Performance trend
Production and power curves are tracked year by year to measure any decline from blade wear, component ageing, or control changes.
Repowering and life extension
Run on, extend, or repower? Decide with the old fleet's own data.
Older wind farms hold years of SCADA history. This assessment uses it to measure how the existing turbines are really performing, then compares the energy, P50, and P90 of each option: continuing as is, extending life, partially repowering, or fully repowering.
Old-fleet SCADAperformance and ageing
Scenario P50 / P90for every option
Energy upliftagainst the baseline
Step 1: How are the old turbines really performing?
Before comparing options, the baseline has to be right. The existing fleet's SCADA or DGR data shows what the site actually delivers today, and how fast it is declining.
Availability and failures
Downtime is broken down by turbine and cause, showing whether failures are becoming more frequent and which machines drive the losses.
Weak and strong positions
Turbine-by-turbine results show which positions perform best. That matters when deciding which turbines to replace first.
Run-on baseline
A forward P50 and P90 for keeping the existing turbines, with ageing losses and rising downtime applied explicitly.
Step 2: Compare the options
The old fleet's record is used to calibrate the wind climate and wake model, so every scenario starts from measured site behaviour rather than a desktop estimate.
| Scenario | What changes | What the assessment reports |
|---|---|---|
| Run on | Existing turbines continue with normal maintenance | Forward P50/P90 with ageing and availability decline |
| Life extension | Refurbishment of key components to keep the fleet running longer | Recovered availability and performance, and the energy over the extended life |
| Partial repowering | The weakest or best-sited positions are replaced; the rest run on | Combined P50/P90, including wake between new and old turbines |
| Full repowering | A new layout with modern turbines on taller towers | New-layout P50/P90, hub-height shear, wake, and IEC 61400-1 suitability |
What you receive
- SCADA performance review of the existing fleet, turbine by turbine.
- Run-on baseline P50 and P90.
- P50 and P90 for each repowering or life extension scenario, on 1-year and multi-year bases.
- Energy uplift of each scenario against the baseline, with its uncertainty.
- Notes on the inputs that most affect the decision: hub-height shear, neighbour wake, grid capacity, and land constraints.
- Spreadsheet outputs for the investment model.
Frequently asked questions
Our SCADA data is incomplete. Can it still be used?
Usually, yes. Older sites often have gaps, missing channels, or only DGR data. The assessment uses what is reliable, documents what is excluded, and widens the uncertainty where the data is weak.
Do we need new wind measurements before repowering?
For the new hub height, a tall mast or LiDAR campaign is strongly recommended, because old turbines measure the wind far below modern hub heights. The old-fleet data then anchors the long-term wind climate.
How is wake handled when only some turbines are replaced?
Old and new turbines are modelled together, because large new rotors change the wake that the remaining old turbines receive, and the old turbines affect the new ones.
Can you assess the remaining structural life of the turbines?
The assessment covers energy and performance. Structural and load-based life assessment is specialist work by the OEM or a certification body; the SCADA and wind-climate results can be supplied as inputs to it.
Is the result suitable for lenders?
Yes. Each scenario is reported with its uncertainty budget and assumptions documented, so it can support financing of the repowering or life extension project.
Weighing up an older wind farm?
Share the turbine type, years of SCADA or DGR data, and the options you are considering, and a scoping call will set out the assessment and a fixed fee.