Global Energy Monitor: Location versus Unit/Phase ID

[leostimpfle]

How does powerplantmatching decide if the pojectID refers to a plant's GEM location ID or GEM unit/phase ID?

For example, for the Staudinger power plant there are two units: The coal-fired unit has a list of GEM unit/phase IDs ('G100000109620', 'G100000109621', 'G100000109623', 'G100000109622') while the gas-fired unit is linked to the plant's GEM location ID ('L100000101908'). What is the underlying methodology for this matching?

import powerplantmatching as pm
df = pm.powerplants(from_url=True)

plant_name = 'Staudinger'
df.loc[df['Name']==plant_name, 'projectID']