1,721,135 research outputs found
Strategic behaviour by wind generators : an empirical investigation
Full text linkRenewable generation of electricity is a vital step in reducing dependence on fossil fuels, and wind generation is particularly important in countries such as Britain. A large part of the windfarms are in Scotland but links with England are relatively limited and subject to exogenous failure of an interconnector. As a consequence, for a significant portion of time the system operator imposes constraints on wind generation in Scotland. We investigate the resulting effects on a majority subset of these windfarms operating under a scheme called Renewables Obligation, which involves a subsidy on top of market price. One feature of this scheme is that windfarms each declare a price at which they are willing to be constrained; these prices are used in the selection of windfarms to constrain when necessary. Thus, windfarms are sometimes paid not to produce. We investigate the strategic consequences of this, given that the prices set by windfarms to turn off in practice exceed the opportunity cost, finding significant evidence consistent with windfarm strategic behaviour. Specifically, we observe that in making their final physical declarations of output, the sample windfarms overestimate their final physical notifications of generation, the more so when other circumstances suggest constraints will be required. Following our findings we propose two potential policies to reduce both the extent of over-prediction and the payments made to windfarms to curtail output
Revenues from storage in a competitive electricity market: Empirical evidence from Great Britain
No full textDespite the high upfront financial costs associated with the existing technologiesfor energy storage they have become more appealing in recent years in response to theincreasing importance of non-dispatchable sources of generation in the energy systems ofdeveloped countries. One of the essential pieces of information required to value the monetarybenefits which can be achieved when investing in energy storage is the price that energy willcommand when it is released, compared with the price paid when injected into the storage. Inthis paper we investigate this relationship using time series statistical techniques for variousmaturities of forward prices, using data on assessments of power prices for future delivery. Wewill examine the relationship for predictability and size of gap in order to answer questionsabout the likely financial benefits which can be obtained from optimal time management ofstorage facilities, using a technology neutral approach. Our initial results indicate that sucharbitrage opportunities exist for storage facilities, especially when energy is stored over a shorttermperiod of a day or a week
Market structure and entry in fast food
Full text linkOne of the phenomena of the twentieth century, chainstores, are remarkably little studied by economists. Amongst open questions are the following: What factors influence the pattern of their openings? Does the spread of one constrain others having broadly the same retail offer? Do they locate close to competitors? To answer such questions, one must examine a time path of development- put simply one must observe actual entry. This is precisely what is done in a series of papers (Toivanen and Waterson, 2000; 2001; Sault, Toivanen and Waterson -hereafter STW, 2002; forthcoming) we are working on concerning the spread of restaurant outlets in the UK. This paper sketches the main elements of our program, then examines a particular issue, the micro-geography of location, in detail
German energy market fallout from the Japanese earthquake
Full text linkThe German response to the Fukushima nuclear power plant incident was possibly the most significant change of policy towards nuclear power outside Japan, leading to a sudden and very significant shift in the underlying power generation structure in Germany. This provides a very useful natural experiment on the impact of changing proportions of conventional fuel inputs to power production, helping us to see how changed proportions in future as a result of policy moves are likely to impact. We find through use of a conventional demand- supply framework that despite the swift, significant change, the main impact was a relatively modest increase in prices occasioned by a shift of the supply curve; there were no appreciable quantity effects on the market, such as power outages, despite some views that the impacts would be significant
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Fast Food - the early years: Geography and the growth of a chain-store in the UK
Full text linkWe examine the development of UK outlets of a major fast food chain, from inauguration in 1974 until 1990, after which industry structure changed somewhat. The chain effectively introduced the counter-service burger concept. Locational spread across local authority district markets is explained by the characteristics of the areas where the outlets are sited. Of special interest is the effect of scale economies, measured by outlet numbers in neighboring districts. Both first and second entry are examined. We find that the hazard of first entry is positively influenced by market size and population density and negatively by distance from company headquarters.fast food, diffusion, regional economic activity, entry
Fast food - the early years: geography and the growth of a chain-store in the UK
Full text linkWe examine the development of UK outlets of a major fast food chain, from inauguration in 1974 until 1990, after which industry structure changed somewhat. The chain effectively introduced the counter-service burger concept. Locational spread across local authority district markets is explained by the characteristics of the areas where the outlets are sited. Of special interest is the effect of scale economies, measured by outlet numbers in neighboring districts. Both first and second entry are examined. We find that the hazard of first entry is positively influenced by market size and population density and negatively by distance from company headquarters
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
- …
