Queries using the EntsoePandasClient expecting yearly data return empty dataframes

[badrbmb]

I believe a recent change is breaking queries returning yearly data like client.query_installed_generation_capacity(country_code, start, end, psr_type=None)

example to recreate issue:

from entsoe import EntsoePandasClient
import pandas as pd


client = EntsoePandasClient(api_key=API_KEY)

start = pd.Timestamp('20171201', tz='Europe/Brussels')
end = pd.Timestamp('20180101', tz='Europe/Brussels')
country_code = "BE"

client.query_installed_generation_capacity(
    country_code=country_code, start=start, end=end, psr_type="B01"
)

Expected result:

  Biomass
2017-01-01 00:00:00+01:00    598.0

Returned results:

Empty DataFrame
Columns: [Biomass]
Index: []

Originally posted by @badrbmb in #287 (comment)

[badrbmb]

Unless the expected behavior when you pass less than 1 year between start and end is to indeed return an empty df? (this is the readme example above)

[tjader]

I'm pretty sure fix in this commit: 494e386 is the culprit.

You also get empty dataframes if you query sparse endpoints (like query_installed_generation_capacity) over multiple years, but using a different tz info than the output.

Reverting back to 0.6.1 works for me at the moment.