Electricity

Electricity powers our lives, yet most of us treat it like magic. Flip a switch, things glow. But behind that glow is a vast machine—generators, grids, and lots of geeky engineering keeping the sparks flying.

What was the War of Currents? The fight that decided how the world would be electrified

Vintage boxing-poster scene of Tesla and Edison facing off in a ring to symbolize the war of the currents between AC and DC power.

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.

What is reactive power? The electricity that does no work but somehow keeps everything working

Electric motor driving a mechanical load with glowing energy flow and blue loops illustrating reactive power supporting the motor’s magnetic field.

Some electrical power turns motors, heats ovens, lights buildings, and charges batteries. Reactive power does none of those things directly. Instead, it moves back and forth through an AC system, sustaining the electric and magnetic fields that motors and transformers need and helping keep grid voltage where it belongs. It sounds suspiciously like useless electricity. It isn’t.

What is geothermal energy? The renewable power plant hiding under your feet

Illustration of Earth resting beside a geothermal power plant with wells carrying hot and cool water through underground heat.

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.

What is a Combined-Cycle Gas Turbine? Two turbines, one flame

Illustrated Combined-Cycle Gas Turbine plant with glowing hot exhaust moving from a gas turbine through heat recovery equipment to a steam turbine producing electricity.

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.

What is wind power? How moving air becomes electricity

Witty windpower featured image showing a cartoon Sun blowing wind into a turbine that generates electricity for a nearby house.

Wind power turns the kinetic energy of moving air into electricity—but a turbine doesn’t simply “catch” wind like a sail. From uneven solar heating and atmospheric pressure differences to aerodynamic lift, spinning generators, and grid-ready electricity, here’s what actually happens inside a wind turbine.