3TIER by Vaisala
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Solar Energy Project Feasibility

Prospecting & Resource Assessment

The "fuel" of a solar project is the most critical factor driving its commercial success or failure. Where is irradiance strongest? How much year-to-year power variability is expected? What are the exceedance values at the site? Without answers to these questions, it is impossible to assess a project's feasibility or manage your exposure to risk. 3TIER accurately answers these questions anywhere on Earth.

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Risk Mitigation Process

3TIER provides a systematic progression of services to help our clients manage the risk of solar resource variability.


Site Identification & Feasibility

Due Diligence & Financing

Identify the best areas for closer evaluation using quick and low cost data.

Examine and prioritize promising sites and estimate long-term power availability.

Maximize certainty in a project’s long-term performance to secure financing.


  • 3 km resolution mean data
  • Online maps
  • GIS data layers
  • API


  • 13+ years of 3 km resolution, hourly solar data
  • Wind and temperature data
  • Exceedance probability tables


  • Bankable solar resource data
  • Measurements integrated into analysis
  • Custom wind and temperature data
  • Statistically-corrected exceedance probability table

Quickly Explore Solar Resources Around the World

Save time and money by targeting the best locations for solar energy projects and infrastructure. 3TIER lets you quickly explore any location around the world directly from your computer. Now you can avoid problem sites and separate successful projects from marginal ones earlier in the process. Our on-demand, initial solar resource assessments are based on a consistent, global dataset so you can compare sites with confidence.

The First and Only Advanced Solar Dataset with Global Coverage

  • Spatial resolution of ~3 km
  • 13+ years of hourly GHI, DNI, and DIF
  • Based on over a decade of satellite data with continual updates
  • Validated and developed using widely recognized datasets worldwide
  • Multiple delivery formats

Maximize Accuracy With State-of-the-Art Science

Direct measurements are the best way to record actual solar conditions and unique, localized effects at a site. However, it takes 10+ years to capture climatic variability, which can make or break a project financially, and few measurement campaigns have records extending that far back in time. To mitigate this risk, 3TIER uses on-site measurements to correct our long-term satellite data with advanced statistical techniques. The result is significantly reduced uncertainty about future project performance and the bankable production estimates required to secure project financing.

A Trusted Name in Solar

3TIER has completed solar resource assessment in very challenging climates and for several of the largest utility-scale projects currently in development around the world. In addition, 3TIER provided resource assessments for the majority of the shortlisted project applications for the Australian Government's Solar Flagships program.

  • Performed work on all 6 continents
  • Assessed over 1.2 GW of proposed solar projects
  • Helped developers secure over $4.1 billion in solar project investment

Assessment Products

Solar Prospecting Tools

Get quick and low cost access to global solar data for vetting small solar installations and performing red flag analysis. More

Solar GIS Data Layer

Layer 3TIER solar resource datasets with transmission, land use, and other information to target promising sites across broad regions. More

Prospecting API

Integrate our resource datasets directly into your own solar applications. More

Solar Time Series

Integrate 13+ years of hourly solar data into your modeling or design software to determine long-term feasibility. More

Solar Site Climate Variability Analysis

Examine in depth irradiance analysis and information on the impact of wind speed and temperature at your location. More

Solar Site Resource Assessment

Get a bankable resource assessment calibrated with on-site measurements and custom wind and temperature data. More

View All Solar Products