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Utility Scale Solar

Anywhere in the world, updated every 10-15 minutes based on real cloud tracking. Learns from your measured data to improve the forecast. Includes live accuracy tracking.

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Data Specifications

Formats available




  • PV Power (MW)


  • Global Horizontal Irradiance (GHI)
  • Direct Normal Irradiance (DNI)
  • Diffuse Horizontal Irradiance (DIF, DHI)
  • Cloud Opacity
  • Temperature
  • Solar zenith angle
  • Solar azimuth angle

Forecast probabilities

10th and 90th percentile forecasts provided for:

  • PV Power (MW)
  • Global Horizontal Irradiance (GHI)
  • Direct Normal Irradiance (DNI)

Spatial coverage

All continents (Rapid update actuals and forecast data) Global (forecasts)

Time granularity

Standard (Rapid Update): 5, 10, 15, 20 or 30 minutes (period mean)

Super Rapid Update: 1 minute

Update frequency

Standard (Rapid Update): Every 10 or 15 minutes

Super Rapid Update: 1 minute

Time span (Forecast)

Present time to +7 days ahead

Time span (Realtime)

7 days ago to present time

Power Modelling - Included metadata options

Maximum installed capacity


Tracking systems supported?


Minimum metadata you need to provide

latitude, longitude (and MWac capacity, if you don’t upload or post your measurements)

Additional metadata you can share for a better forecast

azimuth, tilt, AC capacity, DC capacity, tracking type, loss factor, install date

Multiple tilts/tracks supported?

Yes – via separate posting/requests, then add results

Additional metadata you can share to enable a better forecast

AC and DC capacity, azimuth, tilt, loss factor and install date

Power modelling - Included tuning options

Detects your site specifications from measured data?


Learns about shading, slope and other site-specific factors?


Minimum period of measurement data required to start improving your forecast with tuning

6 weeks (12 months is ideal)

Minimum measured data parameters we require

Total power output (MW)

Additional measured data parameters you can post for a better forecast

Current availability (% of AC capacity) Site-mean GHI radiation (W/m2) Network constraint flag (Boolean) Network constraint value (MW)

Allowable time granularity of your measured data

One-off historical upload:

  • 1 to 30 minutes (5 minute means every 5 minutes is ideal)

Live data posting to Solcast API:

  • 15 seconds to 30 minutes (1 minute means every 1 minute is ideal)

Automated HTTP post of live or recent measured data to our API, for continuously updated tuning and live accuracy tracking?


Privacy agreement for your measurement data?


Ability to permanently delete your measurement data?


  • Extended Evaluation Period
  • Welcome, early adopters!

    You are welcome to try all the features of the Solcast API in an extended Evaluation Mode until approximately March 2019. This includes the ability to add 1x new site, access Live and Forecast data, and download our ‘Recent’ historical data.

  • What happens in March 2019?

    At that time, if you wish to continue use of a priced product, you can choose to enter your credit card details and begin a 14 day free trial.

    If you’re a home hobbyist, a student or a public researcher then see our free offers, or contact us.

    If you’re a corporate customer, you can also contact us about our Enterprise Solutions.

  • Rapid Update Forecasts (USD)
  • Free trial:

    A single site is free to trial for one month

  • First 5 sites:


  • 6 or more sites:


  • API calls:

    100 API calls per site per day included.

  • Large numbers of sites:

    Contact Us to discuss options

  • Self service only

    Prices listed here are for web self-service only.

    If you are interested in receiving any of the following additional services, contact us or speak to one of our Enterprise Partners to discuss options:

    • Bespoke, edited or physically signed contracts
    • Ability to licence or re-sell our data
    • A service level agreement defining service levels and response times
    • 24/7 support services, including telephone support
    • Packages including general (non-renewables related) weather services
    • Accuracy guarantees
    • Special consulting projects requiring additional services or report writing
  • Super Rapid Update Forecasts
  • For situations where the first 1 to 15 minutes of the forecast are critical

    Utilises a mix of plant SCADA measurements and sky imager forecasts

  • Pricing:

    Contact Us to discuss the needs of your site(s). Solcast or one of our Enterprise Partners will be happy to assist you.

Frequently Asked Questions

Does your utility scale solar farm forecasting API also deliver solar radiation and weather variables?

Access to our solar radiation forecasting and estimated actuals API is included with the purchase of this product.

Is live POSTing of my SCADA data required for me to utilise this product?

No. We can tune your forecasts with regular updates of your measurement (SCADA) data.

How accurate are your forecasts?

Forecast accuracy depends on many factors, so we provide our customers with live-updating accuracy tracking to ensure transparency.