FERC Order 889, issued in 1996 alongside the Order 888 open-access rules, requires public utilities that own or control interstate transmission to operate an Open Access Same-Time Information System — OASIS — posting available transmission capacity and related data on equal terms to all users, and to separate transmission operations from wholesale marketing. It is arguably the oldest machine-readable data-posting mandate still operating in any sector this research has scored.
FERC Order 889
Regulator guidance United States (federal)
FERC Order 889 is the finding that complicates the simple story about American energy data.
Issued in 1996 with the Order 888 open-access reforms, it requires transmission providers to run an Open Access Same-Time Information System — a public posting of available transmission capacity, prices and related data, offered on identical terms to every market participant, with a strict separation between transmission operations and the utility’s own wholesale marketing arm. The message formats are standardised through NAESB WEQ-002 and WEQ-003 OASIS templates.
- A genuine data-posting mandate, three decades old - long before open banking, before Green Button, before anyone framed this as an API question.
- Structural in purpose - the point was to stop a vertically-integrated utility from advantaging its own trading desk with information its competitors could not see. Equal access to data as an antitrust remedy.
- Standardised message formats - NAESB WEQ templates, versioned (2.0, 2.1, 2.2, 3.3), which is why OASIS data is comparable across operators at all.
- Wholesale only - it binds transmission providers. It says nothing about the retail customer’s own usage data.
Why it matters to the reading of US energy
The State of US Energy APIs found the wholesale market operators to be the functioning half of the
American sector: the system-operator tier averages 48.3 against utility-retailer at 29.8.
ERCOT 55.0, ISO New England 54.4, MISO 54.2, PJM 48.3. PJM and ISO-NE both operate OASIS surfaces under
this order.
Meanwhile thirteen investor-owned utilities sit in the Minimal band with agent-readiness of 0.0.
The tempting summary — “the United States has no energy data mandate” — is wrong, and the precise version is more interesting. The United States mandated wholesale transmission data in 1996 and never mandated retail customer data at all. The tier under an obligation publishes; the tier without one does not. The eighteen-and-a-half point gap between those tiers is the clearest single measurement in that report of what an obligation is worth.
It is also a caution for anyone citing OASIS as evidence of good practice: ISO New England’s OASIS posting surface claims NAESB WEQ conformance that could not be verified from outside, and the modern developer surfaces these operators publish are proprietary shapes sitting alongside the mandated one rather than built on it. A thirty-year-old mandate produces a thirty-year-old artifact.
Referenced in API Evangelist papers
This regulation shows up in my published research. These reports read the machine-readable evidence provider by provider — and put this regulation in the context of a real sector.
The State of US Energy APIs
The United States does have a federal API mandate in energy — it is thirty years old and points at wholesale transmission, not at the customer. It is why the ISOs publish and the utilities do not.
