In today's filing, Shawn Elicegui, a senior vice president for regulation and planning at NV Energy, said for any grandfathering plan to be accepted, it "needs not only to be fair, but, equally important, broadly perceived and accepted as fair." The development comes as the PUC prepares to hear arguments Monday about grandfathering existing rooftop solar users. At issue is a controversial decision by the PUC to increase bills for all solar customers. The decision raised a fixed service charge for solar customers and slashed the value of credits customers earn for generating excess electricity under a program known as net metering. The new rates will be phased in over four years. NV Energy initially avoided taking a formal position on the grandfathering issue, instead giving the commission seven options, some perceived to be in direct contradiction with the 20-year deferral it floated in its news release. Five options suggested expanding the transition period.