Velarion Records
The Pay Desk is the free weekly executive pay briefing — one company at a time, every number traceable to a public filing.
You’ll confirm on The Pay Desk’s sign-up page.

Clean Air Act stationary source · ICIS-AIR MT0000003011100023

YELLOWSTONE POWER PLANT, Billings, MT: Clean Air Act compliance record, inspections, violations, penalties

YELLOWSTONE POWER PLANT, at 2215 N FRONTAGE RD, Billings in Yellowstone County, Montana, is an operating major source of air pollution on EPA’s ICIS-AIR register. EPA’s file records its current violation status (ICIS-AIR’s high-priority violation field) as “Unaddressed-State”. Yellowstone County is on EPA’s Green Book list of areas that do not meet a national air quality standard. The status and classification are as EPA’s facility file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the source’s current standing, quarter by quarter.

Identity

Facility as filedYELLOWSTONE POWER PLANT
ICIS-AIR IDMT0000003011100023
EPA facility registry ID110001474164
Operating statusOperating
Emissions classificationMajor source
Current violation status (ICIS-AIR high-priority violation field)Unaddressed-State
Address2215 N FRONTAGE RD, Billings, MT 59101
CountyYellowstone County
In a nonattainment countyYes (EPA Green Book)
Industry (NAICS)Utilities (NAICS 2211)
EPA region08

Cited to the EPA ICIS-AIR facility file (ECHO download).

Programs and pollutants

Velarion’s copy of EPA’s ICIS-AIR download does not yet include its program, pollutant and Title V certification files, so this page does not list the Clean Air Act programs YELLOWSTONE POWER PLANT is under or the pollutants it is permitted for. The programs each evaluation and violation below was recorded under are shown with it. EPA’s free Detailed Facility Report lists both.

Compliance evaluations

DateWhat EPA recordedAgencyPrograms
May 29, 2025FCE On-SiteState40 CFR Part 63 Area Sources; MACT Standards (40 CFR Part 63); New Source Performance Standards; Prevention of Significant Deterioration of Air Quality; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
July 6, 2023FCE On-SiteState40 CFR Part 63 Area Sources; MACT Standards (40 CFR Part 63); New Source Performance Standards; Prevention of Significant Deterioration of Air Quality; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
June 11, 2021FCE On-SiteState40 CFR Part 63 Area Sources; MACT Standards (40 CFR Part 63); New Source Performance Standards; Prevention of Significant Deterioration of Air Quality; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
December 4, 2017PCE Off-SiteStateMACT Standards (40 CFR Part 63); State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
September 27, 2017FCE On-SiteState40 CFR Part 63 Area Sources; MACT Standards (40 CFR Part 63); New Source Performance Standards; Prevention of Significant Deterioration of Air Quality; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
August 22, 2017PCE On-SiteU.S. EPAMACT Standards (40 CFR Part 63); New Source Performance Standards; Operating Permits; Prevention of Significant Deterioration of Air Quality; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
March 22, 2017PCE Off-SiteStateState Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits

Violations

A high-priority violation (HPV) is the most serious class of Clean Air Act non-compliance an agency records; a federally reportable violation (FRV) is the next step down. Each row is one determination as EPA’s violation history files it.

DateWhat EPA recordedAgencyPrograms
December 4, 2017Earliest FRV determinationStateMACT Standards (40 CFR Part 63); State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
September 27, 2017Earliest FRV determinationState40 CFR Part 63 Area Sources; MACT Standards (40 CFR Part 63); New Source Performance Standards; Prevention of Significant Deterioration of Air Quality; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
May 23, 2017HPV day-zero determinationStateMACT Standards (40 CFR Part 63); State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
May 18, 2017HPV day-zero determinationStateMACT Standards (40 CFR Part 63); State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits

Enforcement and penalties

0 formal enforcement actions since January 1, 2017, 0 of them with a penalty filed above zero. Each penalty is shown as EPA’s formal action file states it; “Not stated” means the file gives no figure, and $0 is a disclosed zero.

Informal enforcement

DateWhat EPA recordedAgency
May 22, 2018Notice of ViolationState
February 6, 2018Warning LetterState
August 4, 2017Notice of ViolationState
May 30, 2017Warning LetterState
May 30, 2017Notice of ViolationState

Stack tests

The newest 50 of 85.

DateWhat EPA recordedAgency
May 18, 2026PassState
May 7, 2026PassState
July 2, 2025PassState
May 30, 2025PassState
April 25, 2025PassState
April 25, 2025PassState
October 25, 2024PassState
July 29, 2024PassState
July 29, 2024PassState
July 29, 2024PassState
July 29, 2024PassState
July 29, 2024PassState
July 29, 2024PassState
July 29, 2024PassState
July 19, 2024PassState
May 9, 2024PassState
May 9, 2024PassState
October 5, 2023PassState
July 21, 2023PassState
March 21, 2023PassState
March 10, 2023PassState
January 23, 2023PassState
December 12, 2022PassState
September 30, 2022PassState
April 28, 2022PassState
October 28, 2021PassState
May 5, 2021PassState
May 3, 2021PassState
October 13, 2020PassState
September 30, 2020FailState
September 30, 2020FailState
September 30, 2020PassState
September 30, 2020PassState
September 30, 2020PassState
September 30, 2020PassState
September 29, 2020PassState
August 28, 2020PassState
August 28, 2020PassState
August 28, 2020PassState
August 28, 2020FailState
August 28, 2020PassState
August 28, 2020PassState
July 20, 2020PassState
April 21, 2020PassState
April 21, 2020PassState
April 21, 2020PassState
January 10, 2020PassState
October 9, 2019PassState
September 6, 2019PassState
September 6, 2019PassState

Cited to the EPA ICIS-AIR evaluation, violation, stack test and enforcement files (ECHO download), events dated January 1, 2017 or later as loaded; up to 50 rows of each shown, newest first.

Watch this source

One source, $99/month. A source: the register entry for a plant, refinery, kiln, generating station, or other fixed installation the agency tracks under the Clean Air Act. Choose “One source” and enter this source’s ICIS-AIR ID, MT0000003011100023.

Start the watch

How often?
  • One source — $99/month
  • One county — $2,990/year
  • One state — $4,990/year
  • The whole register — $18,000/year

How we handle your data → Privacy

EPA publishes a free Detailed Facility Report for every source on ECHO: its compliance status quarter by quarter, its evaluations, and its violations, enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter EPA facility registry ID 110001474164 there.

Nearby on the register

Figures from EPA’s ICIS-AIR download, loaded September 14, 2026.