Energy & electric grid | Modelled case study
Constrain supplier remote-access trust in electric operations
Which supplier identity can reach which asset, for what task, using which credential and approval?
The modelled organisation
A recognisable problem reaches the operating agenda
This composite scenario follows the OT Access Management · Vendor Risk · Operations functions. It is grounded in the cited problem context but does not identify a real customer.
Operating environment
An electric utility coordinates control centres, substations, protection systems, field communications, market interfaces, recovery sites, and specialist suppliers.
What is at stake
Security work must fit narrow operating windows and preserve safe control, restoration capability, and accountable remote access to critical assets.
Situation
Emergency vendor accounts and shared support certificates persist across substations and generation sites after the original work ends.
Event that forces action
Supplier onboarding, access recertification, merger, or remote-access incident.
Concrete system boundary
Systems this case study puts in scope
The model is specific about the operational surfaces that must be discovered, changed, or independently checked.
vendor identities
jump hosts and remote gateways
substation and generation assets
work-order approval and session evidence
Modelled case study walkthrough
How this organisation would use QNSI
The walkthrough connects the real-world problem to a bounded QNSI contribution and an independently reviewable result.
Recognise the operating condition
Emergency vendor accounts and shared support certificates persist across substations and generation sites after the original work ends.
Frame the decision the owners must make
Which supplier identity can reach which asset, for what task, using which credential and approval?
Apply QNSI to the controlled boundary
Inventory supplier cryptographic identities, endpoints, issuers, validity, owner, and authorized service window in QNSI.
Leave the team with a concrete result
A vendor trust ledger exposing shared credentials, expired work orders, overbroad reach, and revocation evidence.
Prove the result in the organisation's environment
The operator tests enforcement at jump hosts and endpoints, session monitoring, emergency approval, and contract controls.
What useful success looks like
A decision artifact plus proof from the real environment
The model stops at a target result. It becomes an actual case study only when a customer produces and independently validates this evidence in production.
Decision artifact
A vendor trust ledger exposing shared credentials, expired work orders, overbroad reach, and revocation evidence.
Independent validation boundary
The operator tests enforcement at jump hosts and endpoints, session monitoring, emergency approval, and contract controls.
Real-world problem grounding
Primary sources behind the model
These sources establish the external requirement, failure mode, or risk context used to model this case. They do not endorse HEOSSI or prove that QNSI completed the scenario.
Customer evidence status
This is modelled, not a customer claim
The organisation is a composite and the result is a target state. This page does not prove a deployment, customer outcome, certification, legal conclusion, regulator endorsement, or completed control.