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Section highlightHouses into homes This report details findings to emerge from the evaluation during the first six months of delivery (April to September 2012).
Written Statement - The Draft Control of Dogs (Wales) Bill »We are committed to ensuring that out-of-control and dangerous dogs are dealt with effectively.Learn more »
Minister tells NHS managers: "Listen to your staff and take action"
Health Minister Mark Drakeford has given a clear message to NHS managers to take action in response to the recent NHS Wales staff survey
- Minister supports International Day Against Homophobia and Transphobia
- Porth Eirias set to be major North Wales attraction
- Minister tells NHS managers: "Listen to your staff and take action"
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Section highlightAccess to information
The Welsh Government has followed the principles of openness in government for many years. Find out how you can make a freedom of information request or see requests that have already been made.
National minimum standards for regulated child care »These standards determine whether child minding and day care settings are providing adequate care for children under the age of 8.Learn more »
- Continuity and Change - Refreshing the Relationship between Welsh Government and the Third Sector in Wales
- Repealing air quality ‘Further Assessments’ from Part IV of the Environment Act 1995
- Equality Impact Assessment of the 2014-2020 Rural Development Plan for Wales
- Consultation on the Equality Impact Assessments for the 2014-2020 Structural Funds Programmes in Wales
- Development of a national standards and outcomes framework for Children and Young People's advocacy services in Wales
- Strategic Environmental Assessment: Environmental Report, Rural Development Plan for Wales 2014-2020
Featured consultation »Implementing the Domestic Fire Safety (Wales) Measure 2011
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Section highlightFurther and Higher Education (Governance and Information) (Wales) Bill 2013
Removes a number of technical restrictions and controls on colleges without changing the principal powers of colleges to provide further, higher and secondary education.
Legislative programme 2012 - 2013 »
Addressing the Assembly in the Senedd today, the First Minister, Carwyn Jones, detailed the eight bills in the Welsh Government’s 5-year Legislative Programme that will be brought forward during the second year of the Welsh Assembly.Learn more »
Section highlightCommunity Infrastructure Levy
Local authorities can charge a Community Infrastructure Levy on new developments to support the infrastructure needed.
2nd Supplementary Budget 2012-13 »
Proposes a number of changes to the 1st Supplementary Budget for 2012-13, which was published on 26 June 2012.Learn more »
There are two types of tidal power technology – tidal range and tidal stream.
Tidal range makes use of the height difference between high and low tides and generates electricity by creating a difference in the height of the water either side of a structure. It then passes the water through turbines like a hydroelectric dam.
Tidal stream is still in the very early stages of commercial deployment. It makes use of the movement of the water from the naturally occurring tidal currents (imagine an underwater wind turbine).
The difference between high and low tides in the Severn Estuary can be as much as 14 metres, or 45 feet. Due to this the feasibility study is focusing on tidal range technology as this is where the main opportunity for Severn tidal power lies. However, some tidal stream technologies are being assessed as part of the Severn Embryonic Technologies Scheme (SETS).
The five schemes that the study is conducting a high level impact analysis on, includes two tidal range technologies – barrages and lagoons. The embryonic schemes that are being supported through the Severn Embryonic Technologies Scheme (SETS) include one tidal range technology (the low-head barrage) and two tidal stream technologies (two different tidal fences).
Barrages and lagoons are based on the proven technology used in hydroelectric dams. Tidal stream technology is still in the early stages of development. The turbines proposed for the low-head barrage are a new type of turbine which have not yet been developed at scale.
Brief explanation of each type of technology
Barrages work by building a wall across an estuary and effectively converting the wall into a hydroelectric dam. The water from the incoming tide is allowed to pass through sluices in the barrage, but is held behind the barrage as the tide goes out. When the water level on the seaward side is low enough, the water behind the barrage is released through a series of turbines, generating electricity.
Lagoons work on the same principle but capture areas of water rather than having a barrier across the estuary. Lagoons can be completely offshore, or a semi-circle with both ends connected to the land.
- The low head barrage (proposed by RollsRoyce – Atkins) is similar in structure to a conventional barrage but with a new type of turbine (not yet developed at scale). The turbine is likely to draw upon technologies from both tidal stream and tidal ranage technologies. The turbine design would generate electricity on both the incoming and outgoing tides and operate at a lower depth and water level difference than conventional barrage turbines.
- The tidal fence (proposed by the Severn tidal power fence consortium) works by installing around 500 – 800 tidal stream turbine in a line across the Estuary. The fence could be located between Brean Down and Lavernock Point (the same place as the Cardiff-Weston barrage) or between Minehead and Aberthaw. The study will look at tidal stream turbines currently under development as single devices at around MegaWatt (MW) scale and assess their feasibility to be scaled up and incorporated as several hundred devices in a fence.
- The tidal fence (as proposed by VerdErg) is a radical new fence design and works in a completely different way to the other fence option. It still makes use of the tidal stream, but a large proportion of the tidal flow passes through a fence structure formed of vertical and horizontal tubes. When water passes between the vertical tubes a pressure difference is created and this causes water to flow at high speeding the horizontal connecting tubes. This then drives turbines to generate electricity on both incoming and outgoing tides.