In this episode we discuss those other two "offshore" energy sources: wave and tidal energy. A few years ago there seemed to be much excitement about their prospects, but despite various technical trials and innovations, few actual projects have materialised. Why is that and how might things change? 

It's fair to say that we arrive at a fairly downbeat view of both wave and tidal, albeit with some ideas of niches they could exploit. However, new proposals for marine energy projects do continue to appear, so we always reserve the right to be wrong!