EPA Proposed Rule for

Navajo Generating Station

EPA is requesting comment on proposals requiring the

N j ava o G ti enerating St ti a on (NGS) to cut emi i ss ons of oxides

of nitrogen (NOx) and reduce the impact NGS has on

visibility in National Parks and Wilderness Areas. The

comment period closes on January 6, 2014.

Navajo Generating Station (2250 MW):

• Nearly 40‐year old coal‐fired power plant with 3 units

• Among the largest sources of NOx emissions in the United States

• Located on the Navajo Nation Reservation, near Page, Arizona

• Extended lease with Navajo Nation ends in 2044

• Burns coal from the Kayenta Mine, located on reservation lands of the Navajo Nation and  the Hopi Tribe

• Supplies most of the power used by the Central Arizona Project to pump Colorado River water throughout Arizona

• Central Central to water settlement settlement agreements agreements approved approved by Congress Congress for numerous numerous Indian Tribes located located in Arizona Arizona

• Affects visibility at 11 National Park and Wilderness Areas in Arizona, Utah, Colorado, and New Mexico

What is EPA Proposing?

BART Alternative 1 to BART TWG Alternative to BART

NO Emission 0 055 lb/MMBtu 0 055 lb/MMBtu Step 1: Close one unit or curtail x Emission

Limit

0.055 lb/MMBtu,

achievable with

selective catalytic

reduction (SCR)

0.055 lb/MMBtu,

achievable with SCR

Step 1: Close one unit or curtail

electricity generation

Step 2: Install SCR on two units to meet

limit of 0.07 lb/MMBtu

Compliance

Date

5 years from final rule

(e.g., 2018 or 2019)

One unit per year in

2021, 2022, and 2023

Step 1 by December 31, 2019

Step 2 by December 31, 2030

Considerations Based on five‐factor f

analysis required by

the Clean Air Act

Credit for early NOx

reductions from

voluntary installation of

Low NOx Burners

Based on Alternative submitted by NGS

operator and other stakeholders;

Accounts for divestment in NGS by two

existing owners

Please see EPA’s proposed rulemakings from February 5, 2013 and October 22, 2013 for more detailed information on BART,

Alternative 1, and the TWG Alternative. The TWG Alternative includes several alternative operating scenarios that are not

discussed in detail in the table above.

How Can I Participate in the Rulemaking Process?

• Attend any of the optional Open House and Public Hearing Events scheduled for November 12 ‐15, 2013. You may

submit comments in writing or provide oral comments at the public hearings; or

• Send written comments on EPA’s proposals before January 6, 2014, using any of the following methods:

• Federal eRulemaking Portal: http://www.regulations.gov, identified by Docket # EPA‐R09‐OAR‐2013‐0009

• Email: r9ngsbart@epa gov r9ngsbart@epa.gov

• Mail or delivery: Anita Lee (Air‐2), U.S. EPA Region 9, 75 Hawthorne Street, San Francisco, CA 94105‐3901

Where Can I Find More Information?

All documents are available electronically on EPA’s website, with a link to the regulations.gov docket at:

http://www.epa.gov/region9/air/navajo/index.html#proposed or hard copy documents are also available for viewing

at EPA Region 9 – please schedule an appointment at least 24‐hours in advance by calling (415) 972‐3958.