Federal Energy Regulatory Commission 

Docket-Prefix List 

_________________________________________________________________________________________

1 of 3 10/31/2014 

Prefix Library Definition 

 ACTIVE: STANDARD DOCKET FORMAT 

AC Gen Requests for Approval by Chief Accountant 

AD Gen Administrative 

AI Gen Requests for Interpretations by Chief Accountant 

CD H Conduit Determination (< than 5 MW Facility) 

CE E, G, O, H, Gen Critical Energy Infrastructure Information 

CP G Certificates for Interstate Natural Gas Pipeline Companies 

DI H Declarations of Intention and Petitions for Declaratory Order 

DO O Depreciation and Related Matters Pertaining to Oil Pipelines 

DR E Depreciation Rates for Accounting Purposes 

DV H Power Site Lands, Restoration, Withdrawal and Vacation (Bureau of Land 

Management) 

EC E Applications of Electric Public Utilities for Authority to Sell, Lease, Purchase, 

Acquire, or Merge, and Applications for Determination of Jurisdiction 

EF E Federal Electric Rates for DOE's Power Administrations 

EG E Applications for Exempt Wholesale Generation Determinations 

EL E Miscellaneous Formal Filings Related to Electric Power 

EM G Emergency Natural Gas Sales, Transportation, Exchange Transactions and 

Replacement of Facilities 

EP H Power Site Reserves, Classifications and Designations, Right-of-Way or Lease of 

Federal Lands (Bureau of Land Management) 

ER E Electric Rate Filings 

ES E Issuance of Securities and Assumption of Liabilities of Electric Utilities 

ET E Application and Exhibits for a Permit to Site New Electric Transmission Facilities or 

Modify Existing Facilities 

EX E Electric Discussion Items 

EY E Emergency Reports for Deviations from Standards of Conduct 

FA Gen Financial Audits by the Chief Accountant for Jurisdictional Companies 

FC E or G Foreign Utility Company Request 

GP G General Tracking Docket Category for Matters Under the Natural Gas Policy Act 

GT G General Tariff Changes for Interstate Gas Pipelines

GX G Gas Discussion Items 

HC E or G Certain Filings by Holding Companies under PUHCA 

IN Gen Investigations Instituted by OGC-Enforcement 

IS O Investigations and Suspensions into Rates, Fares, Charges & Practices of Oil P/Ls 

JR H Jurisdictional Reviews of Licensed Projects 

LA E Order 697-C Site Acquisition Quarterly Reports 

LP H Lease of Power Privilege (Bureau of Reclamation) 

MC H Mining Claims for Locatable Minerals (Bureau of Land Management) 

MD E, G Mediation and Arbitration 

MG G Marketing Affiliates Non-Tariff General Filings under Order No. 497 
Federal Energy Regulatory Commission 

Docket-Prefix List 

_________________________________________________________________________________________

2 of 3 10/31/2014 

ML H Mineral Leases Usually Oil & Gas (Bureau of Land Management) 

MO E State of the Market Reports 

MT G Tariff Filings under Order No. 497 

NJ E Non-Jurisdictional / Electric 

NL E, G, O No-Action Letter 

NP E Notice of Penalty 

NR Gen News Releases 

OA E Open Access Transmission Tariffs 

OR O Oil Pipeline Rate Cases 

OT O Oil Pipeline Tariffs 

PA E, G, O, H, Gen Audits other than financial audits by the Chief Accountant 

PF G Pre-Filing NEPA Activities for Proposed Gas Pipelines 

PH E or G Exemption from or Waiver of Regulation as Holding Company (FERC-65A 

[Exemption Notification] and FERC-65B [Waiver Notification]) 

PL Gen, RM General Policy Cases 

PR G Petitions for Rate Approval for Transportation of Natural Gas under NGPA 

PT E Prefilling Activity for a Permit to Site New Electric Transmission Facilities or Modify 

Existing Facilities 

QF E Qualifying Status of Cogeneration and Small Power Production Facilities 

QM E Relief from, or Reinstatement of, Mandatory Purchase or Sell Requirement between 

Utility and Qualifying Facility, as mandated by the Energy Policy Act of 2005 

RA G, O Appeals form Denial of Requests for Adjustments Issued by Economic Regulatory 

Administration, DOE 

RC E Compliance and Enforcement of Reliability Standards

RD E Electric Reliability Standards 

RM Gen, RM Rulemaking Proceedings 

RO G, O Appeals from Remedial Orders Issued by Economic Regulatory Administration, 

DOE 

RP G Rates for Interstate Natural Gas Pipeline Companies

RR E ERO Rules and Organizational Filings 

RS G Restructuring Gas Cases under Order No. 636 

RT E Electric Rate Filings - Rate Transmission 

SA G Staff Adjustments under Section 502 of NGPA 

SC E Stranded Costs / Electric 

TC G Tariff Curtailments of Interstate Natural Gas Pipelines 

TF G Flexible Tracking Adjustments not Accompanied by Quarterly or Annual PGA Filings 

TM G Miscellaneous Tracking Adjustments not Accompanied by Quarterly or Annual PGA 

Filings 
Federal Energy Regulatory Commission 

Docket-Prefix List 

_________________________________________________________________________________________

3 of 3 10/31/2014 

TQ G Quarterly Tracking Filings and Out-of-Cycle PGA Filings of Interstate Natural Gas 

Pipelines 

TS E, G Transmission Standards 

TX E Transmission Services under Section 211 of the Federal Power Act 

UL H Unlicensed Hydroelectric Projects 

ZZ E or G Tracking Docket for Certain Non-Docketed Submissions 

 ACTIVE: NON-STANDARD DOCKET FORMAT 

HB H Headwater Benefits Related to Hydroelectric Projects 

IC Gen Information Collections - Public Involvement on the Development of the 

Commission's Information Collection Requirements Prior to OMB Approval 

ID E Interlocking Directorates for Electric Utilities 

P H Hydropower Projects 

 DISCONTINUED

AR G Area Rate Proceedings - Independent Natural Gas Producers

CI G Certificates for Small Independent Natural Gas Producers & Marketers 

CS G Certificates for Small Independent Natural Gas Producers 

DA H Bureau of Land Management - Power Site Determinations (Replaced by DV, EP, 

MC, and ML prefixes)

E- Gen All Electric Cases (Replaced by ER, ES, EL, etc. prefixes) 

FS O Fourth Section Applications of Oil Pipelines 

G- G Gas Cases - Used Prior to 1960 

IR E Requests for Waiver of PURPA Regulations 

IT E International Transmission - Electric 

JD G, O Well Category Determinations by State and Federal Jurisdictional Agencies 

PD O Depreciation and Related Matters Pertaining to Oil Pipelines (prior to March 21, 

1989) 

PV O Oil Pipeline Valuation Rates 

R- Gen Rulemakings (Prior to Formation of RM Prefix - Fiscal Year 1974) 

RE E Requests for Extensions of Time or Exemptions under PURPA 

RI G, O Rates for Independent Natural Gas Producers 

SP O Special Permission Application or Waivers for Oil Pipelines 

ST G Transportation Annual Reports / Gas 

TA G Annual Tracking Filings of Interstate Natural Gas Pipelines