December 9, 2025

A practical guide to improving utility-scale & rooftop forecasts with site measurements

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A practical guide to improving utility-scale & rooftop forecasts with site measurements

Harry Woods

December 9, 2025

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How can site measurements improve your PV power forecasts?

PV forecast accuracy is critical for solar operators, whether managing utility-scale assets or residential rooftop systems. The quality of your power forecasts depends not just on the accuracy of your weather forecast - but also the quality and ccuracy of your power model.

Physical power models can deliver relatively high accuracy using limited data, but if you have access to quality site power measurements, tuning your power model can improve the quality of your results.

After nearly a decade working with over 600 customers managing 650GW of assets globally, the Solcast team has fine-tuned its PV power models to meet the evolving needs of the solar industry. Here are the lessons we have learnt along the way.

Download the guide Instant access, no form to fill

What's inside the guide?

  • How site measurements can turn good forecasts into great ones
  • How tuning bridges the gap between theoretical models and real-world performance
  • How data quality and consistency impact the accuracy of your forecasts
Download the guide Instant access, no form to fill

The Solcast API now issues forecast data for tens of thousands of rooftop and utility-scale assets every 5 to 15 minutes worldwide.

Start evaluating our data via the Solcast API, or reach out to our team to learn more.

A practical guide to improving utility-scale & rooftop forecasts with site measurements

Harry Woods

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Head Of Marketing

Harry is our Head of Marketing, and works with our customers and industry partners to discover and share the new and innovative applications of Solcast data that are being built every day inside the Solar Industry. He holds a Bachelor of Laws and Bachelor of Arts and has experience in Go-To-Market working with complex enterprise grade technology solutions ranging from Ethical AI to Telecommunications.

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