A red-and-white guyed lattice met mast standing alone in open grassland under a wide sky

Service 01 — Wind resource assessment

First, know the wind.

The measured foundation every wind project is financed on. IEC-compliant met-mast and LiDAR campaigns that characterise the wind at hub height — and produce datasets that survive independent review.

Scope a campaign What you get

Continuous measurement · IEC 61400-50 · masts to 170 m

7.7 m/s Mean wind · 100 m · real 12 months
0.21 Shear α · 10 → 100 m
2.1 Weibull k · steadiness
1.16 kg/m³ Air density · at the compound
Real 12 months · hourly ERA5
anonymised upland site

12 months · distilled

NESW
Dominant sector
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Strongest month
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Calm ‹ 3 m/s
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Reference readout · loading 12 months of real wind …
Siemens Gamesa ReNew Adani DNV Vestas Greenko Engie Azure Power Suzlon Tata Power CleanMax AMPYR Deutsche WindGuard JSW Energy GE Enel Vena Energy EDF Inox Wind BrightNight UL Solutions Hero Future Energies Acciona Energía Envision BluPine Energy Torrent Power Juniper Green Energy Alfanar Senvion Blueleaf Energy Vibrant Energy Zelestra NISE Hinduja Renewables Sprng Energy AMPIN Energy UPC Renewables Levanta Renewables Solarpack Fourth Partner Energy WEG
200+Measurement campaigns
120+Masts maintained
16Countries
170 mGuyed lattice, to 170 m
2016Independent since
Live tool · free · no email

Read your site’s wind right now.

Drop your site coordinates and we pull the current model wind for that exact point — hub-height speed, direction, gust, shear, air density and the week ahead, each explained below its number.

Enter a site — or press Read with the sample 10.77, 77.05

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–Wind · 120 m · m/sModel wind at the picked height — 120 m is roughly where a modern rotor centre sits
–Direction · coming fromWhere the wind arrives from — the axis a farm layout must respect
–Gust · 10 m · m/sStrongest gust near the ground — the loads side of the story
–Shear α · 10 → 120 mHow wind grows with height (power law). ~0.1 open sea · ~0.2 farmland · 0.3+ rough terrain
–Air density · kg/m³From temperature & pressure — energy scales with ρv³, so thin air pays less
–5-day mean · 120 m · m/sMean of the model hours ahead — a first hint, never a resource estimate
0510152025m/s

Model wind · Open-Meteo · not a measurement

This is model wind (Open-Meteo blended national models, ~11 km grid, hourly, nothing stored by us), not a site measurement — models smooth over hills, forests and local flow, and that error is exactly what a project can’t afford. A measurement campaign proves the number lenders accept →

02

What a wind resource assessment decides.

Four numbers in a wind project are priced from the measured wind. Get the wind wrong at the start and every one of them is wrong after it.

  1. 01 · Yield

    How much energy the site will make

    The P50 annual energy estimate. Every revenue line in the model starts here.

    From: hub-height wind speed · direction · air density
  2. 02 · Debt

    How much a lender will finance

    Banks size debt on P90, the conservative case. Lower measurement uncertainty moves P90 towards P50: roughly 1.3 % more bankable energy for every 1 % of uncertainty removed.

    From: measurement uncertainty · long-term correlation (MCP)
  3. 03 · Turbine

    Which machine, at which hub height

    Shear and turbulence set the IEC class the turbine must be certified for, and whether a taller tower pays for itself.

    From: shear α · turbulence intensity · extreme gusts
  4. 04 · Tariff

    What price the power can be sold at

    A PPA or auction bid is a bet on yield certainty. The narrower the uncertainty, the lower the bid can go and still be financed.

    From: P50 / P90 spread · seasonal profile

Why we measure at hub height, not at the ground

Wind gets faster with height, and energy goes with the cube of speed. A public model or a 10 m weather station reads the ground; the rotor lives 60–170 m up. The gap between the two is the reason a mast or LiDAR campaign exists.

