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Tag Archives: PV solar

The green power switch – all to solar

By Dave Elliott 

A new book ‘The Switch’ (Profile Books) by Chris Goodall suggests that the combination of cheap solar photovoltaics and cheap batteries will be a global winner. It is certainly true that the cost of PV solar has been falling rapidly, outstripping predictions, and even confounding most of the PV optimists, as the technology has improved and markets for it have built. Goodall sees this as a continuing process, at maybe up to a 40% annual growth rate, with PV soon becoming the dominant energy source globally, a view that he notes even some conservative oil companies now share. Lithium ion battery costs have also fallen significantly. So, with wind also providing inputs when there is no sun, we are all set!  A similar line was taken in Tony Seba’s book ‘Clean Disruption of Energy and Transportation’. PV and batteries are going to boom worldwide, and electric vehicles too.

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Solar PV and energy storage

By Dave Elliott

Some say that the vision of households and businesses moving largely off-grid by storing solar power generated during the day for use overnight is close to becoming a reality. The prospects for moving entirely off grid may be limited – most projects will still need grid links to allow for top-ups when solar input is low for long periods and the stores are exhausted. However, that still leaves a significant potential for self-generation and storage.                                                                                        (more…)

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Energy in the US: the rise of renewables

By Dave Elliott

Energy use and impacts are changing in the USA, in part due to progressive policies from Obama, but also because of structural changes in the energy economy. Carbon dioxide emissions from US energy sector have fallen 12% since 2005, mainly since there has been a decline in the use of coal, although its fall back has mostly due to an increase in the use of natural gas to generate electricity. However, renewables are also playing growing roles, supplying around 16% of US power, eclipsing nuclear (their output overtook that from nuclear in 2010) and they are expanding fast, hitting 17% in the first part of 2016. But all that could change when Trump takes power. (more…)

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Japan – pressure for more renewables mounts

by Dave Elliott

Japan’s use of both fossil fuels and renewables has increased since the 2011 Fukushima nuclear disaster but, with energy costs being high, improved energy efficiency and massive energy saving drives have pushed national power consumption in 2015 down 12% below the 2010 level. There have been attempts to get approval to restart some the 43 surviving reactors, but so far only 3 have restarted fully – 2 more did, but then closed following court orders. With renewables, including hydro, supplying 14.3% of power in Japan in the year to March 2016, they are producing much more output than nuclear – 139TWh versus 4.3TWh in 2015. Rapid expansion is planned, but even more is being called for.  Meanwhile, the slow and expensive process of cleaning up Fukushima rumbles on, with worries still emerging about leaks and contamination.

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EU Renewables round up

By Dave Elliott

Renewables are roaring ahead in Europe, with wind at over 140GW and PV surpassing 100GW. There have been some spectacular successes, with renewables briefly supplying 87% of German electricity at one point, and Portugal achieving similarly high contributions-something that’s a regular occurrence in Denmark. But progress may soon be slowed as  economic pressures mount and political reaction sets in with support schemes being withdrawn or constrained. For example, in Germany it’s all change as the government revises the Energiewende energy law with a slow down for wind and solar expansion, via annual capacity caps and reduced support levels. Portugal has also started to phase out its support for renewables, although not quite so aggressively as happened in Spain, or, for that matter, the UK. (more…)

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Cities and renewable energy

By Dave Elliott 

Urban areas account for around 75% of the world’s energy use and there are ambitious plans to reduce their reliance on fossil fuels. Around the world, cities are beginning to think in terms of meeting their energy needs from renewable sources, so as to limit air pollution and climate change problems.  The case for this transition is strong, not least given the likely rise in air-conditioning demand as climate change impacts more,  and there have been many interesting initiatives launched around the world, often led by city governments.  (more…)

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Renewables continue to boom globally

By Dave Elliott

BP says renewables have shown ‘a quicker pace of penetration than any other fuel source in modern history’, and their strong growth meant that they ‘accounted for all of the increase in global power generation in 2015’. BP’s latest review of world energy trends carbon notes that wind power capacity grew by 17.4% and solar by 32.6% last year, with China overtaking Germany and the US as the largest solar generator: www.bp.com/en/global/corporate/energy-economics/statistical-review-of-world-energy.html  REN21 has come up with equally high figures. And looking to the future, both see renewables booming, as does Bloomberg.

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PV solar: big isn’t always better

By Dave Elliott

PV solar is now big – with 227GW installed around the world. But large solar farms apart,  much of it is in small roof-top units. Would bigger arrays be better? Certainly economies of scale suggest large-scale projects are generally more cost-effective than small ones. That holds up well for wind, but does it also hold for PV solar?

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All Energy: an ecumenical approach

By Dave Elliott

The All Energy Conference in Scotland, despite its title, usually focuses on renewables but, some feel provocatively, it has of late also included sessions on nuclear. A petition was raised against this, with over 1,700 signatories, but an ecumenical approach does have its attractions – we get to hear from all the contenders and can form an impression of the overall state of play. Better surely than a partisan ‘no platform’ stance?

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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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