A Claverton Group Think Tank Member Discusses the Real Efficiency of a CCGT

“55% efficient CCGTs” (David Olivier)  – no such thing.  The headline efficiencies cited now are 58% but they deliberately play a marketing trick in pretending that the latent heat of vaporisation in the wettish steam within the OCGT exhaust that is finally vented to atmosphere after passing through the heat exchanger is somehow doing useful […]

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"They work and are quick to build: let the wind blow" Daily Telegraph, Thursday, July 16th – Dave Andrews is and independent energy consultant and Chair of the Claverton Group energy think tank

Daily Telegraph, Thursday, July 16th, page 5

Wind farms as is well know only work when the wind blows. This means that a turbine will on average, produce electricity on only one day out of three. However, this is not of itself an overwhelming disadvantage – as is often claimed.

Wind farms can still compete with other forms of electricity generation because although turbines are expensive to build, they have very low running costs.

The other argument against turbines is that they require back up when the wind is not blowing. This, too, is true. However, again it is not really a problem, since the power station needed to provide backup have already been built, and are cheap to keep on standby. Wind farms just make sure we use less of the fossil fuel than we would otherwise, therefore cutting emissions.

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Notes on Spanish Solar Energy Plants (CSP)

At this moment, Spain has about 150 MW of thermo electric plants
connected to the grid; some 750 MW are under construction and some 14 GW
of these types of plants have requested license and have established the
required bonds by the Spanish government. There are basically three
types of plants:

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Senior Electrical Engineer questions political risk of Czisch type supergrid

Bernard is a senior electrical engineer and has sat on many generation industry committees. He writes:

“I unfortunately missed the House of Commons presentation. I think we all agree the we could overcome technical problems at a price. However how do we overcome the political risk ? In the coal, nuclear, oil and gas areas this is dealt with by storage and multi sourcing. I don’t know how we factor in the cost of occupying a country while alternative supplies are built – even if it were possible. Any comments”

Admin writes:

Regarding political risk.

All turbines can be in EU not in dodgy foreign countries.

First of all, lets be clear, the Czisch concept / proposition is not built solely on the assumption that supplies coming from Egypt, Kazakhstan and so on as many people in this group seem to wrongly assume. The key point is that a supergrid be built linking up the EU states including Iceland and Norway. This has enormous technical and economic benefits for all power generation (but not the companies owning them – it introduces a free market which I am in full support of, but they are not), and will make the whole thing more efficient, by allowing plants to run smoothly, and lead to the obsolescing of numerous inefficient existing stations which will no longer be needed and a massive reduction in expensive spinning reserve and hot standby (- this is the key reason why there is no support form the big players – it will strand many of their assets and make it unnecessary to build a lot of the new coal plant they want to, irrespective of any renewables. Just as building the UK supergrid in 1930 made a lot of UK power stations redundant, and forced a lot of those local monopolies out of business.) However putting a lot of wind farms in far flung places is the cheapest way of getting power – but that is only one option!. If we don’t do it, and put all the turbines within EU proper, it costs a bit more, but not a lot. (Mark Barrett has already shown this

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National Grid's views on 36% wind in UK power generation mix

Dear all,   Regarding the concerns expressed in this dialogue (on the claverton mailing list – ed) regarding the intermittency of wind and the risk to the transmission network of having a large percentage of wind generation on the network.   The National Grid has in the last year established what it calls its “Gone […]

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