The Social Costs of Solar Energy

A Study of Photovoltaic Energy Systems

Thomas L. Neff

• Publisher: Pergamon
• Year: 2013
• Print ISBN: 9780080263151
• eBook ISBN: 9781483149660
• Topic: Business
• Subtopic: Business General
• Index: Business

The Social Costs of Solar Energy: A Study of Photovoltaic Energy Systems covers issues of implementing a solar energy power source. Comprised of eight chapters, this book tackles several topics that are relevant to the use of solar energy as an alternative power source. The opening chapter is an introduction, which provides a review about solar energy. The succeeding chapters then cover the implications of implementing such technology, including the methodology, occupational risks, public health risks, environmental impacts, economic, and logistics challenges. This book will be of great interest to any readers concerned with the environmental, economic, and social repercussion of using solar energy.

Chapter 1

Introduction

Social costs are associated with all commonly used electrical energy sources. These costs arise from effects on public and occupational health and on the environment; they also originate in a number of important effects on social and political processes. The use of coal, for example, not only affects the health of miners and the public and the environment (throughout such impacts as mine drainage, acid rain, and a possible increase in global CO₂ levels) but also raises other national and even international political and social issues. Among these are conflicts resulting from power plant siting, from inequities between coal-producing and coal-consuming regions, and from the movement of pollutants from coal combustion across state or national boundaries. For nuclear power the mix of such impacts is different, but significant impacts certainly exist. Thus, for example, while nuclear power probably involves lower average impacts on health and environment than coal under normal operating conditions, there are countervailing negative effects from the possibility of nuclear accidents, from the difficulties in managing the disposal of wastes, and from the international security threat of nuclear weapons proliferation. The impacts associated with conventional electrical energy sources, despite decades of use, are still highly uncertain in their identity and magnitude; experience suggests that we have not yet become aware of the extent to which even conventional energy technologies involve significant social costs.

The existence of substantial social costs (known and possible) associated with conventional technologies provides incentive to develop new energy technologies characterized by demonstrably small impacts on human health and the environment or, perhaps, by contributing less to the causes of social and political conflict than do conventional sources. In the popular mind, solar energy technologies have come to be associated with precisely these virtues. Among the solar technologies, thermal electric and photovoltaic generation of electricity are those most often thought of as substitutable for current electrical generation systems. While popular conceptions undoubtedly play a role in the initial acceptance of a new technology, current policy decisions, and the long-term success of a new technology, must rest on critical evaluation of the social costs associated with that technology, as compared with conventional alternatives. Given large uncertainties about these alternatives, and the even larger uncertainties associated with a yet immature new technology, this is indeed difficult. It is not, however, impossible to make such evaluations, at least qualitatively, and in some instances, quantitatively.

In this study we shall present a preliminary social cost evaluation of photovoltaic technologies, emphasizing qualitative comparisons with electricity generation systems based on coal (and, in some cases, nuclear fuels).^* Where possible and important in this study, quantitative assessments of photovoltaic impacts will be performed. These typically will be rough calculations intended to establish relative priorities in policy issues. In many cases, calculations will be performed in the spirit of upper bound—or worst case—situations. Calculations of this type are of great value if it can be shown that the maximum possible impacts of new technology are well below the minimum impacts known to be associated with conventional sources of electricity. The value of this type of comparison is especially great because the large uncertainties currently involved in evaluation of conventional technologies, especially coal, lead to a perceived (and very likely also a real) probability of increasingly high social costs. Thus, if it is possible to establish firm upper bounds on photovoltaic impacts, one has thereby established a basis for evaluating the value of that technology in avoiding not only the currently known costs of conventional sources, but also the risk of currently unknown, but potentially high, costs which might eventually be found to be associated with them. It should be remembered, however, that upper bound calculations probably overstate the true impacts of photovoltaics and should be used only for the policy purposes indicated. Careful and comprehensive health and environmental analyses will be required for dealing with more detailed policy issues and for establishing the regulatory basis on which photovoltaic devices will be manufactured and used.

Comparison of the impacts of different energy technologies can be examined in the several dimensions affected:

• Occupational safety and health impacts arising at the various stages of production, installation, and use. Both immediate effects such as accidents or toxic exposures and long-term health effects must be considered.

• Public health impacts arising from the above stages. These result from routine emissions or from accidents and generally involve assessment of long-term, low-level health effects as well as immediate effects. The standards for public health effects are generally much more restrictive than those for occupational impacts.

• Environmental effects, including impacts on ecosystems, land use, and thermal, climatic and other effects.

• Impacts on social, political, economic, and institutional processes. Different energy devices involve different mixes of the factors of production: among them, capital, labor, energy, and materials. The applications of these technologies also have major implications for societal decisions and decision processes, for choices of living and development patterns, and for the balances between regional or ideological political interests. While the nature of these impacts may be described independently, relative assessment invariably involves social judgments.

In subsequent chapters, we shall deal with the first three of these categories, on a comparative basis, for photovoltaic technologies and applications. With respect to the fourth category, we limit our attention here to the effects attributable to differing factors of production. The broader sociopolitical issues remain to be addressed in future research.

Before embarking on our analysis, it is useful to identify some of the methodological problems which must be resolved in comparing photovoltaic systems with conventional and alternative energy sources and to sketch the important characteristics of photovoltaic technologies.

