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Tag Archives: tidal lagoons

Swansea tidal lagoon ‘should be backed’

By Dave Elliott

The review of tidal lagoons by former energy minister Charles Hendry MP called on the government to start final negotiations with Tidal Lagoon Power Ltd on a CfD strike price so that the construction of the Swansea Bay plant could go ahead. Ministers are expected to respond to the Review before the March budget and, as reported in my last post, some reservations have been expressed about the high cost. Hendry, however, seems to be very enthused. He says it could be a wise test investment, possibly opening up options for cheaper lagoons in the future.    (more…)

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Whatever next?

By Dave Elliott

Simon Taylor’s The Fall and Rise of Nuclear Power in Britain’  (UIT Cambridge) is a readable scamper through the history of the UK nuclear programme, warts and all, with much detail on who did what. The government’s Chief Scientists, Sir David King and Sir David MacKay, are seen as having played key roles in recent years, and Taylor seems to accept the resultant official view that renewables won’t be sufficient: During those inevitable dreary November days when the UK has grey skies and no wind, it will be thermal power, whether gas-fired or nuclear, which keeps the UK moving, lit and warm. Nuclear therefore has a place in the mix for the foreseeable future’. 

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UK Renewable Investment – the right priorities?

by Dave Elliott

The share of renewables in UK electricity supply reached a high of 23.5% in the third quarter of 2015 (Q3), up 5.9% from 2014 Q3, and it seems likely to continue to grow as more projects come on line. However there are some problems. UK investment in renewables reached around £14bn in 2015, but has focused increasingly on the more costly offshore wind option: £8bn was invested in it in 2015. With the government block on support for cheaper on-shore wind and its slowdown of PV solar support, that arguably imbalanced pattern will get worse. It means less capacity per £ invested. Bloomberg forecast that over the next 5 years the UK will in effect lose at least 1 GW of renewable capacity. As offshore wind moves down its cost-reduction curve, the situation may improve, if then the money saved can be spent on other projects, but Bloomberg says ‘without some form of change in policy support, we could see investment drop off a cliff after 2019′. www.independent.co.uk/news/uk/home-news/britains-renewable-energy-industry-is-about-to-fall-off-a-cliff-says-new-research-a6818186.html  (more…)

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UK energy policy – grinding to a halt?

By Dave Elliott

At a meeting of the House of Commons Liaison Committee, which brings together the chairs of select committees, PM David Cameron in effect provided an overview of his take on key aspects of UK energy policy. It was quite revealing, with justifications being offered for the extensive cut-backs in support for most low-carbon projects, in order ‘to deliver low carbon at the lowest cost’. Very little seems to have survived unscathed. (more…)

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Could tidal power be big?

By Dave Elliott

IRENA, the International Renewable Energy Agency, puts the technically available global tidal resource at near 1 TW. That is for all types of tidal system, those using vertical tidal ranges (barrages and lagoons) and those based on tidal streams, using the horizontal ebbs and flows (tidal current turbines). In practice, local limitations, access problems and other constraints will limit what may actually be achievable. So how much might be available? (more…)

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The first CfD round: wind leads

By Dave Elliott

The first full competitive auctions for renewables held under the Contracts for a Difference (CfD) regime led to £315m in contracts being awarded for over 2GW of new capacity in all, with wind projects dominating and some lower than expected strike prices emerging. (more…)

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Down on wave and tidal farms

By Dave Elliott

In my last post I looked at how solar farms were being constrained in the UK. But they are not alone. Marine renewables are also facing problems. Tragically, pioneering wave energy company Pelamis has gone into administration, after failing to secure development funding. And Siemens is to sell off Marine Current Turbines (MCT), the pioneering UK tidal company it look over in 2012, due to the slow pace of orders. Aquamarine Power, who have developed the Oyster inshore wave device, is also to “significantly downsize” its business. (more…)

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Power out: keeping the lights on

By Dave Elliott

There is still large reserve capacity, but with some large old power plants closing, like the Didcot ‘A’ coal plant, the UK has found it a bit more challenging to meet demand when there are unexpected plant outages and cold weather. So will we make it through this winter? (more…)

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Tidal energy and grid balancing

by Dave Elliott

There has been a renewed push for a Severn Tidal Barrage, but, as I have reported in earlier posts, many saw it as too big to fund and too invasive to allow. Dr Nicholas Yates from the National Oceanography Centre, who has carried out the research with a team at Liverpool University, has backed smaller barrages, which he suggested could supply 15% of UK electricity. He  told the BBC: ‘I think it’s unfortunate that attention for tidal range has tended to focus on the Severn, it’s the wrong place to start, it’s too big. Start small, it’s what the Danes did with wind – start small, learn quick and build up.’

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Tidal power – and energy storage

By Dave Elliott

Tidal energy is developing relatively slowly, but has a significant potential. Although two large tidal barrages now exists  (with 240 MW units in France and South Korea), the emphasis is on free-standing tidal current turbines, which  harvest the horizontal flow of the tides, rather than trapping tide rises behind dams, as with barrages. So the environmental impact is likely to be much less. They can also be installed relatively quickly, one by one, so reducing project finance problems. The 6th Tidal Summit, organised by TidalToday in Nov 2012, reviewed the scene, with a key issue being the need to get costs down. DECC said they has to get to down below £100/MWh by around 2025.

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