"Tidal power utilises the twice daily variation in sea level caused primarily by the gravitational effect of the
Moon and, to a lesser extent the Sun on the world's oceans. The Earth's rotation is also a factor in the production
of tides. Tidal power is not a new concept and has been used since at least the 11th Century in Britain and France
for the milling of grains."
Click any illustration for information
Ebb Generating System
ResLab - Research Institute for Sustainable Energy
Murdoch University, South St, Murdoch, Western Australia
PDF Link - A Comprehensive Review of Tidal Power Systems
Web Link - ResLab - Research Institute for Sustainable Energy
Wave Energy Collection
European Marine Energy Centre in Orkney, Scotland
A company called Ocean Power Delivery is developing a method of offshore wave energy collection,
using a floating tube called "Pelamis". This long, hinged tube (about the size of 5 railway carriages)
bobs up and down in the waves, as the hinges bend they pump hydraulic fluid which drives generators.
Pelamis has a similar output to a modern wind turbine. The first full-scale pre-production prototype has
been built and is being tested at the European Marine Energy Centre in Orkney, Scotland.
It is anticipated that future "wave farm" projects would consist of an arrangement of interlinked
multi-machines connected to shore by a single subsea cable. A typical 30MW installation would occupy
a square kilometre of ocean and provide sufficient electricity for 20,000 homes. Twenty of these farms
could power a city such as Edinburgh.
An Introduction to Wave Power
Web Link - Introduction to Wave Power
Pelamis: Ocean Power Deliver Limited
Web Link - Pelamis
Web Link - Ocean Power Deliver Limited
Floating Power Station
Britain is helping to fund the development of the world's first floating power station.
Energy minister Brian Wilson has committed 1.67 million pounds of government funds to a 2.7 million
pound project which he said will help Britain achieve its target of cutting greenhouse
gas emissions, blamed by many scientists for global warming.
"Wave power has a huge part to play in our drive for renewable power. Our oceans are a major potential
energy source and can lead to a new industry for the UK in which I am determined that we should be world
leaders" said Wilson in a statement.
The new off-shore generator from Inverness-based green power company Wavegen will supply enough
electricity for 1,400 homes after it is launched next summer from a new marine energy testing centre
to be built in Orkney, Scotland. The company built another station in Islay, Scotland (see picture).
Britain's first commercial wave generator, Osprey (Ocean Swell Powered Renewable Energy) was destroyed
by a summer storm in 1995.
Web Link - get Full Story
Web Link - get Company Info
Limpet - Land Installed Marine Powered Energy Transformer
Limpet uses the principle of an oscillating water column. The diagrams show how
In Scotland, around 12% of electricity comes from renewable sources. This has to
rise to 18% by 2010 to
meet a target that's been set by the Scottish Executive, whilst the aspiration
is to generate 40% from
renewable sources by 2020.
"Limpet (Land Installed Marine Powered Energy Transformer) is a shoreline ebergy converter sited
on the island of Islay, off Scotland's west coast. The current Limpet device - Limpet 500 - was
installed in 2000 and produces power for the national grid.
"The turbines are carefully matched to the air chamber to maximise power output.
The performance has been optimised for annual average wave intensities of between 15 and 25kW/m.
The water column feeds a pair of counter-rotating turbines, each of which drives a 250kW generator,
giving a nameplate rating of 500kW."
"The Faroese power station is based on the oscillating water column technology successfully
developed by Wavegen at its Islay plant. The key innovative feature is the use of tunnels cut into
the cliffs on the shoreline to form the chamber which captures the energy."