If Dusknoir’s “Spectral Breach” Ability is active, does Double Colorless Energy provide one energy or two?
It would only provide one {C} Energy.
Source: Vivid Voltage FAQ (2020-10-31), TPCi Rules Team (2020-11-12)

Relevant cards

Note: All applicable cards may not be listed below.
SWSH4_71
SWSH4_71