Making powers not otherwise permenant, permenant...

[Zwicky]

Are there rules to cover making sustainable powers permenant?
Example: a huge alien with super dense physiology. Can you modify Growth or Density to be permenant? Maybe only a couple/few levels of each?

New to the game. Really love the ruleset. Used to play Champions in the past and found it overly complex with gamebreaking highly possible in character creation.

Thanks for the input!

Kerry
Anchorage, Alaska