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^*Ultimately, photovoltaics may be competitive with coal and nuclear power; in the interim, it will more likely compete with oil and natural gas for peak load generation. The comparison in this case is somewhat more difficult since the primary social costs associated with oil and gas (except for sulfur and particulates for some oil) are opportunity costs: the drawing of oil and gas away from other uses and resulting price increases due to higher demand.

Chapter 2

Methodological Issues

Publisher Summary

In assessing the relative health and environmental impacts of photovoltaic and alternative technologies, several methodological problems arise. These include establishing the basis for proper allocation of social costs, the incomparabilities of different types of social costs and the impossibility of making value-free overall comparisons, the constraints on the displacement of social costs associated with one energy technology by those of another, and the difficulty of accounting for social costs indirectly related to the use of a given energy technology. This chapter discusses these methodological problems. The first methodological issue is a normalization problem stemming from the fact that sunlight is an inconstant source of energy. While fossil and nuclear facilities may be operated as continuously as is technically feasible, solar power installations are limited by variations in insolation, including diurnal, seasonal, and weather-induced var0iations. Because of this, social costs cannot be assessed on the basis of installed peak-generating capacity. Instead, it is useful to prorate effects over the electrical energy produced. The second methodological problem in comparing energy technologies is that different technologies have qualitatively different impacts and thus may not be directly comparable. The third methodological problem is that deployment of one energy technology must be seen as displacing use of another. Accounting for this raises the allocation and commonality issues above, and incomplete consideration may give misleading results. The fourth problem that arises in the assessment of any energy technology is that there are important underlying and antecedent social costs that may be less evident than the direct effects of the technology.

In assessing the relative health and environmental impacts of photovoltaic and alternative technologies, several methodological problems arise. These include establishing the basis for proper allocation of social costs, the incomparabilities of different types of social costs and the impossibility of making value-free overall comparisons, constraints on the displacement of social costs associated with one energy technology by those of another, and the difficulty of accounting for social costs only indirectly related to the use of a given energy technology. Since the resolution of these problems strongly affects social cost comparisons, each deserves discussion in greater detail.

Social Cost Allocation

The first methodological issue is a normalization problem stemming from the fact that sunlight is an inconstant source^* of energy. While fossil and nuclear facilities may be operated as continuously as is technically feasible, solar power installations are limited by variations in insolation (diurnal, seasonal and weather-induced variations). Because of this, social costs cannot be assessed on the basis of installed peak generating capacity. Instead, it is useful to prorate effects over the electrical energy produced; for example, the deaths or injuries or emissions levels ascribable to the generation of a kilowatt-hour or gigawatt-electric year GWe-yr) of electricity. The latter unit, equivalent to 8.76 to 10⁹ kwh,¹ will be used throughout this study.^**

While this device does a great deal to reduce very different technologies to a common measure of social disutility, it should be noted that it is not a perfect basis for a relative social cost/benefit comparison since a kilowatt-hour produced at the time of peak demand may be regarded as providing a higher social benefit. Since peak photovoltaic generation generally coincides with the onset of peak demand, it can be used to relieve peak load generating requirements (now generally satisfied by burning oil or natural gas), if it is used in the electric grid. However, if photovoltaics were to be used in stand-alone applications, it would be necessary to use energy storage systems, such as batteries or flywheels, to hold power until needed. These storage systems usually involve additional social costs which may or may not be equal to the additional benefit of having the power available on a continuous basis. For purposes of comparison in this study, we ignore these use parameters. However, they may be of great importance in determining the social utility of specific proposed installations.

Incomparability and Social Values

The second methodological problem in comparing energy technologies is that different technologies have qualitatively different impacts and thus may not be directly comparable. For example, it is difficult to compare the health impact of coal mining on coal miners with the effects on the public of perceptions of risks associated with nuclear wastes. Impacts may be different in character, may affect different groups or institutions in society, and may even affect different generations. In dealing with this problem, the first step in analysis is clearly to estimate, within the limits set by imperfect knowledge, social impacts in various categories—occupational deaths, injuries, delayed health effects, analogous public health impacts, and so forth. For each energy technology one then has a balance sheet with many columns, with the entries in each column expressed in a different currency of social disutility.

While it is then possible to compare technologies in each category of impact, it is not possible to make a direct overall comparison between the impacts of different energy technologies without imposing social judgments about the relative importance of various types of impacts (the currency exchange values, as it were). For example, only society can decide whether an occupational death is more or less important than a given number of cases of degradation of health of members of the public, or a given level of risk to future generations. Efforts have been made to find a common currency—usually an equivalent dollar value for lives and other effects—and to the extent that society has commonly expressed such judgments (as in the case of occupational hazards), such efforts provide some guidance. However, it is not possible to provide an overall comparison between technologies in a way which is free of the social values of the analyst.

This lack of commonality is especially important in considering choices between energy technologies which have very different characteristics, since preference for avoiding one particular type of social cost may lead ...

Table of contents

• Cover image
• Title page
• Table of Contents
• Inside Front Cover
• Copyright
• Dedication
• Preface & Acknowledgments
• Chapter 1: Introduction
• Chapter 2: Methodological Issues
• Chapter 3: Potential Risk Centers in Photovoltaic Technologies
• Chapter 4: Occupational Safety and Health Impacts
• Chapter 5: Public Health Impacts
• Chapter 6: Environmental Impacts
• Chapter 7: Indirect Impacts: Labor, Materials, and Energy
• Chapter 8: Summary and Conclusions
• Modeling Public Exposures
• Index
• About the Author