A planned 21-day major overhaul at a 500 MW unit ran 9 days over schedule because three contractor crews showed up for the same work window expecting access to the same turbine bay, and nobody had cross-checked the critical path against actual resource availability until the conflict was already blocking work. The overrun cost an estimated ₹14 crore in extended replacement power purchases alone. The scope was fine. The planning coordination was not. Sign up for OxMaint to plan major overhauls with a single coordinated critical path instead of disconnected contractor schedules.
AI-Based Maintenance Planning for Major Power Plant Overhauls
Coordinate resource allocation, contractor scheduling, and critical path sequencing for major overhauls in one CMMS-driven plan — so a 21-day outage stays a 21-day outage, not a 30-day one.
Why Major Overhauls Run Over Schedule — and What Each Day Actually Costs
Outage overrun is rarely caused by one dramatic failure. It is usually the compounding effect of several small coordination gaps that nobody catches until work is already blocked on-site.
Multiple crews planned for the same equipment access window without a shared schedule, forcing one crew to wait while the other finishes — a delay that compounds across every dependent task downstream.
A critical replacement part ordered without accounting for actual lead time arrives three days after the crew assigned to install it has already moved to the next task and demobilized.
A task assumed to be independent turns out to block four other tasks once work begins, because the dependency was never mapped formally before the outage started.
Planners find out a task is running behind only at the next morning meeting, losing eight to twelve hours of potential recovery time on every slip.
From Scope Definition to Critical Path — the AI Planning Workflow
Deferred work orders, inspection findings, and OEM-recommended overhaul tasks are pulled together into a single master scope list, eliminating the scattered spreadsheets that usually feed outage planning.
OxMaint's AI planning engine analyzes task relationships from your asset hierarchy and historical work order sequences to surface dependencies that are easy to miss in manual planning.
The longest dependent chain of tasks is identified and visualized, showing planners exactly which tasks have zero schedule slack and which have float to absorb minor delays.
Crew assignments, equipment access windows, and specialized tooling availability are cross-checked against the schedule, flagging double-bookings before the outage starts rather than during it.
Every task requiring a part is checked against actual procurement lead time, flagging any task scheduled before its required material is confirmed to arrive on site.
Field technicians update task status from mobile, giving planners live visibility into schedule slip the moment it happens instead of waiting for the next morning meeting to find out.
Coordinate Scope, Contractors, and Parts in One Schedule — Not Six Spreadsheets
OxMaint's planning team works with your outage lead to build the master schedule from your existing scope list and contractor commitments, typically completed four to six weeks before outage start.
Major Overhaul Types and Typical Planning Lead Time
| Overhaul Type | Typical Duration | Planning Lead Time | Primary Coordination Risk |
|---|---|---|---|
| Turbine Major Overhaul | 18–25 days | 8–12 weeks | OEM specialist crew availability |
| Boiler/HRSG Inspection Outage | 10–15 days | 6–8 weeks | Refractory and tube replacement parts |
| Generator Rewind/Inspection | 15–21 days | 10–14 weeks | Specialized lifting and test equipment |
| Cooling Water System Overhaul | 7–10 days | 4–6 weeks | Multi-contractor access sequencing |
| Electrical Switchyard Maintenance | 3–5 days | 3–4 weeks | Grid coordination and de-energization |
Outcomes Plants Report After Moving to Coordinated AI-Assisted Outage Planning
Who Needs Visibility Into the Outage Schedule — and Why Silos Cause Overrun
A major overhaul touches more teams than any other plant activity, and overrun risk rises sharply whenever one of these groups is working from an outdated or disconnected version of the schedule.
Needs the consolidated critical path and real-time slip status to make daily go/no-go decisions on schedule recovery actions throughout the outage window.
Need confirmed equipment access windows and dependency status before mobilizing crews, to avoid arriving on site only to find the previous task is still in progress.
Need visibility into which tasks are coming up next so critical parts are staged and verified on site before the crew assigned to install them arrives.
Needs confirmed task completion status to plan the startup and commissioning sequence, since starting up before all dependent work is verified complete creates its own safety and reliability risk.
What a Structured Post-Outage Review Should Actually Capture
Comparing planned and actual completion time for every task identifies which estimates were systematically optimistic, improving accuracy for the next overhaul's schedule.
Each delay logged during the outage is reviewed for root cause — parts, labor, access conflict, or unexpected finding — building a pattern library that informs future risk buffers.
Inspection findings discovered during teardown become part of the asset's permanent CMMS history, informing the scope for the next scheduled overhaul rather than being lost in a closeout report.
AI-Assisted Outage Planning on OxMaint — Common Questions
OxMaint's AI planning engine analyzes your asset hierarchy and historical work sequences to suggest dependencies automatically, then your outage lead reviews and confirms the proposed critical path. This significantly reduces manual mapping time while still giving planners final control over the sequence. Sign up to build a critical path from your existing scope list.
Every contractor crew assignment is checked against the equipment access schedule and other crew commitments during the planning phase, flagging any overlap where two teams are assigned to the same asset or workspace at the same time. This conflict check runs continuously as the schedule is being built, not just once at the end. Book a demo to see conflict detection on a sample schedule.
Yes. Technicians and crew leads update task status, log completion percentage, and flag blockers directly from the OxMaint mobile app at the work site, giving the outage control room real-time visibility into schedule status throughout each shift rather than only at morning meetings. Sign up to configure mobile progress tracking for your next outage.
Each task requiring material is linked to its procurement record, and OxMaint flags any task scheduled before its required parts are confirmed to arrive, giving planners advance warning to either expedite procurement or resequence the task before the outage begins. Book a demo to see parts-to-schedule reconciliation.
Yes. The same critical path and resource conflict checking applies to shorter planned outages and routine maintenance windows, scaled to the complexity of the work involved. Many plants start using OxMaint's outage planning on smaller windows before applying it to a full major overhaul. Sign up to plan your next maintenance window, large or small.
Coordinate Scope, Contractors, and Parts Before the Outage — Not During It
OxMaint builds a single coordinated critical path for your major overhaul, surfacing resource conflicts and parts gaps weeks before mobilization, with real-time progress tracking once work begins.
