Risk-based vegetation work before fire season
Vegetation contact is a leading cause of faults and, in dry areas, of fire risk. Prioritising trims by measured clearance and growth means fewer vegetation faults and better evidence for the regulator.
- Context
- GIS / EAM: Ashcombe circuit has 214 spans, 38 of them in a high fire-risk zone
- LiDAR survey, 6 weeks old: 11 high-risk spans have vegetation inside the clearance trigger distance
- Growth model: 2 of the 11 are fast-growing species projected to reach minimum clearance in about 3 weeks
- Contractor schedule: framework tree crew has 4 crew-days free this month, enough for the 11 spans
- Rule
- Any span in a high fire-risk zone inside the trigger distance gets a trim order due within 30 days; any span projected to reach minimum clearance within 30 days is urgent and due within 7 days.
- Decision
- Trim 11 spans, 2 urgent Severity: High
- Agents
- Survey agent Reads the LiDAR and growth data per span and explains which conductors are at risk and by when.
- Access agent Checks landowner access, protected sites and nesting-season restrictions for each span before the crew is sent.
- Scheduling agent Sequences the 11 spans into the contractor’s 4 crew-days, with the 2 urgent spans first.
- Policy
- Trim orders under the existing framework contract and within the approved budget may be released automatically. Whole-tree removal, work on protected sites or anything outside the contract needs the vegetation manager. Clearance evidence is kept for the applicable standard, such as NERC FAC-003 for in-scope transmission lines.
- Action
- 11 trim work orders released automatically in the EAM and dispatched to the contractor, 2 marked urgent, and landowner notices sent through the standard access process.
- Data
- Network spans and circuits (GIS)Asset and work history (EAM)LiDAR and imagery surveysFire-risk zones and weatherContractor schedules and contracts