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Increasing the Value of Wind with Energy Storage

Ramteen Sioshansi

Year: 2011
Volume: Volume 32
Number: Number 2
DOI: 10.5547/ISSN0195-6574-EJ-Vol32-No2-1
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Abstract:
One economic disincentive to investing in wind generation is that the average market value of wind energy can be lower than that of other generation technologies. This is driven by the exercise of market power by other generators and the fact that the ability of these generators to exercise market power is inversely related to real-time wind availability. We examine the use of energy storage to mitigate this price suppression by shifting wind generation from periods with low prices to periods with higher prices. We show that storage can significantly increase the value of wind generation but the currently high capital cost of storage technologies cannot be justified on the basis of this use. Moreover, we demonstrate that this use of storage can reduce consumer surplus, the profits of other non-wind generators, and social welfare. We also examine the sensitivity of these effects to a number of parameters including storage size, storage efficiency, ownership structure, and market competitiveness--showing that a more-competitive market can make storage significantly more valuable to a wind generator.



The Hidden System Costs of Wind Generation in a Deregulated Electricity Market

Timothy D. Mount, Surin Maneevitjit, Alberto J. Lamadrid, Ray D. Zimmerman, and Robert J. Thomas

Year: 2012
Volume: Volume 33
Number: Number 1
DOI: 10.5547/ISSN0195-6574-EJ-Vol33-No1-6
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Abstract:
Earlier research has shown that adding wind generation to a network can lower the total annual operating cost by displacing conventional generation. At the same time, the variability of wind generation and the need for higher levels of reserve generating capacity to maintain reliability standards impose additional costs on the system that should not be ignored. The important implication for regulators is that the capacity payments ["missing money"] for each MW of peak system load are now much higher. Hence, the economic benefits of reducing the peak system load using storage or controllable demand will be higher with high penetrations of wind generation. These potential benefits are illustrated in a case study using a test network and a security constrained Optimal Power Flow (OPF) with endogenous reserves (SuperOPF). The results show that the benefits are very sensitive to 1) how much of the inherent variability of wind generation is mitigated, and 2) how the missing money is determined (e.g. comparing regulation with deregulation).Keywords: Electricity markets, Wind generation, Optimum dispatch, Endogenous reserve capacity, Missing money, Total annual system costs.



Blowing in the Wind: Vanishing Payoffs of a Tolling Agreement for Natural-gas-fired Generation of Electricity in Texas

Chi-Keung Woo, Ira Horowitz, Brian Horii, Ren Orans, and Jay Zarnikau

Year: 2012
Volume: Volume 33
Number: Number 1
DOI: 10.5547/ISSN0195-6574-EJ-Vol33-No1-8
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Abstract:
We use a large Texas database to quantify the effect of rising wind generation on the payoffs of a tolling agreement for natural-gas-fired generation of electricity. We find that while a 20% increase in wind generation may not have a statistically-significant effect, a 40% increase can reduce the agreement's average payoff by 8% to 13%. Since natural-gas-fired generation is necessary for integrating large amounts of intermittent wind energy into an electric grid, our finding contributes to the policy debate of capacity adequacy and system reliability in a restructured electricity market that will see large-scale wind-generation development.Keywords: Wind generation, Tolling agreement, Spark spread option, Investment incentive



Storing Wind for a Rainy Day: What Kind of Electricity Does Denmark Export?

Richard Green and Nicholas Vasilakos

Year: 2012
Volume: Volume 33
Number: Number 3
DOI: 10.5547/01956574.33.3.1
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Abstract:
Physical laws mean that it is generally impossible to identify which power stations are exporting to another country, but economic logic offers strong clues. On windy days, Denmark tends to export electricity to its neighbours, and to import power on calm days. Storing electricity in this way thus allows the country to deal with the intermittency of wind generation. We show that this kind of behaviour is theoretically optimal when a region with wind and thermal generation can trade with one based on hydro power. However, annual trends in Denmark's trade follow its output of thermal generation and are inversely related to Nordic production of hydro power and the amount of water available to Scandinavian generators, with no correlation with wind generation. We estimate the cost of volatility in Denmark's wind output to equal between 4% and 8% of its market value. Keywords: Electricity, Wind generation, Hydro generation, Storage, International trade



Integration of Renewables into the Ontario Electricity System

Brian Rivard and Adonis Yatchew

Year: 2016
Volume: Volume 37
Number: Bollino-Madlener Special Issue
DOI: 10.5547/01956574.37.SI2.briv
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Abstract:
The Ontario electricity industry has a 'hybrid' structure: electricity is bought and sold in a competitive wholesale electricity market while supply mix planning and procurement are conducted through a government agency. Most generation is secured through long-term contracts. Aggressive renewable energy programs have led to rapidly growing renewable capacity, mainly wind generation. Coal-fired generation has been eliminated and electricity sales have dropped. The competitive hourly market price has declined and there is a clear merit-order effect: an increase of wind generation from 500 MW to 1500 MW can be expected to decrease price by 7 CAD/MWh. However, the all-in price, which incorporates contractually guaranteed supply prices, has risen from about 60 to 100 CAD/MWh between 2009 and 2014. Operational and market integration of renewable resources has been achieved relatively smoothly. The procurement process is over-centralized: increased reliance on market discipline and greater separation between governmental policy makers and regulators would enhance both the efficacy and efficiency of decarbonization policies.





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