Archive for intermittency

Managing Variability – A report to WWF-UK, RSPB, Greenpeace UK and Friends of the Earth EWNI

SUMMARY

In order to comply with legislation from the European Union, the UK’s renewable energy target (to produce 15% of final energy consumption from renewable sources by 2020) may require between 35 and 40% of our electricity to come from renewable energy sources by 2020. After 2020, a higher proportion may be needed. A significant amount of this renewable electricity is likely to come from wind, and the variability of this power needs to be managed. Although aspects of the management of wind variability can be controversial, utilities the world over generally agree that there is no fundamental technical reason why high proportions of wind energy cannot be assimilated into the system. There is a large body of literature on the topic and the steady growth of wind power, worldwide, indicates that it is seen as a robust choice for reducing   greenhouse gas emissions. Read More→

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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 Green” scenario, which is its vision for the energy mix required for 2020 in order to meet the UK’s renewables targets.  The key headlines of this scenario are: Read More→

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Dear P

I made a mistake,….. it was EDF and E.ON who made the submission. Not E.ON and National Power (who are now owned by RWE).

Effectively they are saying exactly what was pointed out in the “Briefing Note” that was published in the Inst of Civils Energy Journal two years ago. I attach a MODIFIED copy of this.

http://www.claverton-energy.com/download/325/

The article about EDF and E.ON was by Terry Macalister (see guardian.co.uk, Monday 16 March 2009)

“EDF and E.ON have warned the government they may be forced to drop plans to build a new generation of nuclear power plants unless the government scales back its targets for wind power.

The demands – contained in submissions to the government’s renewable energy consultation – reinforces the worries of wind developers that the two sectors cannot thrive simultaneously.

EDF of France and E.ON of Germany, two of the most high-profile nuclear supporters, said attempts to reach 35% of electricity generated by renewables is not only unrealistic but also damaging to alternative schemes such as nuclear plants.

“The deployment of high levels of intermittent renewables for electricity generation will require the construction of additional carbon-emitting plant as back-up for when renewables are not available to meet demand,” EDF argued. “This is likely to be predominantly gas-fired and will therefore undermine efforts to reduce dependence on non-domestic fuel sources.”

“A 25% electricity target will provide the best platform for further decarbonisation of electricity generation in the period beyond 2020, through a combination of further renewables, new nuclear and coal and gas with carbon capture and storage.”

The attempt to dilute the contribution from renewables has infuriated the environmental lobby. “We’ve always said that nuclear power will undermine renewable energy and will damage the UK’s efforts to tackle climate change – now EDF agrees,” said Nathan Argent, head of Greenpeace’s energy solutions unit.

“The National Grid shows that there is capacity to take well over 30% percent of our electricity from renewables. EDF are trying to block efforts to deliver on the most important technology to the UK to tackle climate change and keeps the light on in order to protect their own vested nuclear interests.”

Friends of the Earth agreed. “The UK is the windiest country in Europe with the best wave and tidal resources,” said Andy Atkins, the group’s executive director. “We should be maximising renewables and harnessing as much of that clean, safe energy as we possibly can – not propping up the French nuclear industry.

“Nuclear power is no green alternative – it leaves a legacy of deadly radioactive waste that remains dangerous for tens of thousands of years. And nuclear power plants simply cannot be built in time to deliver the cuts in carbon dioxide emissions that science says are needed.”

E.ON said it was wrong to interpret the submission as an attempt to dismiss wind power completely.

A spokesman said the company had already built a raft of wind farms in Britain and had plans for more. “We believe in a mix of power sources, including nuclear and renewables, but we know that during the cold spell in January that some of wind farms were operating at less than 10% of capacity.”

Best regards

F

note – see also: http://www.claverton-energy.com/download/323/

Popularity: 7% [?]

Wind Power and Reliability: The Roles of Baseload and Variable Resources
Federal Energy Regulatory Commission (FERC) Chairman Jon Wellinghoff has stated that “baseload capacity is going to become an anachronism” and that no new nuclear or coal plants may ever be needed in the United States.

Quote from Press Release:

“1.  This fact sheet explains why baseload power is only one of many ways to meet the power system’s need for energy and capacity, particularly in a world where a variety of other resources can provide these commodities at competitive prices. In addition, this fact sheet illustrates that, because baseload power has little or no flexibility, baseload power alone is insufficient to meet all power system needs. A combination of a large amount of renewable energy, combined with flexible natural gas plants and demand-response and efficiency, can ensure that our electric system has sufficient energy, capacity, and flexibility, and operates reliably and cost-effectively. The marketplace is already pointing in the direction described by Chairman Wellinghoff: since 2005, natural gas and wind power have accounted for nearly 90% of all new U.S. generating capacity……”

Continued at:  US FERC John Wellinghoo

More wind energy at: http://www.claverton-energy.com/energy-experts-library/downloads/windenergy

More energy files at: http://www.claverton-energy.com/energy-experts-library/downloads

Also:

Wikipedia Intermittency article

Wikipedia  Wind Energy article

Popularity: 6% [?]

Is Wind Power Reliable

 

The following is a commentary on David Milborrow’s article in “New Power UK/Issue 1/February 2009″.

 

As David says, you would not design a thermal power generating system which did not have built in reserve. He has answered his comment about those letter writers being unconcerned (or unaware) that there was a shortage of nuclear output during the cold snap in early January.   “Why should they have been concerned/aware?”   The system is designed for this. Read More→

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