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Tag Archives: grid balancing

Why not nuclear and renewables?

By Dave Elliott

Nuclear plants do not generate carbon dioxide, so why can’t we have nuclear AND renewables, supporting each other, as a response to climate change? In evidence to the Energy and Climate Change Select Committee in July Amber Rudd MP, DECC Secretary of State, suggested that despite its high cost nuclear baseload ‘enables us to support more renewables’ and was needed since, ‘as we all know, until we get storage right, renewables are unreliable’. Can nuclear really support renewables, and is it really low carbon?

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Plenty of renewables – and they can be balanced

By Dave Elliott

Is there enough renewable energy to meet global needs and can the use of variable sources be effectively balanced?  Recent reports say yes on both counts. In terms of the total resource, a GIS-based study of land/sea use/availability has put the total 2070 global potential for renewable electricity at up to 3,810 EJ, led by solar PV, with about a third of the PV being on buildings. The total estimated resource was roughly in line with most other global renewable studies, like that from the IPCC, and well above likely total global electricity demand, put at around 400 EJ: www.sciencedirect.com/science/article/pii/S0959378015000072 (more…)

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World Bank looks to renewable integration

By Dave Elliott

‘With the right combination of new policies and investments, countries can integrate unprecedented shares of variable renewable energy into their grids without compromising adequacy, reliability or affordability’. So says the World Bank in a study of renewable integration and grid balancing options, focusing on energy storage and gas fired- back up plants, but also looking at other balancing options . (more…)

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Capacity Market – the first UK auction

By Dave Elliott

In a fully free-market energy supply system there is no direct commercial incentive for generation companies to ensure that the lights stay on long term, by investing in new and/or backup capacity. Given that some old plants are scheduled for closure and more reliance on sometimes variable renewables is planned, the UK government has stepped in to create a new ‘capacity market’ to try to fill the potential gap in terms of reserve capacity and grid balancing capacity. (more…)

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Balancing variable renewables

By Dave Elliott

There is now a range of books looking at the technical and policy options available for managing the use of variable energy resources such as wind and solar energy. The pioneering text in this area was Earthscan’s “Renewable Electricity and the Grid” from 2007, edited by Godfrey Boyle , with contributions from many of the UK top experts. But the field has since expanded with, for example, a lot of new work being done in the US. (more…)

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Europe and supergrids – balancing grids across the EU

By Dave Elliott

A pan-European supergrid network could play a major role in helping Europe achieve an ambitious 45% share of renewable energy by 2030 at low extra cost, by balancing grids and limiting curtailment,  according to a new Greenpeace report,  PowE[R]2030, based on analysis by Energynautics, and using data from the International Energy Agency.

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Smart meters and smart grids

By Dave Elliott

The newly emerging energy system will need new grids of various types. In my previous two posts I looked at international low-loss High Voltage Direct Current supergrids, and suggested that though they may well be developed in the years ahead, the process could be uneven and incremental, starting with local/national smart grids designed to aid local balancing of variable supply and demand. (more…)

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Balancing variable renewables- capacity markets, smart grids or super grids?

By Dave Elliott

The previous few posts have looked at the state of play with renewables in some key countries. In many cases an urgent issue is grid integration and balancing. The variable outputs from wind and PV solar outputs are balanced on some grid systems by using existing fossil-fueled plants, but the later are having a hard time competing, now that some of their peak market has been taken over by low marginal cost (zero fuel cost) wind and PV. To ensure that there is enough capacity still available capacity markets have been proposed, offering extra payments. Some critics don’t like the sound of that- it’s yet another subsidy, in effect for fossil fuel. However, the proposed UK version includes payment for energy storage and demand management options, as well as for gas-fired back up plants, and longer term, fossil gas might be replaced by green gas in the latter. There again there are other balancing options- supergrid links for example, which would open up a new multi-national balancing market.  Which option is best? (more…)

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Germany’s green energy

By Dave Elliott

Renewables have continued to grow in Germany, providing around 23% of total electrical generation from around 32GW of wind and 32GW of PV solar, most of this  being locally owned capacity, including  projects run by a growing number of local energy co-ops. And it works well: in bitterly cold March last year, the wind and PV were supplying about half of total electricity at one point:http://reneweconomy.com.au/2013/graph-of-the-day-wind-solar-provide-half-germanys-energy-output-88052.

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US green energy: store, curtail – or export?

by Dave Elliott

The US is pressing ahead with renewables, with around 60GW of wind and 10GW of PV solar already in place.  But that means some system operation issues are coming to the fore.  Since these sources vary, as does demand, when there is surplus output from wind of PV, should it be stored or just dumped?

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