Court sides with FERC in major transmission rate case
A federal appeals court has upheld the Federal Energy Regulatory Commission’s decision to lower the return on equity for transmission owners in the Midcontinent Independent System Operator region and order refunds to ratepayers. The June ruling, reported by Utility Dive, is significant because it rejects a key utility argument that the Federal Power Act limits refunds to a single 15-month period.
At issue is how much transmission owners should be allowed to earn on their grid investments and how far back FERC can go when those returns are found to be too high. Those questions sit at the center of a broader tension in energy policy: utilities argue that strong returns help support investment in grid expansion and modernization, while consumer advocates and some regulators focus on affordability and protection from over-earning.
What the court upheld
According to the supplied source text, the U.S. Court of Appeals for the District of Columbia Circuit upheld FERC’s 2024 decision to reduce the base return on equity for MISO transmission assets to 9.98% from 10.02%, effective Sept. 28, 2016. FERC also ordered refunds to customers.
The numerical change may look small, but the legal principle is larger than the spread between those two percentages. The ruling reinforces FERC’s ability to impose multi-year refunds in cases where it determines that transmission owners have earned more than allowed. In practical terms, that gives the regulator more leverage in rate disputes that can take years to resolve.
Why this matters outside MISO
The source notes that the ruling could carry implications for Eversource Energy and other transmission owners in New England, which have challenged a separate FERC decision lowering their allowed return on equity and directing roughly $1.5 billion in refunds. Utility Dive cited Harvard Law School Electricity Law Initiative director Ari Peskoe as saying the arguments utilities used in seeking a stay of that decision were largely the same arguments the appeals court has now rejected in the MISO case.
That does not automatically settle the New England dispute, but it does reshape the legal landscape around it. When a federal appeals court affirms FERC on both the rate adjustment and the refund period, it becomes harder for similarly situated utilities to argue that the agency has exceeded its authority.
The affordability-versus-investment debate
The case lands at a time when electric systems face simultaneous pressure to replace aging infrastructure, connect new generation, and meet rising demand. Those demands typically require heavy transmission spending. Utilities and grid planners often argue that investors need predictable returns if that buildout is going to happen at the necessary scale.
At the same time, return on equity is not an abstract accounting issue. It directly affects the prices customers ultimately pay through regulated transmission rates. That is why FERC decisions in this area can resonate far beyond wholesale market specialists. Small changes in allowed returns, when applied across very large asset bases and over multi-year periods, can translate into substantial sums.
A case with long roots
The ruling is also the latest stage in a dispute that dates back more than a decade. Utility Dive said the underlying complaint was filed in November 2013 and alleged that MISO transmission owners were receiving excessive returns. The path since then has included prior FERC decisions, a 2022 appeals court ruling vacating one of them, and a revised order in 2024.
That long procedural history illustrates a recurring feature of U.S. energy regulation: the most important precedents are often set through drawn-out technical cases rather than headline-grabbing legislative fights. But once they are set, they influence billions of dollars in infrastructure economics.
What changed with this decision
The immediate effect is that FERC’s position survived judicial review in a closely watched area of utility regulation. More broadly, the decision strengthens the idea that ratepayers can be owed meaningful refunds when regulators determine that approved returns were too high for too long.
For investors, grid companies, consumer advocates, and state officials, that matters. It signals that federal courts may be willing to back a more assertive FERC when the agency is defending its authority over transmission compensation. For customers, it supports the principle that prolonged disputes do not necessarily erase the possibility of repayment.
The larger signal
The MISO case does not end the debate over how to balance affordable electricity with the need for large-scale grid investment. It does, however, clarify one point: FERC retains substantial power to revisit transmission returns and require refunds over multi-year periods. In an era of expensive grid expansion, that is a consequential regulatory signal.
This article is based on reporting by Utility Dive. Read the original article.
Originally published on utilitydive.com