- Original article
- Open Access
Exploring the link between energy security and subjective well-being: a study of 22 nations
Energy, Sustainability and Societyvolume 9, Article number: 34 (2019)
Energy has long been recognized as foundational for well-being, and recent work, has documented a link between access to energy services and health. In this analysis, we ask how worries about the energy system—in the form of access, cost, reliability, and sustainability—influence self-rated health.
Using data from 22 nations and some 30,000 respondents, we find that worries about energy security reduce self-rated health. Partial proportional odds models suggest that this effect varies across thresholds of self-rated health, wherein individuals highly worried about energy security are significantly less likely to report “Very Good” self-rated health.
Worries about energy security reduce subjective well-being, suggesting another avenue through which energy relates to human health.
The development of modern energy systems has led to marked improvements in the standard of living for large portions of the world’s population . In an oft-cited quote, E.F. Schumacher remarked that energy systems are “not just another commodity, but the precondition of all commodities, a basic factor equal with air, water, and earth” . On a macro-historical scale, energy is recognized as a prerequisite to prosperity and flourishing humanity [35, 41, 49].
Energy, especially that produced via combustible fuels like wood and fossil fuels, is also associated with a range of public health and environmental problems [17, 33]. Further, well-being could probably be maximized at levels of energy consumption much lower than that found in wealthy nations like the USA and Western Europe [9, 20, 47, 48]. Increasingly, research is pointing to energy security as a key variable in the relationship between energy and well-being [24, 25]. In this paper, we ask how worries about energy security influence self-rated health. To do so, we leverage representative cross-national data for 22 nations and a novel partial proportional odds modelling strategy. In the next section, we describe the ongoing debates about how to define energy security.
What is energy security?
Energy security is widely understood as a complex, multi-dimensional phenomenon that defies a simple definition with definitions of energy security growing in scope over time . Chester  critiques early definitions of energy security as often relying upon on a relatively simplistic logic wherein energy security was primarily understood in terms of affordability. Sovacool and Mukherjee  conducted qualitative elicitation interviews with energy policy experts. The authors observed that energy security is “a synergistic concept that rests on multiple interconnected dimensions, akin to a complex ecosystem that is comprised of comprised of individual species and their interaction” (pg. 5436). The authors advance a framework identifying multiple dimensions of energy security: availability, affordability, technological development (i.e., the ability of technology to adapt to changes), sustainability, and regulatory schemes. Hernández  identifies three dimensions of energy security that are highly consequential for human health—economic energy security refers to the affordability of energy relative to household income, physical energy security (i.e., the quality of energy infrastructure, housing, and the like), and behavioral energy security. The latter refers to behavioral modifications made to adapt to energy security in the first two domains. Hughes  argues that energy conservation is a key component of energy security.
Although the specifics of these definitions vary, there are some commonalities between the divergent conceptualizations of energy security. Each definition implicitly recognizes that reliable, affordable energy services are necessary to promote human well-being. Yet a secure energy system secure does more than simply provide affordable and reliable energy. Rather, a truly secure energy system is adaptive and able to quickly deal with external changes, such as supply chain interruptions created by natural disasters, geopolitical events, or terrorist attack. Thus, a secure energy system is arguably not overdependent upon energy imports or is at least able to rapidly adjust to reductions in energy imports.
A small body of literature has tracked cross-national individual perceptions of energy security. In a series of related papers, Sovacool and collaborators have worked to describe perceptions of energy and energy security. Sovacool  leveraged survey data from a diverse set of 12 countries, noting that preferences for a sustainable, efficient, and democratic energy system cut across cultures and nations with remarkable consistency. In a related study, Sovacool and Tambo  report that female respondents report more concern about the sustainability dimensions of energy security, but residents of affluent nations were no more apt to emphasize the link between climate change and energy production. Thus, there is a small body of literature that tracks perceptions of energy security across nations but more research in this area is needed. In the next section, we review the small body of research on the intersection between energy security and well-being.
Energy security and health
Energy is broadly recognized as a prerequisite to progress and well-being, although current levels of energy consumption in developed nations exceed that necessary to maximize well-being [9, 20, 47, 48]. Increasingly, research identifies a connection between energy security and well-being.
