MN HF158

Changes interim rate authorization from mandatory ("shall") to discretionary ("may") for the Public Utilities Commission, allowing interim rates to be ordered no later than 60 days after initial filing.

Requires the Commission to find that "an immediate and compelling necessity exists for an interim rate increase" before authorizing any interim rate schedule, replacing the previous ex parte process without public hearing requirement.

Modifies interim rate calculation standards to allow revenue increases deemed necessary to prevent injury to the public or utility (not exceeding utility's request), with rate of return on common equity capped at the amount authorized in the utility's most recent rate proceeding.

Maintains refund requirements when interim rates exceed final determination rates, with refunds due within 120 days plus interest, and allows utilities to recover revenue differences when interim rates are less than final rates.

Adds a four-month waiting period before ordering interim rates in general rate cases following a previous rate change, with exceptions for unreasonable burden on utility, customers, or shareholders, or when a utility files a second general rate case at least 12 months after a previous filing with extended suspension.