Tidal Renewable Energy is a niche form of Alternative Energy with less than 500 MW of Electricity Capacity worldwide.Tidal Renewable Energy generates less than .001% of the worldwide electricity generation as the Technology of this Alternative Energy is still quite immature.Tidal Renewable Energy is still an immature technology with most of the plants built around the world being pilot/demonstration ones.The older ones based on Tidal Barrages are also very few in number with the Tidal Power Plant in Le Rance in France the only major operating Tidal Power Plant in the World.Tidal Barrages however are facing major headwinds due to high capital costs and long gestation periods.The newer Tidal Renewable Energy Technologies like Pelamis and Seagen hold big potential though still a decade away from reaching large commercial scale just like Algae based Biofuel and other forms of Green Technology.
Tidal Wave Energy is still in its baby phase with the technology not developed far enough to make it a real alternative to fossil fuel energy.However like solar and wind power 20-30 years ago,Tidal Wave Energy can still develop to become a major form of alternative energy.