Ocean wave and tidal energy are possible sources of renewable energy that are still in development. 

In a scenario with high renewable energy demand, we expect most of that capacity to be coming from wind and solar, rather than wave or tidal energy. If you want to test the possibility that there is a major breakthrough in wave and/or tidal energy technology that would enable it to significantly overcome the existing barriers and scale up quickly, then you would want to use the New Technology slider to model it.