A Practical Searchable Symmetric Encryption Scheme for Smart Grid Data

Outsourcing data storage to the remote cloud can be an economical solution to enhance data management in the smart grid ecosystem. To protect the privacy of data, the utility company may choose to encrypt the data before uploading them to the cloud. However, while encryption provides confidentiality to data, it also sacrifices the data owners' ability to query a special segment in their data. Searchable symmetric encryption is a technology that enables users to store documents in ciphertext form while keeping the functionality to search keywords in the documents. However, most state-of-the-art SSE algorithms are only focusing on general document storage, which may become unsuitable for smart grid applications. In this paper, we propose a simple, practical SSE scheme that aims to protect the privacy of data generated in the smart grid. Our scheme achieves high space complexity with small information disclosure that was acceptable for practical smart grid application. We also implement a prototype over the statistical data of advanced meter infrastructure to show the effectiveness of our approach

Electricity Network Scenarios for Great Britain in 2050

The next fifty years are likely to see great developments in the technologies deployed in electricity systems, with consequent changes in the structure and operation of power networks. This paper, which forms a chapter in the forthcoming book Future Electricity Technologies and Systems, develops and presents six possible future electricity industry scenarios for Great Britain, focussed on the year 2050. The paper draws upon discussions of important technologies presented by expert authors in other chapters of the book to consider the impact of different combinations of key influences on the nature of the power system in 2050. For each scenario there is a discussion of the effects of the key parameters, with a description and pictorial illustration. Summary tables identify the role of the technologies presented in other chapters of the book, and list important figures of interest, such as the capacity and energy production of renewable generation technologies

Equitable Access to Basic Utilities: Public versus Private Provision and Beyond

Providing universal access to basic utilities is justified on human rights grounds and also because of the positive externalities involved. Adequate provision of water, sanitation and electricity contributes to the achievement of the other Millennium Development Goals (MDGs). Access to these services, however, is still unequal in the developing world. Services do not adequately reach the poor. This Poverty in Focus brings together a mix of policy issues and some country experiences. Degol Hailu and Raquel Tsukada provide an overview of the broad challenges involved in making access to basic services equitable and universal. Hulya Dagdeviren and Simon A. Robertson point out the difficulties of expanding utility networks in slum areas, which include technical barriers and a lack of land and housing tenure. They make a case for stronger public interventions. Kate Bayliss argues that the allocation of demand and investment risks during privatisation in Sub-Sahara Africa is distorted. This is because the risks are borne by governments and end users instead of the private contractors. David Hall and Emanuele Lobina provide a critique of both the investment potential of the private sector and cost recovery schemes in the provision of sanitation services. Ashley C. Brown discusses the externalities involved in supplying basic infrastructure to those who can least afford it. He argues that, contrary to established views, cross-subsidy schemes actually benefit all users and not only the targeted population. Alison Post emphasises the benefits of water metering but highlights problems of implementation and poor design in Argentina. Degol Hailu, Rafael Osorio and Raquel Tsukada examine the reasons for the privatisation and then renationalisation of the water supply in urban Bolivia. Andre Rossi de Oliveira explores water privatisation in Brazil. He argues that the expansion of coverage has stemmed mainly from high levels of investment by private operators. Suani Teixeira Coelho, Patricia Guardabassi, Beatriz A. Lora and José Goldemberg note that geographically isolated communities without access to electricity grids, such as those in the Amazon, can be served by renewable energy sources. Luc Savard, Dorothée Boccanfuso and Antonio Estache present the findings of a general equilibrium model that assesses the impact of electricity price changes on the poor in Mali and Senegal. Joana Costa, Degol Hailu, Elydia Silva and Raquel Tsukada empirically show that water provision reduces the total work burden on women in rural Ghana. Nitish Jha conducts a sociological analysis of access to water and sanitation in India, emphasising the challenges encountered in community-based schemes. Julia Kercher explains why and how a human rights framework must guide the design and implementation of private utility provision. We hope that this collection of articles will contribute to the discussion of how to provide vital infrastructure services more equitably. This Poverty in Focus is the result of an International Workshop on Equitable Access to Basic Services held on 5 December 2008 in São Paulo, Brazil. IPC-IG and the David Rockefeller Centre for Latin American Studies at Harvard University (DRCLAS) jointly organised the workshop. We gratefully acknowledge DRCLAS? contribution. (...)Equitable Access to Basic Utilities: Public versus Private Provision and Beyond

Water Pricing Models: a survey

This paper surveys water pricing models, highlighting some important results. Efficiency rquires marginal cost pricing. Intra-annual price changes or customer differentiation to reflect differences in marginal costs can enhance efficiency. A marginal cost pricing mechanism may signal the value that consumers attribute to further capacity expansions as the water supply system approaches its capacity limit and marginal cost rises. However, pure marginal cost pricing may not be feasible while respecting a revenue requirement because marginal costs may be higher or lower than average costs. The most common ways of combining efficiency and revenue requirements are through the use of two-part tariffs, adjusting the fixed charge to meet the revenue requirement, or through second-best pricing like Ramsey pricing. It is not evident whether the best scheme is a two-part tariff or some other pricing mechanism. The role of block rate pricing, increasingly more frequent in actual pricing practices, is yet to be fully investigated.water pricing models; capacity constraints; scarcity; revenue requirements; second-best pricing; block rate pricing

