Tidal Energy: The Untapped Renewable Resource That Could Power Millions of Homes

Tidal energy harnesses the predictable movement of ocean tides to generate electricity. Unlike solar and wind, tides are 100% predictable centuries in advance. Current tidal capacity is small (~500 MW globally) but growing rapidly. Key projects: MeyGen (Scotland, 6MW operational, expanding to 392MW), Sihwa Lake (South Korea, 254MW - world's largest), and Raz Blanchard (France, developing 2GW). Tidal stream generators (underwater turbines) and tidal range systems (barrages and lagoons) are the two main approaches. Economics are improving: tidal energy costs fell from $0.40/kWh to $0.15/kWh. Challenges include environmental impact on marine ecosystems, high capital costs, and limited suitable locations. The potential is enormous: global tidal energy could provide 1000+ TWh annually.