Power of electricity produced by power plants connected to the National Power Grid. Net power is the one measured at the grid connection point. It does not include the power required by power plants for their own needs.
Emissive energy sources: hard coal, lignite, natural gas, biomass, other (oil, coke-oven gas, other unspecified).
Non-emissive energy sources: onshore wind, photovoltaics, hydroelectric power plants (run-of-river, reservoir), energy storage (currently pumped storage).
The data is published by ENTSO-e, but originates from the Transmission System Operator (Polskie Sieci Elektroenergetyczne) on the basis of continuous readings of the power at which the individual units operate.