(c) Notwithstanding any other provision of this section, in the case
where a shared meter customer is entitled, following a final
determination of a shared meter condition, to a refund or cancellation
of shared meter charges and title to the dwelling has been transferred
to a new owner, such shared meter customer shall receive his or her
refund from the utility for charges for service measured through a
shared meter, excluding the estimated charges for service used in the
shared meter customer's dwelling, for the period of time effective six
years prior to the discovery of or determination that a shared meter
condition exists, or the first day of the tenancy, or the date the
shared meter condition began, whichever is most recent in time.
(d) The commission shall investigate whether and to what extent
refunds provided pursuant to this subdivision were made necessary by
inadequate notice to customers regarding the provisions of this section.
11. Other relief. Notwithstanding any other provision of this section,
the rights of a utility customer under this article to seek and obtain
relief for payments made for service not provided to his or her dwelling
shall not be diminished in any manner. Unless otherwise specified in
this section, the rights of a utility to collect payment for service
rendered but unpaid shall not be diminished in any manner.
12. Apportionment. The commission shall establish guidelines for
estimating the amount of utility use in other space outside the shared
meter customer's dwelling and for apportioning costs required by this
section.