Ari Peskoe

Ari Peskoe

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Director, Harvard Electricity Law Initiative; US power markets, FERC and transmission

PJM Lacks Authority Over Line Ratings, Utilities Hold Power
SocialMar 13, 2026

PJM Lacks Authority Over Line Ratings, Utilities Hold Power

PJM has no authority over transmission line ratings. This is a governance and regulatory failure. PJM is now technically able to use more accurate inputs in its transmission system models, but it might not actually be doing so. It's up to...

By Ari Peskoe
Developer Exposes Duke's Anti‑competitive Scheme Blocking Municipal Contract
SocialMar 9, 2026

Developer Exposes Duke's Anti‑competitive Scheme Blocking Municipal Contract

In this case, a power plant developer provided evidence of Duke's "multi-faceted anti-competitive scheme" to prevent the developer from winning a contract with a municipal utility that had purchased power from Duke.

By Ari Peskoe
President Calls Out Big Tech's PR Crisis
SocialMar 4, 2026

President Calls Out Big Tech's PR Crisis

In case you're not watching today's press conference on the "ratepayer protection pledge," the President said this is why they've convened today:

By Ari Peskoe
FERC Scrutinizes PSE&G Rates After Faulty PJM Data
SocialMar 4, 2026

FERC Scrutinizes PSE&G Rates After Faulty PJM Data

I filed a comment @FERC in a proceeding about PSE&G's transmission rates. In 2024, FERC found that PSE&G provided faulty info to PJM in a process that led PJM to designate PSE&G as developer of a $546M transmission project. FERC decide...

By Ari Peskoe
FERC eLibrary Outage Affecting some Users
SocialMar 2, 2026

FERC eLibrary Outage Affecting some Users

Maybe not the most urgent issue, but @FERC eLibrary is down (at least for me).

By Ari Peskoe
FERC Admits Misvaluation, yet Status Quo Persists
SocialFeb 25, 2026

FERC Admits Misvaluation, yet Status Quo Persists

FERC finds that setting min. stds for interregional transmission capacity "can inaccurately value interregional transfer capability." OK. But the status quo is definitely inaccurately valuing interregional transfer capability. Nothing will change. FERC missed an opportunity.

By Ari Peskoe
State Laws, Not President, Govern Facility Power Plant Decisions
SocialFeb 25, 2026

State Laws, Not President, Govern Facility Power Plant Decisions

State laws decide whether industrial computing facilities can build their own power plants. The President can't change those laws. That said, I appreciate that the 'pledge' is about 'ratepayers' and not customers.

By Ari Peskoe
Conservatives Embrace Carbon
SocialFeb 20, 2026

Conservatives Embrace Carbon

Very interesting that Thomas, Alito, and Kav would sign up for carbon border adjustments under the President's emergency authority. Key question is whether the liberal wing can find space between tariffs and carbon border adjustments. https://t.co/TyTuDsECLC

By Ari Peskoe
EPA Retracts 2009 Vehicle Endangerment Finding, Admits Standards Fall Short
SocialFeb 13, 2026

EPA Retracts 2009 Vehicle Endangerment Finding, Admits Standards Fall Short

Here's EPA's undoing of its 2009 Endangerment Finding wrt to vehicles. EPA's finding is based on a new reading of the Clean Air Act. EPA also finds that its vehicle emission standards do not and could not mitigate the climate risks...

By Ari Peskoe
Data Centers Power $12B Transmission Expansion Plan
SocialFeb 13, 2026

Data Centers Power $12B Transmission Expansion Plan

Total cost for this transmission expansion plan is $12 billion. PJM provides 4 factors driving needs. I read 3 as "data centers." Here's PJM's precise wording --

By Ari Peskoe
FERC May Issue Interconnection Rule Soon, Not Thursday
SocialFeb 13, 2026

FERC May Issue Interconnection Rule Soon, Not Thursday

FERC could meet the Department of Energy's demand to issue a proposed rule about interconnecting industrial computing facilities any day. But that day will not be next Thursday at FERC's televised meeting.

By Ari Peskoe