(untested) Try this:
utility_meter: !include_dir_named utlity_meter
where “utlity_meter” contains tree-like structure of folders & files, each may contain several entries or just one entry:
energy_1:
source: ..
cycle: ...
energy_2:
source: ...
cycle: ...
(imho, this way of using packages should be for a whole config, not utility_meter only, described here)