The energy diversification benefit
One of my favourite courses from university was in my last semester of school and on the topic of Energy Engineering. Different from typical engineering courses, the content was not all technical. It was a good balance between the science of different energy sources (i.e. Coal, Oil, NatGas, Wind, Solar, Nuclear, Geothermal etc.), along with insights into the political, societal and environmental implications that comes along with their implementation.
We were encouraged to think critically about how to address the issue of balancing energy supply and demand in light of the ever-growing body of evidence around climate change. The final question of the final exam asked us to outline what we thought the energy mix of the future was. There was no right or wrong answer to this question – as long as it was justified with supporting evidence.
Thinking about the answer of this question from an engineering point of view, I structured my answer around a common framework that many people typically think of energy in – baseload vs peakload demand. Baseload demand energy was the ‘always on’, reliable, and non-volatile source of energy crucial for keeping the lights on. I argued the types of energy sources fitting this category should be either nuclear or enhanced geothermal. Peakload energy was the opposite – energy that could be ramped up or down based on demand. The typical sources of energy in this case I argued should be the renewable energies of the world (and maybe natural gas for a bit).
I generally concluded, as most other engineers would, that there is no one energy source that will dominate in the future – an all the above strategy seemed sensible to providing what we would need.
Fast forward a few years after leaving that classroom, one thing that I quickly learned in the ‘real world’, was that almost everything was dominated by finance, and with that, the concept of risks and returns. This version of the world placed a heavy emphasis on evaluating decisions by trying to maximize returns whilst minimizing risk.
I also learned very quickly that minimizing risk meant being well diversified and ensuring that you were not overly concentrated in any one asset class. Relatively uncorrelated or negatively correlated assets were the keys to limiting volatility. This formed the basis for the concept of a diversification benefit – the idea that on average you’ll realize more value from the sum of the parts, than any one individual component.
Thinking about this in the context of energy, it wasn’t that much of a stretch to think of financial assets as energy sources, and financial returns as the actual energy produced. Different energy sources (like assets) can be more or less volatile than others with their production (like cashflows or returns) driven by different external factors. Going back to that course in school, I started to see that the ‘all the above’ energy concept was really just the idea of ‘diversification’ explained in a slightly different way.
This got me thinking. If a diversification benefit can be calculated for a portfolio of assets, why can’t the same thing be calculated for a portfolio of different types of energy? I believe that we should think of different energy portfolios (that supply a particular population of people) in the same way that we think of financial portfolios.
Only in this way can we avoid making decisions based purely on overly simplistic economics. The case and point here in the US is the recent discovery of shale which, on the surface, makes any cost/benefit analysis based on current day gas prices conclude that other energy sources are not viable. This type of short-term thinking has the potential introduce substantial concentration risk into our energy system and substantially weaken its resilience to shocks.
Quantifying the diversification benefit is paramount to allowing for a meaningful conversation about the future of energy, and the role of different players. Those involved in different aspects of the energy industry should realize that they’re all tracking the same goal, and that everyone has a role to play. To succeed, we need to stop thinking of energy sources in silos, and to approach it more holistically as a true system.