What Whiffle does

Whiffle B.V. is a Delft-based private weather technology company founded in 2015 as a spin-out from Delft University of Technology by Professor Harm Jonker and Dr. Remco Verzijlbergh. The company builds GRASP (GPU-Resident Atmospheric Simulation Platform), a proprietary Large Eddy Simulation (LES) weather model that runs on GPU infrastructure (including consumer NVIDIA chips) and delivers sub-100m resolution atmospheric forecasts, compared to ~10km for traditional numerical weather prediction. Its portfolio comprises three core products: Whiffle Atlas (a validated 21-year mesoscale wind dataset at 2km resolution used for MCP and site screening), Whiffle Wind (a self-serve web application for LES-based wind resource and energy yield modeling at sub-100m resolution), and Whiffle Forecast (operational wind and solar power production forecasting delivered via REST API). Outputs integrate directly with industry-standard tools such as WindPRO and OpenWind, and are accessible through a Python SDK.

Whiffle monetizes through a hybrid of usage-based pricing (per simulation run for Whiffle Wind, per site for Whiffle Atlas), enterprise subscriptions for Whiffle Forecast, software licensing of GRASP to enterprise customers (Shell, Pondera), and tailored consultancy services for large simulation domains. The go-to-market combines product-led growth via the whiffle.cloud self-serve portal with enterprise field sales for Joint Development Agreements and licensing contracts. The customer base spans renewable energy developers and operators (GE Renewable Energy, RWE, Ørsted, Atlantic Shores), integrated energy majors (Shell, TotalEnergies via its accelerator program), Dutch utilities (Eneco, Essent, Outsmart, Gemini, Groendus), renewable consultancies (Pondera, Aeris), and software partners (Vind AI), with geographic reach across Europe, the United States, Australia, Korea, and Japan. Reported performance benchmarks include up to 30% lower RMSE versus ECMWF for power production forecasts, ~2% mean error in AEP predictions, and validation against 170+ sites and 300+ measurement locations.

Following a €3 million seed round from ENERGIIQ and SHIFT Invest in February 2022, Whiffle has scaled to 30+ employees, reorganized its leadership in 2024 (Remco Verzijlbergh from CTO to CEO, Harm Jonker to Chief Innovation Officer, Thijs van Winden as new CTO), and added supervisory board members with energy and digital transformation backgrounds (Kuldip Singh as Chairman, Elisabeth Stevens of Sunrock). The company holds ISO 9001 and ISO 27001 certifications, operates from Molengraaffsingel 8 in Delft, and continues to participate in R&D consortia with TU Delft, KNMI, TNO, and industry partners (WINS50, AeroLES).

Name

Whiffle

Legal name

Whiffle B.V.

Website

https://whiffle.nl

Company type

Private

Founded year

2015

Operating status

Operating

Headcount range

11–50 employees

Short description

Whiffle is a Delft-based weather technology company that provides GPU-powered Large Eddy Simulation forecasts and validated mesoscale datasets for renewable energy developers, operators, traders, and consultancies across Europe, the US, and Asia Pacific.

Ownership category

akta.pro rank

Product category

Precision Weather Forecasting Software

NAICS

Computer Systems Design and Related Services (54151), Computer Systems Design and Related Services (5415)

SIC

Services-Commercial Physical & Biological Research (8731), Services-Computer Programming Services (7371)

akta.pro primary industry

Wind Resource Assessment & Energy Yield Analytics (Met Masts, LiDAR, Modeling) (EUAMACAJ)

akta.pro secondary industry

Advanced Wind Technology R&D (Floating Offshore, Airborne Wind, New Rotor/Blade Concepts) (EUAMAOAB)

Keywords

• Precision weather forecasting
• Wind resource modelling
• Large eddy simulation
• Renewable energy forecasting
• Atmospheric simulation software