Hernández  provides a comprehensive conceptual model that maps the linkages between energy security and health, broadly construed. Their framework suggests that energy security has three distinct dimensions: economic, physical, and behavioral. Economic insecurity refers in general terms to a households’ ability to pay for energy services; physical infrastructure refers to the quality of the built environment in terms of energy efficiency, thermal comfort, and air quality exposures. Behavioral energy security is conceptualized as adaptive household behaviors as a result of burdensome energy costs or poor built environmental quality. Hernández  proposed an “energy insecurity pathway to disease and disadvantage” that portrayed energy security as a mediating mechanism between social disadvantage and poor health. For Hernandez , energy insecurity erodes health status via several causal pathways related to indoor environmental quality (e.g., thermal comfort, mold, gas leaks).
Some literature links energy security to human health in the USA. The literature identifies a “heat or eat” trade-off faced by low-income households where some necessities (e.g., food) are prioritized over others like thermal comfort and adequate heat [14, 39]. Cook et al.  considered the connection between energy security and childhood health in several US cities. Net of controls, energy insecurity was associated with an increased likelihood of hospitalization, lower self-rated health, and developmental problems among children. In a study of urban US residents, Hernández and Siegel  found that controlling for race and income, energy insecurity—measured as inability to pay utility bills and service interruptions—was associated with increased asthma, pneumonia (within the past 12 months), depression, and poor sleep quality. However, the effect of energy security on self-rated health was not statistically significant. Fernández et al.  finds a relationship between hardship (measured as inability to pay a utility bill), food insecurity, and behavioral problems in children in 20 US cities. This relationship between food security and energy security has similarly been observed in Canada .
Research in this area has also emerged from Europe. Using a large French sample, LaCroix and collaborators report an association between energy security and self-rated health [31, 32]. Disabled persons may be especially vulnerable to health problems caused by energy insecurity . Another body of literature considers “fuel poverty,” again typically conceptualized as a household’s inability to afford adequate energy services, particularly adequate thermal comfort . For instance, Harrington et al.  find that residing in a cold, damp home is associated with feelings of depression in the northern UK. Healy (2003) used national-level data for EU nations and reports that excess winter deaths in EU nations may be a result of insufficient heating. Demski et al.  is one of the few comparative studies of perceptions of energy security—the authors find that national-level factors like energy prices, electricity consumption, and GDP per capita explain perceptions of energy security across nations.
Thus, prior research indicates that energy security is linked to health across various domains, but several questions remain. To the best of our knowledge, most of the research has been conducted with major metropolitan areas of a few counties, with a handful of international comparative studies that employ contextual data. Thus, there is a need for cross-national comparative perspectives in this area. Further, prior research has focused primarily on how affordability or the experience of a loss of energy services impacts health, especially among children. However, another possible pathway that connects energy security to health is rooted in anxiety and worry about energy access, affordability, dependability, and sustainability—all aspects of energy security. Similar to worries about financial security, worries about energy security could induce stress, causing a loss of well-being.
In the next section, we describe the data we use to examine this hypothesis cross-nationally.
Methods and data
Survey data is provided by the of the 2016 European Social Survey (ESS), Wave 8 . There is a paucity of cross-national data on perceptions of energy security, but the 2016 ESS includes a special module with several items addressing energy security and indicators of subjective well-being. Data was collected in the latter half of 2016, primarily using CAPI and face-to-face interviews. The instrument underwent exhaustive pre-testing in each nation and was conducted in the languages appropriate for a given nation. The 2016 ESS covers the following 22 nations: Austria, Belgium, Czech Republic, Estonia, Finland, France, Germany, Hungary, Iceland, Ireland, Israel, Italy, Lithuania, Netherlands, Norway, Poland, Portugal, Romania, Russia, Slovenia, Spain, Sweden, Switzerland, and the UK. Within-country response rates ranged from 42.8 (UK) to 69.6% (Poland). The smallest number of completions was 880, in Iceland, while for most nations, over 1500 respondents completed the survey.
