ERRS Worksheet · University of Oklahoma

Enhanced Reliability and Resilience Score (ERRS) Worksheet

Purpose The Enhanced Reliability and Resilience Score (ERRS) provides a clear, consistent way to compare and prioritize mitigation options. It combines expert judgment with a quantitative framework to weigh options on a common scale and identify those that most effectively improve energy system reliability and resilience relative to cost.

Instructions Start by identifying two or more mitigation options under consideration. Then evaluate each option across the components listed below, using a 1–5 scale for each. If some components matter more than others, agree on their relative importance before scoring. Apply a combination of expert and stakeholder judgment to ensure that a broad range of perspectives inform the scoring and weighting process.

Calculation

Calculation Steps Add the Reliability and Resilience scores first, then multiply by the Feasibility, Acceptability, and Vulnerable Population Impact scores. Finally, divide the total by the Cost Score to get the ERRS value for each option.

Your scores above fill in the formulas below. Hover any box to see where it came from. ↴

Comparison

Reading the score

ERRS runs from 0.4 (lowest on every component, highest cost) to 1,250 (highest on every component, lowest cost). It is for comparing options against each other, not a pass/fail threshold.
Feasibility, Acceptability and Vulnerable Population Impact multiply, so a 1 on any of them cuts the score to a fraction of what the other scores would suggest.
Cost is the divisor: moving from a 2 to a 4 halves the ERRS, all else equal.
The weighted score is an importance-weighted average of all six scores. It runs from 1 to 5, and Reliability and Resilience each carry their own weight rather than being added together first.
Only relative importance matters: rating every component 3 gives the same result as rating every component 1.
When the two methods rank options differently, the importance ratings or the multiplication are driving the result. Talk that through before choosing.
Scores are only comparable when the same group scored the options with the same understanding of the scale.