0.21
Low α (0.10) = open flat land · high α (0.30) = forest, hills, stable nights
ROTOR 2001204010 HEIGHT ABOVE GROUND · m WIND SPEED · m/s → ROTOR HUB · 120 m GROUND STATION · 10 m
03

What separates a VOTC assessment

Six reasons a VOTC dataset survives the people paid to doubt it. Scan the channels — the console reads out each one.

Differentiators · channel scan 06 channels

Channel 01 / 06

Independent by design

No position in the outcome — no development stake, no turbine to sell. That is why OEMs, owners and independent engineers, parties whose interests rarely align, work from the same VOTC dataset.

One dataset · every party · no position in the outcome

04

What's included

One measurement scope, defined and signed off before any equipment is mobilised — plan, measure, process, deliver.

The measurement pipeline · two instruments, one validated dataset

Plan · 01

Campaign design

Terrain, wind and access, planned to IEC and signed off before mobilisation.

IEC 61400-12-1 · 50-1
Measure · 02

Met mast

Guyed lattice to 170 m, MEASNET-calibrated Thies First Class anemometry.

MEASNET · NABL/ILAC design →
Measure · 03

Ground LiDAR

Vaisala WindCube, ZX and Movelaser vertical profilers across the rotor.

IEC 61400-50-2 solutions →
Process · 04

Data validation & MCP

Continuous QA, anomaly recovery and long-term correlation to reference data.

Monthly QA · MCP
Deliver · 05

Bankable reporting

IEC-aligned reporting and handover dossier, ready for the lender's engineer.

IEC-aligned reporting →

Five workstreams · one scope · one contract · one accountable party

05

The deliverables dossier

Everything handed over — an auditable data room, not a slide deck.

VOTC Bankable
IE-ready

Handover dossier

Wind Resource
Assessment

Reference mast MM-01 · 170 m
10.77°N · 077.05°E

Ref · WRA-2026 08 documents IEC 61400
One document set · audited end to end
Contents08 documents · delivered
  1. D-01IEC-aligned measurement plan & site survey reportPDF
  2. D-02Mast design calculations, GA drawing & sensor layoutDWG · PDF
  3. D-03MEASNET / NABL·ILAC calibration certificates, per serial numberPDF
  4. D-04Erection log & commissioning report with hold-point recordsPDF
  5. D-05Monthly data-quality & availability reportsPDF · CSV
  6. D-06Validated dataset with documented recovery & flaggingCSV · TAB
  7. D-07Long-term correlation (MCP) analysisPDF · XLSX
  8. D-08Final bankable report & complete handover dossierPDF
06

Met mast, LiDAR, or both?

Two ways to measure the wind — point readings at fixed heights, or a continuous profile across the span. Most bankable campaigns use both.

Met mast

Reference standard
Aerial view of a tall red-and-white guyed lattice met mast standing over green farmland and forested hills, guy wires radiating to its anchors Discrete · fixed heights
  • MeasuresPoint, multi-height cup anemometry
  • HeightsFixed booms, to 170 m
  • DeployWeeks to erect · permanent
  • Best forHub-height traceability, multi-year records

Ground LiDAR

Speed & reach
A WindCube ground LiDAR standing in a field after rain, wind turbines and a rainbow behind it Continuous · full span
  • MeasuresVertical profile, full rotor span
  • HeightsTo and beyond hub height
  • DeployDays · relocatable mid-campaign
  • Best forComplex terrain, short-lead, verification

Interactive · scope it yourself

What would your turbine need?

120 m
150 m
Rotor spans45 – 195 m
Mast120 m · hub anchor
LiDARto 195 m · full span

IEC 61400-12-1 wants hub height anchored by calibrated anemometry and the rest of the swept area profiled — that pair is what lenders see. Get this exact configuration as a scoped proposal →

hub 120 m mast 120 m tip 195 m LiDAR
The answer

Both — the bankable default

Most campaigns combine them — a mast anchoring traceability, LiDAR extending it across heights and locations. VOTC delivers both under one accountable scope, so the choice is engineering, not procurement.

