Methodology
This page explains how start and end anchors, stage definitions, overlap handling, eligibility rules, source hierarchy, and confidence labels are applied before a figure is published.
Scope
Ireland / TransmissionAll projects and All technologiesMethod version
v2-manual-case-rebuildPublished from a scoped case registry rather than a population datasetSnapshot date
1 Apr 2026Only manually rebuilt, duration-bearing cases should re-enter this active snapshot. Archived legacy material remains outside the publication path until re-vetted.Method overview
The current delivery work asks whether transmission project timelines can be reconstructed from public materials in a way that is precise enough for comparative research and regulatory scrutiny.
Planning, permitting, post-consent challenge / review, and build are the published stage variables. Median and p90 delivery time are aggregate readouts built on top of case-level segment allocations inside those stages.
Statutory files, operator controls, project updates, operational signals, and proxy programme evidence are kept distinct through typed anchors and confidence labels.
A case can appear in the registry yet remain excluded from published metrics when the active public record still lacks required end or boundary anchors.
Definition frame
Delivery start
First formal public project-control or consent anchor used as the comparable start point.Where a statutory pre-application or application filing date is publicly available, that is preferred. Where it is not, the registry may use the earliest published operator gateway or equivalent control milestone and mark any reduced precision and anchor class explicitly.
Delivery end
Earliest dated public signal of energisation, commissioning, operational readiness, or entry into commercial operations.If an exact operational date is not public, the registry uses the earliest dated public signal that the project has reached that state and keeps the derivation visible on the case record.
Stage model
Planning, permitting, post-consent challenge / review, and build are treated as analytically distinct published stages.The published diagnosis still exposes four rolled-up stages, but the case registry now stores second-level segments beneath them where official milestone boundaries are available. Older or thinner public records remain coarser and are labelled as such on the case page.
Overlap rule
Where phases overlap, the registry allocates time through explicit segments and does not double-count the same calendar interval in two published stages.Overlap, challenge holds, source-versioning, and proxy choices remain visible on the case page against the underlying milestone evidence.
Eligibility rule
Only cases with complete start, end, and required phase-boundary anchors are included in the published diagnosis metrics.Incomplete or still-live cases remain in the registry with exclusion reasons and missing or disputed fields listed explicitly.
Reading order
Current limits