Wave energy has the theoretical capacity to power cities, with global wave power potential estimated at 29,500 TWh annually—enough to supply roughly 150% of current worldwide electricity consumption. However, practical deployment remains limited to pilot projects and small-scale installations, with total global installed capacity under 30 MW as of 2024.

How Much Energy Can Wave Power Actually Generate?

Individual wave energy converters typically produce 0.5-2 MW each. Scotland’s Orkney Islands hosts Europe’s most advanced wave energy test site, where devices have generated up to 3 MW during peak operation. Portugal’s Aguçadoura Wave Farm briefly achieved 2.25 MW before technical failures forced closure in 2008. Current costs range from $0.30-0.50 per kWh—five times higher than offshore wind.

What Cities Are Currently Using Wave Energy?

No major city relies on wave energy for grid power. The closest example is Orkney, Scotland, where the European Marine Energy Centre supplies small amounts to approximately 500 homes. Perth, Australia operates a demonstration project generating 0.24 MW. Most installations remain experimental rather than commercially viable.

What Are the Main Barriers to Powering Cities?

Harsh ocean conditions destroy equipment rapidly—the average wave device operates 40% less than designed capacity. Installation costs exceed $10 million per MW. Transmission infrastructure from offshore sites to urban centers adds billions. Until costs drop 70-80% and reliability improves dramatically, wave energy cannot power cities at scale.