(1) Except as provided in subsection (2) of this section, the Public Utility Commission may require as part of an investor-owned utility residential energy conservation program that, for dwelling owners with approved credit, the utility add to the periodic utility bill for the owner-occupied dwelling for which energy conservation measures have been provided pursuant to ORS 469.631 to 469.645 an amount agreed to between the dwelling owner and the investor-owned utility.
(2) The commission shall allow an investor-owned utility to charge or bill a dwelling owner separately from the periodic utility bill for energy conservation measures provided pursuant to ORS 469.631 to 469.645 if that utility wishes to do so.