The Pembrokeshire coast has a significant wave and tidal stream climate. A study of the marine resource in Pembrokeshire was performed in 2006 by PMSS. They concluded Pembrokeshire had the highest concentration of wave resource in Wales equating to an indicative capacity of up to 5600MW providing a significant opportunity for development of the industry. Tidal streams around the west of Ramsey Island and within Ramsey Sound can reach up to 4ms-1. RPS consultants carried out the Marine Renewable Energy Strategic Framework for Wales, a £1 million project mapping resource and potential constraints. The study confirmed that there is potential for 6.4GW of installed marine energy capacity in Wales.
The Crown Estate’s UK Wave and Tidal Key Resource Areas Project (2012) highlighted Pembrokeshire as having significant tidal stream and wave resources.