Pricing Methods

In order to consider the range of pricing methods available, it is first necessary to choose a definition for road pricing. The term "road pricing" has been criticised as an inaccurate description of systems which is applied to (Thompson, 1990) and there is some inconsistency regarding the extent of charging policies which are considered to be included. A liberal definition could cover any fiscal form of traffic restraint, affecting the mode, time, route, destination of frequency of journeys. In this case road pricing already exists worldwide through taxes imposed upon the purchase and licensing of vehicles and through fuel taxation. The extension of conventional taxation arrangements has been used as part of road pricing strategies in both Hong Kong and Singapore (Dawson and Brown, 1985; LPAC, 1991). However, the essence of most road pricing work has been to replace and supplement these existing charges, which do not discriminate by time, location or amount of vehicle use, with charging structures which are directly related to these issues. For this reason the descriptions road-use pricing, congestion pricing and road user charging are sometimes preferred, and some recent texts have attempted to impose a narrower definition for road pricing, in which only charging systems relating directly to the time and distance travelled are included (CIT, 1992). For the purposes of this review it is best to retain the conventional term of road pricing and apply the broadest definition

The distributional incidence of residential water and electricity subsidies

Subsidies to residential utility customers are popular among policymakers, utility managers, and utility customers alike, but they are nonetheless the subject of much controversy. Utility subsidies are seen as a way to help make utility service affordable for poor households and as an alternative mechanism for income redistribution. These arguments in favor of subsidies are countered by serious concerns about their adverse effects on consumer behavior, utility operations, and the financial health of utilities. Both the affordability and redistributive arguments for subsidies are based on the presumption that poor households benefit disproportionately from water and electricity subsidies, that they are well-targeted to the poor. The authors test this assumption by examining the extent to which the poor benefit from consumption and connection subsidies for water and electricity services. Their analysis of a wide range of subsidy models from around the developing world shows that the most common form of utility subsidy-quantity-based subsidies delivered through the tariff structure-are highly regressive. Geographically targeted or means-tested subsidies do better, and in many cases have a progressive incidence, but large numbers of poor households remain excluded. Low levels of coverage and metering severely limit the effectiveness of consumption subsidy schemes to reach the poor. Simulations suggest that connection subsidies are an attractive alternative for low coverage areas, but only if utilities have the means and motivation to extend network access to poor households and only if those households choose to connect.Economic Theory&Research,Town Water Supply and Sanitation,Tax Law,Urban Water Supply and Sanitation,Energy Production and Transportation

Which economic model for a water-efficient Europe? Report of a CEPS Task Force. CEPS Task Force Report, 27 November 2012

This CEPS Task Force Report focuses on how to improve water efficiency in Europe, notably in public supply, households, agriculture, energy and manufacturing as well as across sectors. It presents a number of recommendations on how to make better use of economic policy instruments to sustainably manage the EU’s water resources. Published in the run-up to the European Commission’s “Blueprint to Safeguard Europe’s Waters”, the report contributes to the policy deliberations in two ways. First, by assessing the viability of economic policy instruments, it addresses a major shortcoming that has so far prevented the 2000 EU Water Framework Directive (WFD) from becoming fully effective in practice: the lack of appropriate, coherent and effective instruments in (some) member states. Second, as the Task Force report is the result of an interactive process involving a variety of stakeholders, it is able to point to the key differences in interpreting and applying WFD principles that have led to a lack of policy coherence across the EU and to offer some pragmatic advice on moving forward

Smart Regulation for Smart Grids

Climate change and security of supply policies are driving us towards a decarbonization of the electricity system. It is in this context that smart grids are being discussed. Electricity grids, and hence their regulatory frameworks, have a key role to play in facilitating this transformation of the electricity system. In this paper, we analyze what is expected from grids and what are the regulatory tools that could be used to align the incentives of grid companies and grid users with what is expected from them. We look at three empirical cases to see which regulatory tools have already been applied and find that smart grids need a coherent regulatory framework addressing grid services, grid technology innovation and grid user participation to the ongoing grid innovation. The paper concludes with what appears to be a smart regulation for smart grids.Regulation, innovation, electricity, grids, transmission, distribution

Benefits and costs of introducing tariff choice in uncontested markets – A Report for Ofwat

1. Theoretical models indicate that allowing a regulated company to introduce optional (or self selecting) tariffs can make individual consumers (and consumers on average) better off and be profitable for the company, as long as the original (regulated) tariff remains available to all consumers. 2. The models contain some restrictive assumptions and limitations and may be difficult to apply in practice. 3. One particular assumption crucial to the benefits is that consumers choose the best tariff for themselves. More recent research on consumer behaviour in general and in utilities in particular show that this may not be the case. Much of the market literature has been concerned with the telecoms and energy markets. 4. There may be distributional concerns if some consumer groups are less likely to choose well, particularly if there are likely to be long term effects on the ‘base’ tariff. Such concerns are reflected in the current British energy regulator’s consultation on reducing tariff choice for both suppliers and consumers as a response to perceived failure of competition. This experience raises questions about the intrinsic value of choice for consumers. 5. Experience of optional metering in England and Wales provides some evidence of how residential water consumers have responded to that particular tariff choice. Other evidence on water consumer perceptions indicates that the assumptions made in theoretical models of tariff choice may not be applicable to this market. This may affect the applicability of welfare assessments made in the models. 6. We conclude by identifying some questions about the circumstances in which allowing optional tariffs (alongside a regulated base) is likely to be beneficial

What's Blocking the Sun?: Solar Photovoltaics for the U.S. Commercial Market

Provides an overview of installation trends and investment climate for solar photovoltaics in the U.S. commercial sector, including policy and economic obstacles. Recommends strategies for the solar industry, the commercial sector, and policy makers