Power T&D Industry Pack

Power Transmission & Distribution Forecasting

T&D programmes are governed by outage windows, consents and connection dates, dependencies largely outside your control. The forecast has to model that dependency risk explicitly rather than assume it away.

How the engine works
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Typical project-controls challenges in power t&d

The method is the same everywhere. These are the sector conditions that make a generic approach wrong, and what each one means for how you control the project.

Outage windows are granted, not chosen

System operator outages are scheduled far ahead and are hard to move. Missing one usually means waiting for the next planning cycle.

A missed outage can cost two quarters

Consents and wayleaves run long and unpredictably

Easements, planning consent and landowner negotiation have durations set by other parties and routinely exceed the construction they enable.

The longest activity is often paperwork

Connection dates carry contractual liability

Missing a customer or generator connection date has liquidated damages attached. The date is a liability, not just a milestone.

Late connection has a price per day

Long-lead plant dominates the programme

Transformers, GIS and cable carry lead times of a year or more. Order dates, not construction dates, set the achievable programme.

The order date is the real milestone

Energisation testing is late and unforgiving

Commissioning and energisation sit at the very end, where there is no float left, and any defect found is discovered at the worst moment.

Zero float at the highest-risk phase

Which capabilities apply

Every tool below is a separate workbook that works on its own. These are the ones power t&d teams tend to reach for, and what each one answers.

Analyse

  • Whether the programme you were sent is built properly, before you rely on it
  • Where the critical path really runs, and how much float is protecting it
Schedule Quality Analyser

Control

  • Cost and schedule performance against the baseline, in CPI and SPI
  • Change and risk exposure on one register, not in email
The core suite

Forecast

  • Outturn cost and completion date as a range, not a single number
  • The contingency needed to be 80% confident, not 50%
Forecast Engine

Measure

  • Progress claimed against rules of credit rather than opinion
  • An update block you can paste straight back into P6
Progress Measurement System

Contract & claims

  • Whether a submitted programme meets NEC4 clause 31.2
  • Productivity loss measured against an unimpacted period
NEC4 Compliance Disruption & Productivity Loss

Sustainability

  • Capital carbon baseline and forecast against target
  • Evidence trail for PAS 2080 assurance
Carbon & PAS 2080

How it runs, month to month

  1. Export two tables from P6 or Microsoft Project. An activity list and a relationship list. Nothing in your scheduling tool changes.
  2. Paste them in. The shaded cells are the only inputs. Everything else is formula-driven.
  3. Check the programme is sound. The schedule quality scorecard runs the DCMA checks and tells you what to fix before you forecast from it.
  4. Enter the period progress and cost. Earned value, actual cost and planned value by period.
  5. Read the forecast and issue the report. CPI, SPI, EAC and the P50 to P80 range, with the assumptions recorded alongside them.

What's in the Power T&D edition

The engine is identical across industries. The edition supplies the content that makes it speak your sector's language, so it is useful the first time you open it rather than after a fortnight of setup.

WBS skeleton

  • Consents & wayleaves
  • Civils & foundations
  • Substation build
  • Overhead line / cable install
  • Protection & control
  • Testing & energisation

Cost codes

  • Transformers & GIS
  • Cable per km by rating
  • Tower steel & stringing
  • Outage working premium
  • Consents & legal fees

Risk register

  • Outage window lost
  • Consent refused or appealed
  • Long-lead plant slip
  • Wayleave negotiation stalls
  • Energisation defect found late

Dependency milestones

  • Outage windows granted
  • Consent determination
  • Plant order & delivery
  • Customer connection date
  • Energisation & handover

Worked example

132kV reinforcement, month 14 of 26

BAC £58M. EV £27.9M, AC £30.4M, PV £29.6M. One wayleave is unresolved and the next suitable outage window is 11 weeks away.

CPI
0.92
EAC
£63.1M
LD exposure
£2.4M
P80 energisation
+14 weeks
Cost performance is unremarkable. The forecast that matters is £2.4M of liquidated damages exposure created by a single unresolved wayleave. A legal problem, not a construction one, and no amount of site resource will touch it.

Illustrative figures, shown to demonstrate the method. Your numbers replace them.

Reports and outputs

Each of these is a sheet in the workbook. They recalculate when you enter the period progress, so there is nothing to assemble at month end.

Cost forecast

  • Three EAC methods side by side
  • CPI, SPI, cost and schedule variance
  • Variance at completion and TCPI

Monte Carlo

  • 1,000 iterations, no macros
  • P50, P80 and P90 outturn cost
  • Forecast duration and delay against baseline

Earned Schedule

  • Time-based schedule performance
  • Forecast completion date
  • Stays honest late in the job, unlike SPI

Cash flow and resources

  • Payment lag and retention modelled
  • Peak funding requirement
  • Resource forecast by period

Productivity

  • Trend against planned rate
  • Early warning before CPI moves

Assumptions and audit

  • Every distribution, its source and date
  • The record that defends the number

Power T&D questions

Yes, each with its own date, duration and the scope allocated to it, so a missed window shows its knock-on immediately.
LD exposure is calculated from the P80 connection date against the contractual date, so it moves as the forecast moves.
As external dependencies with their own duration distributions, since they are not resource-driven and cannot be accelerated.
Yes. Voltage levels and cost codes are configurable; the dependency structure is identical.

Other industry editions

NuclearMulti-decade, regulator-gated ConstructionNEC4 valuation cycles Data CentresCost per MW, long-leads AirportsNight possessions, live ops OffshoreVessel rates, weather windows RailPossessions, GRIP/PACE stages Power T&DOutages, connections, consents Energy GenerationEscalation, grid dependency

Forecast power t&d with numbers you can defend

Power T&D Edition £349, all eight editions £999, complete suite £1,399