EPT-1.5 Family

EPT-1.5 and EPT-1.5 Early are our core product offerings. EPT-1.5 provides the highest accuracy and hindcast coverage, while EPT-1.5 Early offers dissemination 2.5 hours earlier to anticipate market movements.

Each model provides:

Live Forecast data

• Global coverage at 0.081°x0.081° (approx. 9x9km) resolution

• Four daily runs (00, 06, 12, 18 UTC)

• 20-day prediction horizon

• Real-time data access via REST API or direct file access

Hindcast data

• Historical forecast data for comprehensive backtesting

• All major power markets are covered, including standard EU and US markets. Other markets are available on demand.

• Essential for performance verification and system integration

• Access via Historical Data Access page

This dual-stream approach enables both operational implementation and thorough validation of forecast capabilities.

Technical Specifications

Both EPT-1.5 and EPT-1.5 Early share the following specifications:

• Update frequency: 4 Daily Updates

• Forecast horizon: 20 days (480 hours)

• Temporal resolution: Hourly

• Spatial resolution:

  • 2220x4440 pixels

  • 0.081°x0.081° cell dimensions (approx 9km x 9km at the equator)

  • Latitudes: -89.919° to 89.919°

  • Longitudes: -179.919° to 180.0°

Available Weather Parameters

Parameter Code	API Name	Description	Units
2t	air_temperature_2m	Air temperature at 2m	Kelvin
10si	wind_speed_10m	Wind speed at 10m	m s⁻¹
10wdir	wind_direction_10m	Wind direction at 10m	Degrees true
100si	wind_speed_100m	Wind speed at 100m	m s⁻¹
100wdir	wind_direction_100m	Wind direction at 100m	Degrees true
msl	air_pressure_at_mean_sea_level	Mean sea-level pressure	Pa
ssrd	ssrd	Surface solar downward irradiance	J m⁻²
z_500	geopotential_500hpa	Geopotential at 500hPa	m² s⁻²

Note that wind direction is expressed as the direction in which the wind is blowing from as measured clockwise from true North. For example, wind blowing from the South East would have a 10wdir value of 135.0.

For information on legacy parameter naming conventions in EPT-1.5, please refer to the Legacy Naming documentation.

For most forecast parameters (non-accumulated), the value at a given timestamp (e.g., 13:00) represents the weather conditions exactly at that time. The only exception is SSRD, which reflects the total solar radiation from 12:01 to 13:00 rather than just the conditions at 13:00 — making it an accumulated parameter.

Dissemination times

For detailed dissemination times of EPT-1.5 and EPT-1.5 Early, please refer to the Dissemination Times page.