§ 37-3-112 — Service to be adequate and safe; regulations to be just and reasonable; unjust discrimination or undue preference as to service prohibited

The service and facilities of every public utility shall be
adequate and safe and every service regulation shall be just and
reasonable. The commission shall have the authority to
investigate, consider and determine standards for availability
or reliability of service that are objectively established by
rule consistent with commonly accepted industry standards. It
shall be unlawful for any public utility to make or permit to
exist any unjust discrimination or undue preference with respect
to its service, facilities or service regulations. This
provision shall not be construed as prohibiting a public utility
from establishing classifications which distinguish among its
various services, facilities or service regulations if the
classifications are not unduly discriminatory among the
customers in the same class of service.