Outcome: self-rated health
Our dependent variable is a measure of self-rated health (SRH). SRH is a popular indicator, particularly in cross-national research, because of its strong predictive validity—that is, individuals who rate their health as poor are more likely to be in poor health as measured by more objective indicators . Poor self-rated health is also associated with all-cause mortality [8, 28, 38], a relationship that persists cross-nationally [3, 23]. People tend to report improvements in self-rated health when their actual health status changes, such as after significant voluntary weight loss . Thus, SRH provides a useful, externally valid snapshot of well-being, particularly useful for cross-national studies, where collecting data about objective health status would be cumbersome and resource-intensive. Figure 1 provides the distribution of SRH. Most respondents reported “Good” or “Very Good” health, with relatively few (1.4%) indicating “Very Bad” health.
Predictor: energy security worries
The 2016 ESS contains a special module, “Public Attitudes to Climate Change, Energy Security, and Energy Preferences” including questions assessing worries about energy systems. Respondents were asked to report (i) how worried they were that energy was too expensive for many people, (ii) that their nation was too dependent upon energy imports, (iii) that natural disasters might disrupt energy delivery, (iv) that the energy system might produce insufficient power, (v) that technical failures might lead to disruptions, and (vi) that terrorist attacks might cause disruptions in energy delivery. Each item is scaled from “not at all worried” to “extremely worried,” with higher scores indicating more worry. We combined these items into an additive scale with a Cronbach’s alpha of 0.85, where the lowest score “1” represents a lack of energy security and a “5” represents the maximum amount of worry.
Prior research has identified several correlates of self-rated health, and we accordingly include appropriate control variables. First, self-rated health is associated with social capital ([30, 34, 36, 50]; 34. Although we cannot include predictors for every aspect of social capital, the ESS does include several indicators for trust—trust is often conceptualized as a component of social capital. Thus, we create scales for Generalized Trust (i.e., the belief that most people are trust-worthy, Cronbach’s alpha = 0.762) and Institutional Trust (i.e., trust in major social institutions, such as the state, legal system, or law enforcement, Cronbach’s alpha = 0.901).Footnote 1 More details about the specific survey items constituting these scales can be found in Appendix 1.
We also control for current health with a question that asked if respondents were limited by sickness or injury (1 = no, 2 = to some extent, 3 = a great deal), and we control for disability status (0 = not disabled, 1 = disabled). Several studies link unemployment to a loss of well-being, an effect that seems to endure even after new employment is found [1, 21, 56]. To capture unemployment, respondents were asked if they have experienced unemployment in the past 3 months or in the past 12 months in two distinct questions (0 = no, 1 = yes). Sex was captured with a binary variable (0 = female, 1 = male), age is measured in years, education has seven categories (following ISCED classification), and respondents were also classified by income decile for their nation. Table 1 displays descriptive statistics for the control variables.
A standard approach to modelling ordinal outcomes like SRH is the ordinal logistic regression model, also known as the proportional odds model. This model rests upon the assumption that the regression coefficients do not vary across categories of the outcome variable (or, more formally, the cutpoint equations)—this assumption is typically called the parallel lines or proportional odds assumption [18, 19]. In our application, an ordinal logistic regression model would assume that worry about energy security would have the same effect on the probability of “Very Good” self-rated health as it would on the probability of any other category of self-rated health. This proportional odds assumption is often violated because the effect of a predictor often varies across categories of the outcome variable. Prior research has shown that the proportional odds assumption is often violated in the case of subjective well-being data (e.g., Authors; 2015; ).
There are several courses of action in the face of a proportional odds assumption violation. Researchers could rely on theory to determine when to relax the assumption. However, most social science theories offer little specifics on when a theoretically salient predictor should vary across categories of an outcome. At times, researchers may ignore this violation for the sake of parsimony and estimate an ordinal logistic regression model. Alternatively, some might implement a multinomial logistic regression model, which estimates a unique coefficient for each variable for each category of the outcome variable, not just those that have violated the proportional odds assumption. The obvious drawback of the multinomial approach is that the analyst must interpret very complex model output, with a unique coefficient (and associated p value) for each category of the outcome variable for every predictor, all in relation to a base outcome.
