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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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Renewable Energy: GB manages a day without coal

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31 to 38 of 38

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    • CommentAuthorgoodevans
    • CommentTimeApr 24th 2017
     
    The graph (and numbers from that site) don't seem to treat power generated by solar as demand - where there is solar generated I expected to see the ccgt line diverge (dip) when compared to the demand line - but either all solar is thrown way, or it's not counted in the demand number (this is what I think has happened - on dull days the demand line does not have a big dip either side of noon).
    • CommentAuthorskyewright
    • CommentTimeApr 24th 2017
     
    Posted By: goodevansThe graph (and numbers from that site) don't seem to treat power generated by solar as demand - where there is solar generated I expected to see the ccgt line diverge (dip) when compared to the demand line - but either all solar is thrown way, or it's not counted in the demand number (this is what I think has happened - on dull days the demand line does not have a big dip either side of noon).

    Could that be at least partly due to Domestic solar, which from the point of view of something looking at the real time big picture is 'unmetered'?
    • CommentAuthorgoodevans
    • CommentTimeApr 24th 2017
     
    Its possible - but its all solar - not just domestic solar. - I suspect its just a clerical error - a true demand curve should be the existing one plus the solar contribution.
    • CommentAuthorEd Davies
    • CommentTimeApr 24th 2017 edited
     
    AFAIK all solar is “unmetered” (i.e., meter readings aren't reported in real time to the grid operators). It's also true of all but the largest wind farms, even sites with tens of MW of generation are often “embedded” (i.e., connected to the local distribution network, not the grid proper) and don't report in real time. Where sites like these show this embedded generation as anything other than a reduction in demand it's done as an estimate from weather conditions and the real-time reported data of the farms which do that.
    • CommentAuthorgoodevans
    • CommentTimeApr 24th 2017
     
    fair enough - but I think the site should report demand with solar estimate included (or not report the solar estimate at all) so that demand = total generation. It's a small point - not worth worrying about any further.
    •  
      CommentAuthorfostertom
    • CommentTimeApr 24th 2017
     
    Posted By: fostertomthin films coming to market soon
    but then it comes to this
    http://theconversation.com/deep-sea-mining-could-help-develop-mass-solar-energy-is-it-worth-the-risk-76500
    • CommentAuthorTimSmall
    • CommentTimeJun 6th 2017 edited
     
    Hopefully perovskite panels (or rather silicon-perovskite tandem cells >25% efficient) will come to market. Similar advantages to CdTe thin films, but without exotic rare mineral requirements. Stability longevity still not there for perovskites, but making fast progress by the look of it.

    https://youtu.be/lAaLlyx0i9E?t=34m38s

    CdTe and Perovskites are the two sets of yellow dots here (both are now at the same efficiency for single junction third-party-verified research cells (22.1%) but after only about 5 years of development for perovskites vs. 40 years for CdTe):

    https://commons.wikimedia.org/wiki/File:Best_Research-Cell_Efficiencies.png
    • CommentAuthorTimSmall
    • CommentTimeJun 6th 2017 edited
     
    Posted By: goodevans "The graph (and numbers from that site) don't seem to treat power generated by solar as demand"

    'True Demand' with estimated solar PV output included is available here:

    https://www.solar.sheffield.ac.uk/pvlive/

    incidentally (due to the windy weather) at one point we were down to less than 20% of UK power coming from domestic fossil fuels last night - 1.1% coal and 18% combined cycle gas at 4am GMT - with Damon's site showing a minimum generation CO2 intensity of 125g CO2 per kWh... http://www.earth.org.uk/_gridCarbonIntensityGB.html

    Total of about 4 GW fossil generation, and there's another 1.5 GW or so of wind due to come on line in the next couple of years - I don't know what sort of curtailment did or would happen under similar circumstances tho'.

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