URPX — Utility Rate Plan Exchange
An open data standard that makes rate plans machine-readable.
What it is
An OWL ontology with 211 classes and 268 properties that captures the full complexity of modern rate structures — time-of-use schedules, demand charges, DER provisions, tiered pricing, seasonal overlays — in a format any software system can consume.
Why it matters
The US has a standard for energy usage data (Green Button) but no equivalent for the pricing of that energy. URPX fills that gap with institutional backing from LF Energy.
Status
LF Energy Standards and Specifications. Version 0.2.0 pre-draft. Vendor-neutral, open-source.
Governance and participation
URPX is developed under the Linux Foundation Energy umbrella as part of LF Energy Standards and Specifications. The standard is open source, vendor-neutral, and developed through an open process. Flux Tailor maintains the specification and reference implementations while working toward broader community governance.
Standards ecosystem
Green Button
Energy usage data standard. Adopted by hundreds of US utilities. Answers "how much energy did you use?"
URPX
Rate plan data standard. 211 OWL classes, 268 properties. Answers "how much does that energy cost, and under what rules?"
Carbon Data Specification
LF Energy project for carbon intensity data. URPX is designed to complement CDS in carbon-aware rate analysis.