Energy & electric grid | Modelled case study
Map cryptography between grid control centres and substations
Which operational links and devices can migrate, and which must be isolated until replacement?
The modelled organisation
A recognisable problem reaches the operating agenda
This composite scenario follows the OT Security · Transmission Operations · CIP Compliance 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
Control networks mix modern IP links, serial gateways, vendor tunnels, engineering access, and devices with decades-long service life.
Event that forces action
NERC CIP assessment, control-centre refresh, or post-quantum infrastructure programme.
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.
energy management systems
control-centre links
substation gateways
market and field communication trust
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
Control networks mix modern IP links, serial gateways, vendor tunnels, engineering access, and devices with decades-long service life.
Frame the decision the owners must make
Which operational links and devices can migrate, and which must be isolated until replacement?
Apply QNSI to the controlled boundary
Record algorithms, certificates, keys, vendors, physical locations, owners, criticality, and observed evidence in QNSI.
Leave the team with a concrete result
A control-path cryptographic asset register with replacement cohorts and documented compensating controls.
Prove the result in the organisation's environment
The utility tests protection-system timing, vendor support, safety, recovery, approved change windows, and CIP applicability.
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 control-path cryptographic asset register with replacement cohorts and documented compensating controls.
Independent validation boundary
The utility tests protection-system timing, vendor support, safety, recovery, approved change windows, and CIP applicability.
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.