# Transco Nominations API

**Canonical:** https://apis.io/apis/williams/transco-nominations/  
**Provider:** Williams Companies — https://apis.io/providers/williams/  
**Base URL:** https://www.1line.williams.com/Transco  
**Documentation:** https://www.1line.williams.com/Transco/index.html

Transco Nominations API is one of 2 APIs that [Williams Companies](https://apis.io/providers/williams/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Energy, Natural Gas, Pipeline, Nominations, and Transco. The published artifact set on APIs.io includes API documentation.

The Transco Nominations API enables natural gas shippers to submit, modify, and track pipeline transportation nominations on the Transco pipeline system via the 1Line electronic bulletin board portal. Nominations define the quantity of gas a shipper wants to transport, the points of injection and withdrawal, and the scheduling period. The system supports online screen entry, flat file uploads, and EDI-based nomination submission.

## Machine-readable artifacts (3)

- **Documentation** — https://www.1line.williams.com/Transco/index.html
- **Portal** — https://www.1line.williams.com/Transco/index.html
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/williams/refs/heads/main/apis.yml

## Other Williams Companies APIs (1)

- [Northwest Pipeline EBB](https://apis.io/apis/williams/northwest-pipeline/)

## Tags

Energy, Natural Gas, Pipeline, Nominations, Transco

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/williams/transco-nominations/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/williams/.