Headquarters

HQ city

Delft

HQ country

Netherlands

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

Personnel, Technology or R&D, Infrastructure, Marketing or Sales, Operations

Revenue model

1. Whiffle Wind - Software Subscription / Pay-Per-Run: Whiffle Wind is priced on a pay-per-run basis depending on domain size (small, medium, large). Users pay per simulation run for statistics or time series outputs. A 30-day free trial is available with one free statistics or time series simulation. Pricing ranges from €940 (small domain) to €9,399 (large domain) per statistics run.
2. Whiffle Atlas - Per-Site Download / Subscription: Whiffle Atlas provides instant downloads of validated mesoscale wind data. Users get 5 free downloads during trial. After trial, pricing is €450 per site download, with discounted bulk tile packs and flat-rate regional access available. Custom pricing for large portfolios.
3. Whiffle Forecast - Subscription: Whiffle Forecast offers wind and solar power production forecasts tailored to client assets. Delivered via API with options for trial or full subscription. Clients can start with a live trial for a subset of their portfolio, then onboard their full portfolio under a subscription model.
4. GRASP Software Licensing: Whiffle licenses its GRASP (GPU-Resident Atmospheric Simulation Platform) software to enterprise clients. Shell entered a two-year joint development agreement with Whiffle and received GRASP licenses. Pondera signed a separate licensing agreement to use GRASP for advanced wind flow modelling.
5. Consultancy Services: Whiffle offers tailored consultancy services for larger or unique projects, including simulations for wind farm zones up to 200km x 200km. Consultancy delivers comprehensive wind resource assessment reports or raw data customized to project needs.

Pricing tiers

Go-to-market motion3 records

Distribution channels6 records

Marketing channels9 records

Core offering

Whiffle provides precision weather forecasts and atmospheric simulations on a hyper-local scale using its proprietary Large Eddy Simulation (LES) model running on GPU infrastructure. The company sells three core software products: Whiffle Wind (LES-based wind resource and energy yield modelling web application), Whiffle Atlas (validated 21-year mesoscale wind dataset), and Whiffle Forecast (precision weather and power production forecasting delivered via API). It also licenses its GRASP simulation platform to enterprise clients and offers tailored consultancy for large-scale simulation projects.

Product overview

Whiffle offers a suite of precision weather forecasting and simulation products built on AI-optimized Large Eddy Simulation (LES) technology. The product portfolio consists of three core offerings: Whiffle Atlas (validated long-term mesoscale data for MCP and site screening), Whiffle Wind (LES-powered wind resource and energy yield modeling via web application), and Whiffle Forecast (operational weather and power production forecasting for trading and portfolio management). All products are powered by Whiffle's GRASP (GPU-Resident Atmospheric Simulation Platform) technology, which delivers hyper-local forecasts at sub-100m resolution. Products are accessible via web interface, REST API, and Python SDK, with outputs compatible with industry-standard tools like WindPRO and OpenWind.

Differentiator

Problem solved

Functional benefit

Brands

• Whiffle Wind: Web application for LES-based wind resource and energy yield modelling with ultra-high resolution atmospheric simulations
• Whiffle Forecast
• Whiffle Atlas
• GRASP

Products and services

• Whiffle Wind Online application for modelling wind resource and expected energy yield for onshore and offshore projects using atmospheric Large Eddy Simulation (LES) at sub-100m resolution. Delivers Wind Resource Grids (WRGs) and 10-minute averaged time series that integrate directly into existing workflows via WindPRO and OpenWind. Priced on a pay-per-run basis from €940 (small domain) to €9,399 (large domain) per statistics run, with a 30-day free trial.
• Whiffle Atlas A validated, precomputed mesoscale dataset providing 21-year hourly wind time series at 2 km resolution across 10 heights (2-500m). Built for MCP workflows and early-stage site screening, it offers instant downloads in CSV or NetCDF format and is validated against 300+ met masts globally. Priced at €450 per site download with a free trial of 5 downloads.
• Whiffle Forecast Precision weather forecasting tailored to wind and solar portfolio needs using advanced LES technology and machine learning. Provides meteo forecasts, LES forecasts, wind power forecasts, and solar power forecasts with up to 30% lower RMSE compared to standard weather models. Forecast horizon up to 7 days ahead with intraday updates. Delivered via REST API on a subscription model.
• GRASP (GPU-Resident Atmospheric Simulation Platform) Whiffle's proprietary atmospheric simulation software that runs Large Eddy Simulation (LES) weather simulations on Graphics Processing Units (GPUs), enabling ultra-high-resolution meteorological studies at unmatched computational speed. Licensed to enterprise clients under Joint Development Agreements and formal licensing contracts for in-house use.

