Data and API changelog

Notable changes to Solcast data, algorithms, and API access.
Date Description Change to Impact
Scheduled:2024-09-03 Air Temp Output Format Data, API The Air Temp output parameter will be updated from integer values to decimal values for TMY Radiation and Weather endpoint
Scheduled:2024-05-07 Historic API Timestamp Output Format Data, API The Historic endpoints for Radiation and Weather, Rooftop PV Power and Advanced PV Power timestamp output will be in the format yyyy-MM-ddThh:mm:ss±hh:mm
2024-02-13 TMY 2023 inputs Data TMY queries now include the whole of 2023 in the input long-term timeseries when generating the synthetic TMY data.
2024-02-12 Himawari-9 cloud calibrations Data Now that Himawari-9 has been operational over East Asia and Oceania for a sufficient period, we have updated our cloud calibrations over this region. All cloud, radiation and PV power data over the region from 2022-12-13 onwards has been updated and is now more accurate.
2024-02-06 Rooftop Model Panel Backtracking Data Our Radiation and Weather model across all products now take into account backtracking of solar panels for array_type=horizontal_single_axis, which will give a more physically realistic shape to our GTI. Note that the Advanced PV Power model already includes backtracking and is not affected by this change.
2024-02-01 Improved resolution terrain elevation model Data We’ve implemented changes to our Digital Surface Model which will enable higher resolution and accuracy. We’ve migrated from Mapzen DEM to the Copernicus DEM. Results retrieved after this change should be considered higher accuracy.
2023-10-26 Improved Clearsky Model: South America Data Radiation and PV power data over South America is now more accurate.
2023-09-28 Historic Time Series (Toolkit download) Data The Historic Time Series csv files downloaded from Toolkit are now in the same format as those obtained from the Historic Time Series API endpoint.
2023-08-28 PvSyst SnowDepth Parameter API Added the SnowDepth parameter to TMY data downloads in the pvsyst+csv format|
2023-08-07 Bifacial PV Module snow modelling Data Improved Power estimates for bifacial Advanced PV Power systems during snow events.
2023-07-19 TMY P50 update Data Specialty /tmy_hourly endpoint, and Legacy TMY p50 toolkit access, now uses latest version of radiation algorithms and recent years, updated from a static snapshot dataset.
2023-07-05 Forecast DNI Data Improved bias for forecast DNI and power.
2023-06-29 Terrain Shading Data, API Providing URL parameter terrain_shading=True to API requests will apply terrain shading. See
2023-06-21 Cloud detection over snow improvement Data Improved accuracy during snow events in Historic data
2023-06-05 Dawn/dusk cloud detection update Data Improved accuracy for Live actuals near dawn/dusk, and for short-range forecasts issued around dawn/dusk.
2023-05-20 New TMY API endpoint API Probabilistic and 15min and up TMY data now available via API calls. Previously this was only available via manually using the Solcast API Toolkit. See
2023-05-10 Historic Eclipses Data Historic data now includes effects of Eclipses (note that this was already the case for Live and Forecast data).
2023-05-02 Unmetered Locations added for all products API Unmetered locations for testing and integration available for all products
2023-04-19 New Snow parameters Data, API New parameters available: snow_water_equivalent, snow_depth. See
2023-03-21 Cloud calibration update Data Improved accuracy for Live and Forecast Data, and post-2020 Historic data. We have updated our calibrations as the current generation of satellites have now been operating for several years, so more accurate calibrations are possible.
2023-01-09 Snow soiling update Data Minor improvements to snow soiling calculations.
2022-12-15 Radiation model update Data Improved bias and error for radiation and power data. See