Wave energy cannot yet power entire cities at scale. Current installations generate 0.5-2 MW per unit—enough for 500-1,500 homes—while major cities need 1,000+ MW. The technology remains experimental with costs at $0.50-0.70 per kWh, far above grid electricity at $0.10-0.15 per kWh.

How Much Energy Can Wave Power Actually Generate?

The world’s largest operational wave energy project, the Mutriku Wave Energy Plant in Spain, produces just 0.3 MW from 16 turbines. Scotland’s Orbital O2 tidal turbine generates 2 MW—powering roughly 2,000 homes. By comparison, a single offshore wind turbine produces 8-12 MW. Wave energy density is impressive at 2-3 kW per meter of coastline, but converting this into electricity remains inefficient at 25-40% capture rates.

Which Cities Could Realistically Use Wave Energy?

Small coastal towns like Orkney, Scotland (population 22,000) already supplement grids with wave power. Portugal’s Aguçadoura project briefly powered 15,000 homes before equipment failures. Cities like San Francisco (874,000 residents) would need 1,200+ MW—requiring 600-2,400 wave devices. The infrastructure doesn’t exist yet.

What Are the Current Limitations Blocking City-Scale Deployment?

Harsh ocean conditions destroy equipment within 2-5 years. Maintenance costs run 3-4x higher than offshore wind. Transmission cables to shore add $1-2 million per kilometer. Only 12 commercial-scale projects operate globally in 2024, with total capacity under 15 MW—less than two wind turbines.