Quantifiable outcome

• Up to 30% lower RMSE compared to ECMWF for wind and solar power production forecasts
• +6 more outcomes

Named customers14 records

Segments6 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Integration3 records

AI capability2 records

Feature5 records

Partnerships

13 partnerships are on record, tiered core and minor.

• RWEcoreStrategic or Co-development Partner · 1 January 2024RWE and Whiffle completed a landmark validation study benchmarking Whiffle's meso-scale model and LES against real-world measurements across 170 sites and 300+ measurement locations with 170 years of LES simulation data. RWE also adopted Whiffle Atlas for MCP and site screening workflows. Plans for a follow-up validation study on cross-prediction capabilities are underway.
• ØrstedcoreStrategic or Co-development Partner · 1 January 2024Ørsted entered a Joint Development Agreement with Whiffle to enhance onshore wind flow modelling capabilities using Whiffle's LES technology. The partnership focuses on applying ultra-high-resolution atmospheric simulations to optimize Ørsted's onshore wind projects.
• TotalEnergiesminorGTM or Marketing Partner · 1 January 2024Whiffle joined TotalEnergies' 'TotalEnergies On!' startup accelerator program dedicated to electricity business innovation. The program offers entrepreneurial support, preferential access to TotalEnergies' teams and infrastructure, trial opportunities within TotalEnergies' businesses, and hosting at STATION F (world's largest startup campus).
• AWS (Amazon Web Services)coreTechnology or Integration · 1 January 2024Whiffle collaborated with AWS on HPC blog content and uses AWS cloud infrastructure for large-scale simulations. Whiffle's GPU-based LES model leverages AWS cloud clusters for wind energy simulation workloads.
• LuxProvidecoreTechnology or Integration · 1 January 2023Whiffle partnered with LuxProvide to leverage the MeluXina supercomputer for large-scale LES simulations. The collaboration enables Whiffle to run simulations over domains up to 200km x 200km using multi-GPU computing (8 x A100, 40GB GPUs on AWS cloud cluster), dramatically expanding computational capacity for multi-gigawatt wind farm assessments.
• KNMIminorStrategic or Co-development Partner · 1 January 2023Whiffle participates in the WINS50 Project alongside KNMI and TU Delft, an RVO-funded research project aimed at reducing uncertainties around offshore wind energy deployment and its interactions with the atmosphere.
• RVOminorStrategic or Co-development Partner · 1 January 2023RVO (Netherlands Enterprise Agency) funded the WINS50 research project involving Whiffle, KNMI, and TU Delft, focused on offshore wind energy and atmospheric interactions.
• TU DelftcoreStrategic or Co-development Partner · 1 January 2023Whiffle was founded as a spin-out of TU Delft. Ongoing research collaboration with TU Delft continues, including participation in the WINS50 project. Co-founders Harm Jonker and Remco Verzijlbergh maintain academic affiliations with the university.
• TNOcoreStrategic or Co-development Partner · 1 January 2022TNO and Whiffle collaborated on the AeroLES project to develop and validate new computational methods for modelling wind turbine behaviour under real atmospheric conditions. The consortium also included GE Wind Energy GmbH. The research combined Whiffle's atmospheric models with TNO's wind turbine aerodynamics models, validated against real measurements at a ridge in Germany, plain in the Netherlands, and North Sea.
• InnovationQuarterminorGTM or Marketing Partner · 1 January 2022InnovationQuarter supported Whiffle through internationalization and market exploration programs, helping the company enter new markets and connect with relevant partners in the Netherlands and internationally.
• GE Renewable EnergycoreStrategic or Co-development Partner · 22 July 2021GE Renewable Energy entered a Joint Development Agreement (JDA) with Whiffle in July 2021 to apply Whiffle's ultra-fine atmospheric LES modelling for GE's wind energy applications. Whiffle's technology is used to optimize wind turbine siting and enable improved Annual Energy Production (AEP) for GE's global onshore wind customers. GE was recognized by ACPA as the top wind turbine manufacturer in the US in 2020, the third year in a row.
• ShellcoreStrategic or Co-development Partner · 1 October 2019Shell entered a two-year Joint Development Agreement with Whiffle and received licenses for Whiffle's GRASP software. Shell uses Whiffle's technology to optimize wind and solar energy modelling capabilities, improve Annual Energy Production predictions, and optimize wind turbine and solar panel layout. Erik van Iperen (GM Renewable Power Generation Technology) stated Shell aims to be at the forefront of wind and solar resource modelling.
• PonderacoreOEM/ Whitelabel/ Licensing Partner · 1 January 2018Pondera signed a licensing agreement with Whiffle to use GRASP software for advanced wind flow modelling. Previously collaborated on the Hollandse Kust (noord) project for RVO in 2018. Pondera uses Whiffle's LES model to model complex wind phenomena including wake effects, land-sea interactions, building/vegetation impacts, and wave effects for renewable energy consultancy clients.

