§ 37-3-101 — Rates to be just, reasonable and uniform; exceptions

All rates shall be just and reasonable, and all unjust and
unreasonable rates are prohibited. A rate shall not be
considered unjust or unreasonable on the basis that it is
innovative in form or in substance, that it takes into
consideration competitive marketplace elements or that it
provides for incentives to a public utility. Except as otherwise
provided in W.S. 15-7-407, no public utility shall in any manner
charge, demand, collect or receive from any person greater or
less or different compensation for any service rendered or to be
rendered by the public utility than is charged, demanded,
collected or received by the public utility from any other
person for a like and contemporaneous service under similar
circumstances and conditions. The commission may determine that
rates for the same service may vary depending on cost, the
competitive marketplace, the need for universally available and
affordable service, the need for contribution to the joint and
common costs of the public utility, volume and other discounts,
and other reasonable business practices. Nothing in this title
shall prohibit any public utility from furnishing free or
reduced rate service to its current or pensioned employees and
dependent family members under rates approved by the commission.