# NAESB Electric Industry Registry (EIR) webRegistry Web Services

**Canonical:** https://apis.io/apis/naesb/naesb-eir-webregistry/  
**Provider:** NAESB — https://apis.io/providers/naesb/  
**Base URL:** https://www.naesbwry.oati.com/cgi-bin/webplus.dll?Script=/naesbwry/WREG-Web-Services-Main.wml  
**Documentation:** https://www.naesb.org/weq/weq_eir.asp

NAESB Electric Industry Registry (EIR) webRegistry Web Services is one of 2 APIs that [NAESB](https://apis.io/providers/naesb/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Registry, Wholesale Electric, SOAP, E-Tagging, and Grid. The published artifact set on APIs.io includes API documentation, an API reference, a getting-started guide, pricing, authentication docs, and a changelog.

The NAESB Electric Industry Registry is the central repository of registry information used by the North American wholesale electric industry for electronic tagging; it replaced the NERC TSIN in 2012 and is administered for NAESB by Open Access Technology International (OATI) as OATI webRegistry. It exposes a documented SOAP 1.1 web service with methods including DownloadEntity, DownloadBA, DownloadPSE and DownloadACA, described across the 121-page OATI webRegistry Technical Guide v6.1. The service is HTTPS-only, and per section 2.5 of that guide no request is processed unless it carries a digitally signed certificate associated with a registered webRegistry user; those certificates are issued by NAESB-Authorized Certification Authorities. Access also requires a paid registry subscription. The full WSDL — one service, one portType and thirty Download* operations over thirty entity structs — IS served to anonymous callers and is harvested here verbatim. Two things complicate reaching it: the server certificate is issued by OATI's private "webCARES Server Issuing CA 2025" and does not chain to a public root, so default trust stores fail verification (curl exit 60); and once that is accounted for, an anonymous SOAP call returns HTTP 200 with ReturnCode 1 / FAILURE and the message "Please present a valid certificate that is associated with a NAESB EIR user". The contract is public; the data behind it is not.

## Machine-readable artifacts (12)

- **Documentation** — https://www.naesb.org/weq/weq_eir.asp
- **TechnicalGuide** — https://www.naesb.org/pdf4/eir_webregistry_technical_guide_v6.1_1018.pdf
- **APIReference** — https://www.naesb.org/pdf4/eir_webregistry_technical_guide_v6.1_1018.pdf
- **UserGuide** — https://www.naesb.org/pdf4/eir_webregistry_user_guide_v5.0_1023.pdf
- **GettingStarted** — https://www.naesb.org/pdf4/eir_webregistry_quick_start_guide_v3.0_1023.pdf
- **FAQ** — https://www.naesb.org/pdf4/eir_user_interface_faq_0921.pdf
- **Pricing** — https://www.naesb.org/pdf4/naesb_eir_subscription_fee010715.docx
- **Authentication** — https://www.naesb.org/pdf4/ac_authorities_2023.pdf
- **WSDL** — https://raw.githubusercontent.com/api-evangelist/naesb/refs/heads/main/wsdl/naesb-eir-webregistry.wsdl
- **ChangeLog** — https://www.naesb.org/weq/weq_eir.asp
- **Roadmap** — https://www.naesb.org/weq/weq_eir_requests.asp
- **AgentSkill** — https://raw.githubusercontent.com/api-evangelist/naesb/refs/heads/main/skills/naesb-download-eir-registry.md

## Other NAESB APIs (1)

- [NAESB REQ.21 Energy Services Provider Interface (ESPI)](https://apis.io/apis/naesb/naesb-espi-green-button/)

## Tags

Registry, Wholesale Electric, SOAP, E-Tagging, Grid

---

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