Brownsville Combined Cycle Plant-Tenaska Brownsville Public Utilities

First Entry Date: 1/1/2013
Revision Date: 1/1/2013

Location: TX
Startup Date: 2016
Size: 800 MW
Primary Fuel: Gas

From Alert--Tenaska, BPUB Partner to develop New 800 MW Combined Cycle Power Plant in Brownsville, TX

Tenaska and the Brownsville Public Utilities Board (BPUB) have entered into a development and purchase agreement for construction of a proposed 800 MW natural gas-fired combined cycle station in Brownsville, Texas. Under the agreement, PBUC would have an ownership interest in the proposed plant that entitles it to receive 200 MWs. BPUB will also supply water to the facility as well as provide the natural gas interconnection under the agreements. “We are pleased to have the Brownsville Public Utilities Board as an anchor customer for the plant,” said Greg Kelly, Tenaska Vice President of Development. Tenaska could begin construction as early as 2014, with completion as early as 2016.

Cooling tower for 800 MW Brownsville in Texas

http://www.epa.gov/region6/6pd/air/pd-r/ghg/tenaska-brownsville-app.pdf

Tenaska Brownsville Partners, LLC (Tenaska) proposes to construct a greenfield electric power generation facility in Brownsville, Cameron County, Texas (Tenaska Brownsville Generating Station).

1.1 PROPOSED PROJECT

Tenaska is proposing to permit two project designs: a 1on1 or a 2on1 combined cycle combustion turbine (CCCT) configuration. The Brownsville Generating Station will be designed to have an estimated nominal power generation summer condition output capacity of approximately 400 megawatts (MW) for the 1on1 configuration or 800 MW for the 2on1 configuration. Tenaska proposes to install Mitsubishi 501GAC combustion turbine generator(s) which will be equipped with a heat recovery steam generator (HRSG) with supplemental 250 million British thermal units per hour (MMBtu/hr, higher heating value[HHV]) natural gasfired “duct” burners. Steam from the HRSG(s) will serve a single steam turbine generator. Each combustion turbine and associated duct burner will have a common exhaust stack. Therefore, these are represented as a single emission point for each CCCT. The CCCTs will be fueled by pipelinequality natural gas only. Selective catalytic reduction (SCR) will be employed as the Best Available Control Technology (BACT) for emissions of nitrogen oxides (NOX) from the CCCTs. Oxidation Catalyst will be employed as the BACT for emissions of carbon monoxide (CO) and volatile organic compounds (VOC) from the CCCTs. Construction of the proposed plant is projected to commence in May 2014 and the plant is proposed to be operational in June 2016. The proposed Brownsville Generating Station will include the following emission sources:

> One (1) or two (2) Natural Gasfired Combustion Turbines with duct burners, including planned maintenance, startup, and shutdown (MSS) activities

> One (1) Cooling Tower

> One (1) Diesel Fire Pump Engine

> One (1) Diesel Emergency Generator

> One (1) Fuel Gas Heater

> One (1) Auxiliary Boiler

> Two (2) Diesel Storage Tanks

> Fugitive emissions from fuel and ammonia piping components and SF6 emissions circuit breakers

Tenaska proposes to use anhydrous ammonia for the SCR system. The anhydrous ammonia will be stored in a pressurized tank and the unloading operations will be equipped with a vapor return line. Therefore, the ammonia storage tank and unloading operations are not considered as potential emission sources.

Company Official Contact Name: Jim Welniak VP Engineering

Tenaska Brownsville Partners, LLC

1044 N. 115th St., Suite 400

Omaha, NE 68154-4446

402- 691-9500

E-mail Address:

jwelniak@tenaska.com