The Siadar Wave Power Station (also known as Siadar Wave Energy Project or SWEP) was a proposed 4 MW wave farm 400 metres (1,300 ft) off the shore of Siadar Bay, in Lewis, Scotland.

[1] The £30 million project, was to be built by Wavegen, received Scottish Government approval on 22 January 2009.

Originally, the project was developed in cooperation with npower Renewables.

[3] The wave station was proposed to be based on oscillating water column technology.

[4] A 200-metre (660 ft) causeway will be constructed, and a breakwater with 10 concrete caissons, containing 36 to 40 Wells turbines, placed on the seabed.