DIW Economic Bulletin 6 / 2015
Since early 2009, electricity and gas distribution in Germany has been subject to incentive regulation designed to ensure greater efficiency in electricity and gas grid operation. However, it remains to be seen how changes to the regulatory framework will affect the investment behavior of distribution system operators. Against this background, the present study empirically analyzes the investment activities ...
2015| Astrid Cullmann, Nicola Dehnen, Maria Nieswand, Ferdinand Pavel
Diskussionspapiere 1641 / 2017
While the link between the ownership and productive efficiency of firms has been discussed extensively, no consensus exists regarding the superiority of one or the other in non-competitive, regulated environments. This paper applies a flexibleproduction model to test for efficiency differences associated with ownership types while allowing the production to adapt to market restructuring over time. ...
2017| Astrid Cullmann, Maria Nieswand, Julia Rechlitz
Diskussionspapiere 1555 / 2016
Revenue cap regulation is often combined with systematic benchmarking to reveal the managerial inefficiencies when regulating natural monopolies. One example is the European energy sector, where benchmarking methods are based on actual cost data, which are influenced by managerial inefficiency as well as operational heterogeneity. This paper demonstrates how a conditional nonparametric method, which ...
2016| Endre Bjoerndal, Mette Bjoerndal, Astrid Cullmann, Maria Nieswand
Diskussionspapiere 1531 / 2015
This paper, which is one of the first to estimate productivity in retail electricity for a European country after liberalisation, analyses the effect of ownership and governance structure by using a unique dataset of German electricity retailers from 2003 to 2012. An innovative service production function for the retail sector is derived with labour and external services as the main inputs. A structural ...
2015| Caroline Stiel, Astrid Cullmann, Maria Nieswand
Diskussionspapiere 1512 / 2015
We analyze the effects of an incentive based regulatory scheme with revenue caps on the investment behaviors and decisions of 109 electricity distribution companies operating in Germany in 2006-2012. We hypothesize that Germany's implementation of incentive regulation in 2009 has a negative impact on total investment, and that firms increase their investments in the base year. We build a model that ...
2015| Astrid Cullmann, Maria Nieswand
Diskussionspapiere 1426 / 2014
In this paper, we analyze the technical efficiency of CO2 reduction potentials of German power and heat plants, using a non-parametric sequential Data Envelopment Analysis. We apply a metafrontier framework to evaluate plant-level efficiencies in the transformation of inputs into desirable (energy) and undesirable (CO2 emissions) outputs, taking into account different fossil fuel generation technologies. ...
2014| Stefan Seifert, Astrid Cullmann, Christian von Hirschhausen
Diskussionspapiere 962 / 2009
This paper provides an empirical demonstration for a practical approach of efficiency evaluation against the background of limited data availability in some regulated industries. Here, traditional DEA may result in a lack of discriminatory power when high numbers of variables but only limited observations are available. We apply PCA-DEA for radial efficiency measurement to US natural gas transmission ...
2009| Maria Nieswand, Astrid Cullmann, Anne Neumann
Diskussionspapiere 960 / 2009
We analyze the technical efficiency of German and Swiss urban public transport companies by means of SFA. In transport networks we might face different network structures or complexities, not observed, but influencing the production process. The unobserved factors are typically modeled as separable factors. However, we argue that the entire production process is organized around different network structures. ...
2009| Astrid Cullmann, Mehdi Farsi, Massimo Filippini
Diskussionspapiere 956 / 2009
In this paper, we provide a comprehensive multivariate cointegration analysis of three parts of the steam coal value chain - export, transport and import prices. The analysis is based on a rich dataset of international coal prices; in particular, we combine data on steam coal prices with freight rates, covering the period December 2001 until August 2009 at weekly frequency. We then test whether the ...
2009| Aleksandar Zaklan, Astrid Cullmann, Anne Neumann, Christian von Hirschhausen
Diskussionspapiere 883 / 2009
This paper assesses the relative efficiency of knowledge production in the OECD using a nonparametric DEA approach. Resources allocated to R&D are limited and should therefore be used efficiently given the institutional and legal constraints. This paper presents efficiency scores based on an intertemporal frontier estimation for the period 1995 to 2004 and analyzes the impact of the regulatory environment ...
2009| Astrid Cullmann, Jens Schmidt-Ehmcke, Petra Zloczysti