Category Archives: Renew your energy

The limits of PV solar

By Dave Elliott

Solar PV has been talked up a lot of late. Its costs have certainly fallen and it has expanded to reach around 300GW capacity globally so far. But is it really going to be the dominant renewable as some have suggested? For example, a recent report from the Grantham Institute/Carbon Tracker has PV supplying 29% of world power by 2050 (PDF), with a massive 10,000GW or so in place. Is that realistic?

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Election promises on energy

By Dave Elliott

In the UK general election run up, with consumer power costs rising provocatively, there had been talk of a cap on energy prices and, in its election manifesto, although specifics were absent, the Conservative party certainly focused on economics. It said Our ambition is that the UK should have the lowest energy costs in Europe, both for households and businesses’ and it would aim for ‘competitive and affordable energy costs following a new independent review into the cost of energy’. (more…)

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In praise of auctions

By Dave Elliott

IRENA, the International Renewable Energy Agency, seems to have been won over to competitive price-based project auctions as a way to stimulate rapid take up of renewables.  It says ‘the main strengths of auctions relate to flexibility, price and commitments. The flexibility of design allows policy makers to combine and tailor different elements to meet deployment and development objectives, while taking various factors into account, such as the country’s economic situation, the structure of its energy sector, and the maturity of its power market’. That’s a bit of a shift: in the past much attention has been paid to guaranteed price Feed in Tariffs (FiTs). (more…)

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100% Renewables? Mostly nonsense!

by Dave Elliott

So says a new study by a group of mostly pro-nuclear academics, who look critically at some of the many ‘100% renewables’ global or regional energy scenarios that have emerged in recent years. 24 were deemed to have forecast regional, national or global energy requirements in sufficient detail to be considered potentially credible but, on inspection, none were considered to have provided convincing evidence that basic feasibility criteria, in relation to energy supply reliability, grids and balancing, could be met. (more…)

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Renewables – now 70% by 2050 is the low estimate!

by Dave Elliott

In a joint report, the International Energy Agency and the International Renewable Agency present their views on how to comply with the Paris COP 21 Climate protection aims. The pathways that they describe both have renewables expanding rapidly, but differ in pace and level. As might be expected, IRENA sees renewables as being able to deliver significantly more power by 2050 than the IEA – 82% of global electricity by 2050, compared to the IEA’s estimate of ‘near 70%’. However, it is striking that, whereas previously, renewables had often been seen as perhaps able to deliver 50% by 2050, we have now moved on to debating whether 70% is too low. With costs falling, the supposed limits are being pushed back continually… (more…)

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Emission Reduction Plan

By Dave Elliott

Between 1990 and 2015, UK greenhouse gas emissions fell by 38% and should fall by 48% by 2020 on current policies, within the framework of carbon budgets established by the Climate Change Act. Looking further ahead, the UK has committed to a 5th carbon budget (for 2028-32) which requires greenhouse gas emissions to be reduced by 57% by 2030 (against 1990 levels), on the way to at least 80% by 2050. But there is still a way to go.

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Nuclear Power: Past, present and future

By Dave Elliott

I have been looking at some early, novel, nuclear ideas and how some of them are being re-explored. Thorium, molten salt reactors, high temperature reactors, fast neutron reactors- they have all been tried earlier on, with mixed results. In a new book for IOPP I ask, will the revamped variants, including smaller versions, do any better? And more radically, do we actually need any of them- has nuclear really got a future?

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Nuclear is cheap says Lloyd’s Register

By Dave Elliott

Nuclear power generation technologies are now cost competitive in some contexts and innovation is gathering pace across the sector, British consultancy Lloyd’s Register says in a report Technology Radar – a Nuclear Perspective. A parallel, wider Technology Radar – Low Carbon report, reviews renewables, energy storage and infrastructure, as well as nuclear. That is quite positive about solar power and storage, but it also presents nuclear as a possible winner.    (more…)

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The last word on the cost of balancing renewables

By Dave Elliott

The UK Energy Research Centre (UKERC) has produced an update to its 2006 report that had looked at the costs and impacts of using ‘intermittent’ electricity from renewables such as wind and solar. The 2006 study had only examined impacts with up to a 20% input, but the UKERC researchers now say that, even at the higher levels we are now expecting, it was still the case that the costs of balancing renewables could be low. However, they warned that, unless ‘urgent’ action was taken by the government to boost grid flexibility, the costs of adding renewables in future will be ‘much higher than they need to be’.

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Nuclear or renewables – two new scenarios

By Dave Elliott

Guest posts by Energy Matters’ commentators Alex Terrell and Andy Dawson present two rival UK scenarios for 2050 with, respectively, high nuclear and high renewables. It’s an interesting exercise. They looked at DECC’s 2050 Pathways models, but say ‘it’s far from clear if the underlying models take adequate account of variations in demand’. So they developed their own demand projections.

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