Editing South Stack (section)

===Tidal energy project===
In 2019, proposals to develop a {{convert|35|km2|mi2|abbr=on}} 'West Anglesey Demonstration Zone' tidal energy project at South Stack were submitted under the [[Transport and Works Act 1992]] to the [[Welsh Government]] for planning consent.<ref>{{cite web |url=http://www.morlaisenergy.com |title=What is Morlais |publisher=[[Menter Môn]] |access-date=26 October 2019}}</ref> Consent for the project, called [[Morlais]] was awarded in December 2021 and construction of the onshore grid connection works took place in 2023.<ref>{{Cite web |date=23 June 2023 |title=Jones Bros completes onshore works for Morlais |url=https://renews.biz/86507/jones-bros-completes-onshore-works-for-morlais/ |website=reNEWS.biz}}</ref><ref>{{Cite web |date=20 October 2023 |title=Official opening of Wales' first tidal stream energy site on Anglesey |url=https://www.northwaleschronicle.co.uk/news/23870226.wales-first-tidal-stream-energy-site-opens-anglesey/ |access-date=1 December 2023 |website=North Wales Chronicle |language=en}}</ref>

As the development will come within {{convert|500|metres}} of the South Stack [[SSSI]], concerns have been expressed about the visual impact on the Anglesey [[Area of Outstanding Natural Beauty]] and the Holyhead Mountain [[Heritage Coast]], along with the resultant impact on the tourism, recreation and fishing sectors. The developers have identified that seabird and mammal populations would be affected within the Holy Island Coast [[Special Area of Conservation]] and [[Special Protection Area]] along with the North Anglesey Marine Special Area of Conservation. Most notably [[bottlenose dolphin]] and [[harbour porpoise]] would likely be affected, whilst [[razorbill]] and [[common guillemot]] will be severely impacted. The [[RSPB]] is concerned that the razorbill colony on South Stack could be wiped out.<ref>{{cite web |url=https://community.rspb.org.uk/placestovisit/southstackcliffs/b/southstackcliffs-blog/posts/update-on-morlais |title=Update on Morlais |website=rspb.org.uk |date=15 April 2020}}</ref>