Who Regulates the Grid

Three layers of regulators touch every kilowatt-hour, and each one has a fence around what it can decide. People lose hours calling the wrong agency. The fastest test: ask whether the question is about wholesale and high-voltage (federal), reliability rules for the bulk grid (NERC), or what a retail customer pays and how the local utility behaves (state or local).

The layers

FERC

The Federal Energy Regulatory Commission is an independent agency of five commissioners. It regulates the transmission and wholesale sale of electricity in interstate commerce, approves the tariffs that run markets like the WEIM, EDAM and Markets+, licenses non-federal hydro dams, approves NERC's reliability standards and polices market manipulation. Its 2024 Order No. 1920 requires transmission providers to plan regionally at least 20 years out.

FERC's own page is blunt about what it does not do: it does not regulate retail electricity sales to consumers, approve construction of power plants, or regulate municipal utilities, federal power marketing agencies and most rural co-ops. A customer angry about their bill almost never has a FERC problem.

NERC and WECC

The North American Electric Reliability Corporation is a nonprofit that FERC certified as the Electric Reliability Organization after the Energy Policy Act of 2005 made reliability standards mandatory. NERC writes standards on things like cold-weather preparation, vegetation near transmission lines and cybersecurity. FERC approves them. NERC and six regional entities audit utilities and can levy fines. In the West, the regional entity is WECC. NERC also publishes the seasonal and long-term reliability assessments covered in lesson 8.

State commissions

The Idaho Public Utilities Commission has three commissioners appointed by the governor and confirmed by the Senate, with no more than two from the same party, serving staggered six-year terms. It regulates investor-owned utilities such as Idaho Power, Avista, Rocky Mountain Power (PacifiCorp) and Intermountain Gas. It does not regulate co-ops or city utilities. Its staff, a team of engineers, accountants and attorneys, is a party in every case and often the most informed skeptic in the room.

How a rate case works

A regulated utility gets a deal: a monopoly on its territory in exchange for letting the state set its prices. The price is supposed to cover reasonable costs plus a fair return for investors, no more. A rate case is how the commission works out that number.

The formula

Revenue requirement = Operating expenses
                    + Depreciation
                    + Taxes
                    + (Rate base x Rate of return)

Rate base is the net value of plants, lines and equipment serving customers. The rate of return blends the interest rate on the utility's debt with an allowed return on equity for shareholders. Because profit comes from rate base, an investor-owned utility earns more by building more, which is why regulators test whether each investment was prudent and "used and useful." That incentive is built into the system on purpose, and anyone weighing in on a rate case should understand it first.

Operating expenses (fuel, payroll, maintenance):  $420 million
Depreciation:                                    $110 million
Taxes:                                            $45 million
Rate base:                                     $3,000 million
Rate of return (blended debt and equity):           7.2%

Return = $3,000M x 0.072 = $216 million
Revenue requirement = 420 + 110 + 45 + 216 = $791 million

Current rates bring in $730 million.
Requested increase: 791 - 730 = $61 million, or 61 / 730 = 8.4%

The steps

1. Filing. The utility files an application, testimony from its experts and proposed new tariffs. Idaho Code 61-307 requires 30 days' notice to the commission and public before rates change, unless the commission allows otherwise for good cause.
2. Suspension and notice. The commission usually suspends the proposed rates while it reviews them. Under Idaho Code 61-622 the initial suspension is up to 30 days, extendable by up to five months, plus 60 more days for good cause. It issues a notice of application with deadlines.
3. Intervention. Groups such as large industrial customers, irrigators, consumer advocates and environmental groups petition to become intervenors.
4. Discovery. Parties send written questions (production requests) and the utility must answer. The answers are often the richest public record in the case.
5. Testimony. Staff and intervenors file their own expert testimony proposing different numbers.
6. Settlement or hearing. Many cases settle, with some or all parties agreeing to a number. The commission still has to approve it and can reject it.
7. Public comment and hearings. Customers can file written comments and speak at public hearings. These are part of the record.
8. Final order. The commission issues a written order with its reasons. Parties can ask for reconsideration and then appeal.