In this analysis, we implement the generalized ordinal logistic regression model, also known as the partial proportional odds (PPO) model [52, 53]. The PPO model performs a series of Wald tests to determine if each predictor has violated the proportional odds assumption across all outcome categories. When the assumption is violated, the PPO model relaxes the effect of that specific predictor, allowing it to vary across categories of the outcome variable. However, if the proportional odds assumption is not violated, the effect of that predictor remains fixed across the outcome (identical to an ordered logistic regression). In this way, the PPO model provides key advantages over the restrictive ordinal logistic regression model and the more cumbersome multinomial regression approach.
Non-linear models can be notoriously difficult to interpret , and the PPO model is more complex than a simple binary or ordinal logistic regression. To complement our regression tables, we also provide predicted probabilities derived from our models. These probabilities are calculated by manipulating the scores of our energy worry scale within different categories of self-rated health, holding all other variables at their observed scores. Our models include fixed effects for each country to control for unobserved heterogeneity across nations. We don’t report the fixed effects in our tables below, but provide full results in Appendix 2 and Appendix 3.
Before estimating our PPO model, we present some simpler models to understand the relationship between our predictors and outcome. Following related analyses (e.g., [27, 29]), we begin with an OLS regression, where SRH is treated as a continuous outcome. We then proceed with a binary logistic regression model, where “Very Good” self-rated health is compared to all other categories. Lastly, we then estimate the full PPO model. All models include appropriate weighting as described the ESS technical documentation .
Preliminary models: OLS regression and binary logistic regression
Table 2 displays the results of our OLS regression model. Consistent with our expectations, worries about energy security reduce SRH (b =− 0.07, p < .01). Among our controls, relationships are largely consistent with prior literature, wherein income, education, and trust all improve SRH. The OLS model explains 44% (R2 = 0.444) of the variation in SRH. In Table 2, we also provide odds ratios and standard errors for the binary logistic regression model for “Very Good” self-rated health. The estimated direction of the relationships is consistent with those from the OLS model—worries about energy security reduce SRH (OR = 0.74, p < 0.01). Again, those with higher socioeconomic status and trust tend to report better health.
Partial proportional odds model
The proportional odds assumption was violated for several variables. These include our focal predictor, Energy Security Worry, the dummy variables for education, age, sickness, and many of the country fixed effects. Thus, we relax the proportional odds assumption for these variables. In practical terms, this means that the odds ratios for these predictors vary across categories of SRH, as shown in Table 3. If the proportional odds assumption was not violated, we omit the odds ratios at categories below “Good” SRH to improve the presentation of our regression table because these odds ratios are stable across categories of SRH. Further, coefficients are presented for all but one of the response outcomes (“Very Good”), due to the estimation technique utilized.Footnote 2
We focus our description of the results on the focal predictor variable—Energy Security Worry—but also note other important relationships. Worry about energy security reduces the probability of “Fair” (OR = 0.81, p < 0.01) and “Good” (OR = 0.76, p < 0.001) SRH. However, the effect is not significant for the “Very Bad” and “Bad” categories.
In Fig. 2, we present the predicted probabilities of energy security worries across each outcome of SRH. The probabilities underscore the results reported in Table 3 but provide important clarifications. Energy security worries do not change the likelihood of reporting “Very Bad” health to any practically significant degree—indeed, the probability of “Very Bad” health is barely above 0.0, even for respondents with a great deal of worry about energy security. Similarly, panel 2 of Fig. 2 also implies that worries about energy security do not enhance or erode the probability of “Bad” health. However, worries about energy security become more consequential for the higher categories of SRH. People who are extremely worried are some 0.12 more likely to report “Fair” health than those who report little worry about the energy system (i.e., a probability of 0.20 vs 0.32, respectively). Worries about energy security slightly increase the probability of “Good” SRH, but the size of this effect is miniscule in practical terms. Importantly, energy security worries appear to most substantially effect the likelihood of reporting “Very Good” SRH. People with no worries about energy security have a probability of 0.31, but decreases to 0.15 for those with a high degree of worry. Hence, Fig. 2 suggests that primary effect of energy security is to significantly reduce to probability of people reporting “Very Good” health and increase the probability of “Fair” SRH. That is, worries about energy security do not appear to cause the people in our sample to report ill health as a result.
