InfraRisk Index and red flags

Purpose

The InfraRisk Index gives one score for selected risks of an asset, so that you can rank assets. The benchmark percentile ranks that score in a cohort. Red flags show specific issues that the active rules find.

Inputs: five risk families

Family	What it covers
Natural Hazards	Expected and severe physical-damage losses.
Environmental	Habitat and floodplain constraints.
Buildability	Land, soil and slope constraints.
Interconnection	Transmission connection cost and distance estimates.
Revenue Risk	Year-to-year revenue variation.

Method

1. Each family gets a score.
2. A risk profile sets the weight of each family. The weighted scores give the index, from 0 to 100.
3. The benchmark percentile compares the index with the selected cohort: Continental US or ISO Region.
4. Separately, the active red-flag rules check for specific issues.

For the weights of each profile and the list of red-flag rules, see Risk profiles and red flags.

Outputs

Index score (0–100)

A lower score means lower modeled risk under the selected weights.

Benchmark percentile (0–100)

A higher percentile means higher risk than the cohort. For example, the 90th percentile means a higher score than about nine in ten assets in the cohort. The score and the percentile are different quantities.

Red flags

Red flags are separate from the weighted score. Active pass-or-fail rules flag issues such as extreme hail tail loss or critical habitat. Red flags stay visible even when the weighted score is moderate.

Assumptions

• A weight of zero removes a family from the score. It does not mean that the risk is absent.
• Each profile activates a different set of red-flag rules.

Limitations

• The score is not a loss probability.
• Compare scores only with the same profile and cohort.
• A red-flag count of zero does not mean that every possible issue was checked. Check which rules are active.

For all limitations, see Limitations.

Validation

Version

Applies to methodology version 1.0, September 2026.