Scale indicators8 records

Recent moves8 records

Expansion highlights6 records

Direct peers

• StormGeo: Norwegian provider of weather intelligence for energy markets, including wind and solar power forecasting. Direct competitor in power trading and renewable portfolio forecasting, with overlapping enterprise customer profile.
• EMD International: Danish developer of WindPRO, the industry-standard wind resource assessment and energy yield software tool. Direct competitor in wind resource workflows and a Whiffle integration partner, making it the most direct software-product comparable.
• Meteoblue: Swiss-based high-resolution weather forecasting service offering historical, current, and forecast data with strong European coverage. Comparable in delivering precision weather data with NWP-model heritage, serving similar developer and energy-trader customers.
• Vortex: Spanish company providing high-resolution weather, climate, and renewable energy data, including wind resource assessment and power production forecasting. Most direct comparable to Whiffle across all three product lines (Atlas, Wind, Forecast).
• energy & meteo system: German provider of wind and solar power forecasts, grid feed-in forecasts, and energy meteorological services. Direct competitor in renewable energy weather forecasting and a comparable scale-up in Whiffle's core market.

Broad incumbents

• DNV: Global assurance and certification firm with deep renewable energy practice including wind resource assessment, due diligence, and energy yield studies. Overlaps with Whiffle in pre-construction wind resource services, though DNV operates as a much broader portfolio.
• OpenWeather: Global weather data API provider serving enterprise customers with forecasts, historical data, and energy-specific endpoints. Broader incumbent with API-first model comparable to Whiffle Forecast delivery, though at lower resolution.
• DTN: Large US-based weather data and analytics provider with dedicated renewable energy forecasting offerings. Broader portfolio spanning agriculture, energy, and commodities but overlapping with Whiffle in wind/solar forecasting.

Emerging players

• Tomorrow.io: US-based weather intelligence platform with proprietary satellite constellation and high-resolution forecasting APIs. Emerging competitor targeting enterprise weather with similar technology-forward, API-first model.
• Vind AI: Early-stage digital platform for wind farm design and assessment that has partnered with Whiffle to integrate LES modeling. Emerging player focused on early-stage wind project optimization, adjacent rather than directly competitive.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/whiffle

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 records

Funding overview

Funding rounds2 records

Investors3 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Whiffle