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A Framework for Measuring Energy System Resilience

• The building blocks of resilience are inputs, which define what is available to support resilience. At the input level, metrics tend to describe the amount of energy produced, transmitted, or stored or the number of people, facilities, or equipment available to support this.
• The ways in which inputs are organized to support resilience are called capacities. Metrics describe the existence and extent of systems, policies, and organizations in place to support energy capabilities.
• Capability metrics reflect how well capacities can serve a system when they are needed.
• Performance metrics describe what is produced by an engineered system. Metrics describe the quality, amount, and efficiency of the services being provided.
• In the end, the performance of energy systems depends on how the systems generate the outcomes that society is seeking to achieve. At the outcome level, metrics describe how energy influences aspects of societal welfare through health, safety, and the economy.

The State of Energy System Resilience Metrics

• The metrics present a complex picture of how resilience is managed and measured in energy systems. While many metrics exist, there is no single metric or set of metrics for each purpose.
• The literature review discovered more papers and metrics for electricity systems than for systems for oil or natural gas.
• The literature reviewed pays more attention to metrics for the more detailed levels of facilities and systems.
• Regional and national metrics identified focus more on aspects of performance and outcomes.