On April 3, 2026, the comment period begins for the proposal to issue a significant revision to an air quality control permit to UNS Electric, Inc., for the construction and operation of four natural gas combustion turbines at the Black Mountain Generating Station located in Mohave County, Arizona. The comment period ends May 4, 2026.

Type: Class I Air Quality Permit

Permit No. 96392
Significant Permit Revision No. 103667

Permitee: 

UNS Electric, Inc.

Facility:  

Black Mountain Generating Station
Located approximately 11 Miles southwest of Kingman, Arizona
Mohave County

The facility emits the following air contaminants: coarse particulate matter with diameters 10 micrometers or less (PM₁₀), fine particulate matter with diameters 2.5 micrometers or less (PM_2.5), volatile organic compounds (VOCs), nitrogen oxides (NO_X), sulfur dioxide (SO₂), carbon monoxide (CO), and hazardous air pollutants (HAPs).

Review Documents:

• Original Published Public Notice | View Notice > 
• Draft Permit | View >  
• Draft Technical Support Document (TSD) | View TSD >
• Permit Application | View App. >
• In person at:
  • ADEQ Record Center | Learn How >
  • Kingman City Clerk’s Office, 310 N. Fourth Street, Kingman, AZ 86401

Public Comment Period:

Dates: April 3, 2026 – May 4, 2026

Comments may be submitted as follows:  

• By Email | Send Email >
• By Mail (Must be postmarked or received by May 4, 2026):

ADEQ
Air Quality Division, Air Permits

Attn: Karla Murietta
1110 W. Washington St.
Phoenix, AZ  85007

• At Virtual Public Hearing | May 1, 2026 | 3 p.m. 

EPA Petition Process: 

This permit is subject to review by EPA pursuant to 40 CFR 70.8 (Code of Federal Regulations) and Arizona Administrative Code R18-2-307. If EPA does not object to the issuance of this permit, you may petition to EPA within 60 days after the expiration of EPA's 45-day review period. A petition shall be based only on objections to the permit that were raised with reasonable specificity during the public comment period, unless the petitioner demonstrates that it was impracticable to raise such objections within such period, or unless the grounds for such objection arose after such period. Any person who petitions to EPA pursuant to 40 CFR 70.8(d) shall notify ADEQ by certified mail within 10 days after such petition.

Comments may be submitted to EPA according to the process for Title V Petitions | Learn More >