Anchored point + profiled span MEASNET + LiDAR cross-check The common lender-ready configuration
07

Standards & traceability

Every figure defined and available for verification — we would rather present a smaller number that survives due diligence than a larger one that does not.

An unbroken chain — every reading traced back to the metre and the second

  1. 01 On the report 7.72m/s Hub-height mean, as delivered IEC 61400-12-1
  2. 02 Instrument S/N08822 Anemometer, installed & logged IEC 61400-50-1 · 50-2
  3. 03 Calibration Certtied to serial Wind-tunnel, before deployment MEASNET
  4. 04 Accreditation NABLILAC MRA Accredited, mutually recognised ISO/IEC 17025
  5. SI Reference m& second The definition of speed itself BIPM · SI
Held unbroken by ISO 9001ISO 14001ISO 45001 Quality, environment and occupational health & safety — the management system that keeps every link auditable, from calibration certificate to installed serial number at commissioning.
08

From first call to live data

Indicative timeframes, not contractual — the shape of a typical start.

  1. Day 0You

    Share the site

    Send coordinates, project stage and the decision the data must support — a call or an email is enough to start.

  2. Week 1VOTC

    Scope & proposal

    We come back with a measurement scope, campaign design, programme and price. One document, no ambiguity about what is delivered and verified.

  3. Weeks 2–4You + VOTC

    Kick-off & engineering

    Contract, site survey, plan sign-off, mast/LiDAR engineering and calibration scheduling. Permits, export and logistics begin in parallel — handled by VOTC.

  4. DeployVOTC

    Deploy & commission

    Manufacturing, shipping, installation through hold points H1–H4, sensor commissioning and the 7-day data verification.

  5. LiveVOTC

    Live data & reporting

    Remote telemetry streams from day one; you receive monthly data-quality reports and a named point of contact for the life of the campaign.

    Reference · 7.72 m/s

Start at Step 1 today — info@votc.in →

09

Who commissions a VOTC assessment

Developers and IPPs establishing greenfield sites; asset owners extending or repowering; turbine OEMs validating siting; lenders, investors and their independent engineers verifying someone else’s numbers.

Build the case

Developers & IPPs

Financing a greenfield site — the resource has to underwrite the debt.

Turbine OEMs

Validating siting and turbine suitability against real conditions.

The shared record One dataset,
no position in the outcome Independent
Stress-test it

Lenders & independent engineers

Verifying someone else’s numbers before capital is committed.

Asset owners

Extending or repowering an operating asset with confidence.

Because VOTC holds no position in the outcome, parties whose commercial interests rarely align can work from the same record.

10

One global network, one engineering standard.

Sixteen countries, five operating regions — export, customs, permits and HSE handled end to end. One method, one record, wherever the site is.

Network · all regions · reference 16countries
GCC SOUTH ASIA SE ASIA ANZ AFRICA
5 operating regions · one method · one record — wherever the site is
  • 01India & South AsiaManufacturing, calibration and the network’s largest concentration of masts under maintenance.
  • 02Southeast Asia & the PhilippinesCampaigns in typhoon-exposed and island terrain, including remote-access sites.
  • 03Middle East & GCCTall-mast programmes in high-temperature desert conditions.
  • 04Australia & New ZealandResource assessment and LiDAR campaigns to local regulatory expectations.
  • 05Africa & Central AsiaEmerging-market campaigns, delivered to the same method and the same records as everywhere else.

The whole chain

Where is the site — and what must the data prove?

Tell us where the site is and what decision the data has to support. We come back with a measurement scope, a programme and a price.

Call +91 96503 07888 Email info@votc.in

Offices, channels & the enquiry composer →

Scope, programme & price · within about a week