Why do wind turbines need so much space?

Turbines create 'wind shadows' (turbulence) behind them. If you put them too close, efficiency drops by 50%. They typically need to be spaced 7 rotor diameters apart.

Can't we just put solar panels on roofs?

Yes, and we should! But rooftop solar alone can't power heavy industry or skyscrapers. We still need utility-scale farms.

Is nuclear really that small?

Yes. The Diablo Canyon nuclear plant produces 18,000 GWh/year on just 900 acres. To match that with solar, you'd need about 90,000 acres.

The Footprint of Power

Compare land use requirements for Solar vs. Wind vs. Nuclear.

📜 The Origins

Energy density is the silent hero of civilization. This tool compares how much physical space different energy sources require to generate the same amount of power.

🚀 Master the Tool

Select an energy source and a target output. We'll visualize the 'footprint' in terms of football fields or city blocks, highlighting the trade-offs of the green transition.

Energy Target

Population1,000,000 people

Equivalent to a city like a small town

Consumption (kWh/person/yr)12,000

Global avg ~3.5k, US avg ~12k. Higher consumption assumes industrial load.

Solar PV

137 km²

Moderate Density

Wind

456.6 km²

Low Density

Nuclear

1.7 km²

Ultra High Density

Relative Land Area Visualizer

137

Solar

456.6

Wind

1.7

Nuclear

Density Matters

Nuclear power is so dense that to power a city of 1,000,000, you'd need 1.7 km², compared to 456.6 km² for wind!

The Hidden Cost of "Clean" Energy

When we talk about green energy, we usually talk about carbon. But we rarely talk about Land Density. To power a city like New York, you need raw space—and not all energy sources use space equally.

The Density Hierarchy

This calculator visualizes the "Power Density" (Watts per square meter) of various sources: 1. Nuclear: The champion of density. One plant (approx 1 sq mile) produces the same power as 360 square miles of wind turbines. 2. Natural Gas/Coal: High density, but high pollution. 3. Solar: Moderate density. Requires ~5 acres per Megawatt. 4. Wind: Low density. Requires huge spacing between turbines to prevent wake turbulence, though farming can happen underneath.

The "NIMBY" Problem

Everyone wants renewable energy, but "Not In My Backyard." To go 100% solar, the US would need to pave an area roughly the size of West Virginia with panels. Understanding this footprint is key to realistic urban planning.