Relationship, requires input

Transmission and distribution grid requires input Power transformer

The stored status is what a reviewer approved. The level below it is what the overlapping data support; the two are shown side by side and only a human moves the status.

Stored statusEstablished relationEvidence level (latest analysis)not analysed yet

Mechanism, evidence, reviewer judgements

The edge as stored

Transmission and distribution grid requires input Power transformer2 evidenceEstablished relation

Transmission and distribution grid depends on Power transformer.

Mechanism

Power is transmitted at high voltage to limit losses and stepped down for distribution. Every generator connection, substation and distribution feeder passes through transformers, so grid expansion and interconnection queues move with transformer supply and lead times.

Evidence

documentIEA, Electricity Grids and Secure Energy Transitions (2023)iea.orgGrid expansion, connection queues and transformer and cable supply chains.checked 2026-09-07
documentEIA, Electricity explained: how electricity is delivered to consumerseia.govTransmission at high voltage, step-up and step-down transformers, distribution.checked 2026-09-07

Status: established_identity_or_engineering_relation
Reviewer confidence: 0.99
Stated strength: 1.00
Lag: not stated
Version: curated_seed_v1
Reviewed: 2026-09-07

Confidence and strength are curated judgements recorded with the edge, not measured quantities.

Entity pages: Transmission and distribution grid, Power transformer. Part of the mechanism More delivered electricity needs more transformers, which need copper, aluminum and electrical steel.

Not computed

Statistical evidence

No analysis has been stored for this edge. The causal.analyze_all job runs monthly over every edge with a catalog metric linked to both entities; edges without a series on both ends are not analysed.

Not computed

Causal estimate

A causal estimate needs at least 20 overlapping periods and was not attempted for this edge yet.

What each rung means

Levels

Level 0: No association found
the overlapping data show no significant association.
Level 1: Correlation only
statistically associated in the overlapping periods; no direction, no mechanism.
Level 2: Predictive lead/lag
one series historically contains predictive information about the other.
Level 3: Mechanism supported
a documented physical, economic or institutional mechanism with cited evidence.
Level 4: Causally supported
a backdoor-adjusted estimate that survived refutation, on stated assumptions.
Level 5: Established relation
follows from engineering, accounting or scientific structure.

Every stored run, newest first

Analysis history

No runs stored.