The literature on SRH is vast, and prior studies have identified a multitude of individual and contextual level factors that correlate with self-rated health. Because of this, we undertook robustness checks to determine under what conditions our inferences about self-rated health might not hold because of an omitted variable. We use the pkonfound user-written command in Stata 15/IC to estimate the correlation of an omitted variable with our focal predictor (energy security worries) and SRH for each category of SRH [15, 16]. We use this command to determine the number of cases that would have to be replaced with a case of zero effect to make the relationship lose its statistical significance.
We found that, to render the “Good” coefficient statistically non-significant, 80% of the cases would have to be replaced with a case of no effect. For the “Fair” coefficient, 75.2% of the cases would have to be measured with error to invalidate the inference. Thus, the ESS data would have to contain a great deal of measurement error to reverse our core finding that energy security worries influence self-rated health. It is possible that an omitted variable could attenuate the relationship between energy worries and SRH. However, socioeconomic factors are the most likely correlates of both energy security and SRH, and our estimates already control for these variables. Hence, the effect of Energy Security Worry could be attenuated by an unmeasured non-economic variable, but the literature does not point to an obvious candidate for this variable.
The purpose of this paper was to understand the relationship between energy security and subjective well-being. To accomplish this aim, we used cross-national survey data and a novel set of indicators for worries about energy security, with self-rated health as the dependent variable, leveraging partial proportional odds models to understand the nuances of this relationship. This manuscript represents one of the few cross-national studies of energy security and well-being.
Results suggest that worries about energy security have a substantial association with SRH. Worries about energy security do not appear to be associated with very bad health, but they may lead some otherwise healthy individuals to report lower SRH. However, this effect is inconsistent across categories of SRH. Energy security worries reduce the likelihood of people reporting “Very Good” health. But, worries about energy security do not seem to drive people to report very poor self-rated health. We were able to reveal this importance nuance by implementing the partial proportional odds model. In addition to being statistically significant, our analysis of predicted probabilities indicates that this relationship is important in practical terms as well. Thus, worry about energy security has a practically relevant impact on self-rated health, suggesting that improving energy security could enhance self-rated health. This finding is especially significant because SRH is positively associated with a range of health problems, implying that the effect of energy insecurity on health might be broad.
We view this manuscript as an initial effort to understand the link between self-rated health and energy security, but far more research is needed in this area. The bulk of the research on energy security and health has been conducted in developed nations in urban settings. Greater attention is needed to non-urban places, developing countries, and even developed nations that might have certain spatially and economically marginalized populations outside of metropolitan areas. Studying these populations is increasingly important as they may face unique problems of access and reliability of energy services. Although our study is cross-national, we note that most of the countries under study have relatively advanced economies and energy systems. Future research should develop an understanding the relationship between energy security and well-being in a developing nation setting given that these populations are the most energy insecure. As is common in many areas of the social sciences, there is a marked lack of longitudinal research in this area—this analysis suffers from this same limitation. Moving forward, we suggest that future researchers gather panel data to establish causal connections between improvements in energy security and enhanced well-being. Further, most of the literature on energy security and health has focused primarily on objective, physical health maladies , but this analysis suggests that energy security might also have non-trivial impacts on subjective well-being and more general quality of life. There are multiple promising strains of research on the intersection of well-being and energy security.
Availability of data and materials
Data is available freely from the European Social Survey via the links provided in the references.
We also performed a factor analysis on these items using the principal factor component method for extraction and a varimax rotation. The factor analyses confirmed that a single, latent factor underlies both sets of trust items.
Within partial proportional odds models, the models are separately estimated for each outcome of the response variable, like estimating a series of logistic regressions. For the first outcome “Very bad,” models are estimated with response 1 = 0 and responses 2, 3, 4, and 5 = 1. For the second outcome “Bad,” models are estimated with responses 1 and 2 = 0 and 3, 4, and 5 = 1. This pattern continues with the further responses. No results are reported for the final outcome, “Very good,” as the model would be estimated with responses 1, 2, 3, 4, and 5 = 0, and therefore, nothing would equal 1 .
Partial proportional odds
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