Query European grid generation, load, and price data from the ENTSO-E Transparency Platform API

Steps

1. Register on the ENTSO-E Transparency Platform and request API access; upon approval you receive a security token sent to your registered email.
2. Construct GET requests to https://web-api.tp.entsoe.eu/api with required parameters: securityToken=<TOKEN>, documentType (e.g., A75 for actual generation per type), periodStart and periodEnd in UTC format YYYYMMDDHHMM, and in_Domain or out_Domain using ENTSO-E area EIC codes.
3. Parse the XML response (GL_MarketDocument or similar) using the correct namespace; extract TimeSeries elements, then Period, then Point elements with position and quantity fields, mapping positions to timestamps using the resolution and period start.
4. For day-ahead prices, use documentType=A44 with in_Domain and out_Domain set to the relevant bidding zone EIC code (e.g., 10YDE-EON------1 for Germany-TenneT).
5. Handle large time ranges by splitting requests into intervals no larger than what the API accepts per call; the maximum range varies by document type (often one year for some, one day for high-resolution data).