wholesale power prices can fall below zero, meaning generators may effectively pay the market to take their electricity. That is not a broken market or free electricity for your house. It is a very loud price signal telling the power system: we have more electricity right now than we know what to do with.
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What is energy? The most important thing in physics that nobody can point to
Energy powers stars, batteries, bodies, power grids, and basically everything that changes. But ask physics what energy actually is, and the answer gets strange fast. Energy is not a substance, not a force, and not simply “the ability to do work.” It is something deeper: a measurable property of physical systems, a conserved quantity tied to the structure of time itself—and, at the frontiers of physics, a concept whose full meaning is still surprisingly unsettled.
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What is an electrolyzer? The machine that turns electricity into hydrogen
An electrolyzer takes electricity, water, and some very deliberate electrochemistry and produces hydrogen and oxygen. That sounds simple enough. The interesting part begins when the machine becomes hundreds of megawatts large, starts following wind and solar production, competes for cheap electricity, needs purified water and compression, and discovers that making hydrogen cheaply is mostly an electricity problem wearing a chemistry badge.
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What is waste heat? The energy we already paid for and then threw away
Factories, power plants, engines, data centers, furnaces, compressors, and even supermarket refrigerators constantly reject heat into the environment. Some of that loss is unavoidable. Some is simply energy leaving the system before we found another useful job for it. Waste heat recovery asks an almost embarrassingly sensible question: if we already paid to create that energy, can we use it again before letting it escape?
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What is energy arbitrage? Buying electricity when nobody wants it
Electricity can be worth €20/MWh at noon and €150/MWh a few hours later. Energy arbitrage turns that difference into a business model: buy or store electricity when it is cheap, then sell it when it becomes valuable. The idea sounds suspiciously like “buy low, sell high.” It is. The interesting part is what batteries, efficiency losses, degradation, forecasts, negative prices, and thousands of competing batteries do to that beautifully simple plan.
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What is black start? How do you restart a grid with no electricity?
A blackout creates a wonderfully circular problem: the grid needs power plants to restart, but many power plants need electricity from the grid before they can start. Black start is how operators break that loop—using specially capable resources to create the first energized islands, start larger generators, reconnect transmission lines and loads, synchronize those islands, and gradually rebuild an entire power system from darkness.
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What is thermal energy storage? The battery that stores heat instead of electricity
Battery storage gets most of the attention, but many energy problems do not actually require electricity to be stored as electricity. If the final job is heating a building, cooling a supermarket, supplying industrial heat, or keeping a district-heating network warm, it may be simpler to store the thermal energy itself. Thermal energy storage can be as basic as a tank of hot water—or as exotic as molten salt, underground reservoirs, ice, phase-change materials, and reversible chemical reactions.
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What was the War of Currents? The fight that decided how the world would be electrified
In the 1880s, electricity had a problem: nobody had agreed what an electricity system should actually look like. Thomas Edison backed direct current. George Westinghouse built around alternating current. Nikola Tesla helped make AC dramatically more useful. The resulting War of Currents involved transformers, patents, business rivalry, public electrocutions, safety fears, and some fairly ugly propaganda. AC eventually became the backbone of the grid—but DC never actually disappeared.
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