Solar power has become one of the cheapest and fastest-growing sources of electricity on Earth. But how does a panel on a roof actually turn sunshine into usable energy?
The Photovoltaic Effect
Solar panels are made of photovoltaic (PV) cells, usually silicon. When sunlight hits a cell, it knocks electrons loose, and the cell’s design forces those electrons to flow in one direction — creating a direct electric current (DC).
From Panel to Plug
The DC electricity then passes through an inverter, which converts it into the alternating current (AC) used by homes and the grid. Surplus power can be stored in batteries or fed back into the grid for credit.
Why It’s Booming
The cost of solar panels has fallen dramatically over the past decade, making solar competitive with — and often cheaper than — fossil fuels. It produces no emissions while operating and can scale from a single rooftop to vast utility farms.
The Challenges
Solar only generates power when the sun shines, so storage and grid management are key to making it reliable around the clock. Advances in battery technology are steadily closing that gap.
