There is clearly a tremendous amount of energy in the oceans, and harnessing it for our energy system would be ideal. But how? Along the coastline of Europe, you can see that this question has long inspired innovation, with a host of ideas born and tested to make use of waves and tides. The Joint Research Centre of the European Commission has been watching the sector for years, and its analysis shows the parts of the EU in which developers are active, and in which the ocean energy supply chain is developing. Most of the activity, predictably, takes place in coastal areas, but there are inland regions which are also engaged.