Tidal Energy
Tidal power is another option that has potential for utilizing the waterways in addition to offshore wind. The tides have a potential energy output of around one terawatt. One terawatt corresponds to a significant portion of the 17 terawatts that the entire world consumes annually.
Europe has seen attempts at a number of wave farms, including ones in Portugal, France, and other countries. Although they have demonstrated the concept, they have not yet demonstrated long-term viability. Past initiatives have been ruined by difficulties maintaining functional turbines. By no means a lot, but it demonstrates that there is promise. Local power networks in coastal areas may be able to benefit from the technology if it can be scaled up effectively.