Energy » *Energy Cards In General
Most Special Energy cards that provide a particular energy type do not provide that type when it is in the deck, the discard pile, or in your hand. Please read the text of the Special Energy card for clarification.
Source: TPCi Rules Team (2017-07-06)
Energy » *Energy Cards In General
The [default or normal] amount of energy an Energy card provides is equal to the number of energy symbols in the upper right or left corner of the card, regardless of how many different types of energy is provided.
Source: PUI Rules Team (2004-04-08)
Energy » *Energy Cards In General
A Special Energy Card remains a Special Energy card regardless of what happens to it. A Fire Burned Rainbow Energy may only produce Fire energy but it would still be considered a Special Energy card as well.
Source: WotC Chat (2002-02-14)
Energy » *Energy Cards In General
Any card that provides Energy is considered an Energy card of the type it provides. So if you were to Energy Burn a DCE, it counts as a Fire Energy card that provides 2 fire Energy until the end of the turn. So it could be Gathered by Team Rocket Charmander but would only provide 1 coin flip for the Continuous Fireball attack on Dark Charizard.
Source: WotC Chat (2000-07-06)
Energy » *Energy Cards In General
If a card gives off Energy of any type then that card COUNTS as an Energy card of that type. This means a Buzzap'd Electrode that was chosen to give 2 Grass Energy COUNTS as a Grass Energy Card and can be Energy Transferred by Venusaur's Pokémon Power.
Source: WotC Chat (2000-03-30)