Shane is correct,, in general wave-power doesn't seem to survive for long. Tial power however is a possible.Rance is one of the very few tidal power plants, 60 years old and still working.
Rance Tidal Power Station - Wikipedia
en.wikipedia.org
In spite of the high development cost of the project, the costs have now been recovered, and electricity production costs are lower than that of nuclear power generation (1.8 ¢/kWh versus 2.5 ¢/kWh for nuclear). However, the capacity factor of the plant is 28%, lower than 85–90% for nuclear power.