## Attachment I

TIMETABLE

FOR

INSTALLATION OF DRY FLUE GAS DESULFURIZATION AND

PARTICULATE COLLECTION SYSTEMS

By: George Farina

Project Manager, Major Projects, TVA Fossil Group Design and Construction

and Donald Houston, P.E.

Program Manager, Clean Air Programs, TVA Environment and Technology

July 22, 2011Introduction

TVA expects Dry Flue Gas Desulphurization with baghouse (Dry FGD) may be a viable acid gas and

particulate control option for units burning medium to low sulfur coal for the expected Electric Utility

Generating Unit Hazardous Air Pollutants Maximum Achievable Control Technology (EGU HAPS MACT),

depending on the emission limits set in the final rule. We have begun conceptual design work for some

of our units, and previously commissioned a Dry FGD Conceptual Design and Targeted Cost Estimate

(CD&E) for our 4 unit John Sevier Plant. Through this work TVA has gained much knowledge in the time

required from conceptual design to completion of construction and initial operation of a Dry FGD. As

described in detail below, a minimum of 50 months is required, and additional time, up to several

months, will be required where staging with other controls and/or multi

‐ unit site congestion and other

issues (such as site access) exist. EPA’s expectation in the proposed rule that these controls can be

selected, designed, permitted, and installed in three to four years is problematic. One significant error

in EPA’s schedule expectations is lack of recognition of the time required for project planning and

engineering, and the congestion issues for retrofit installations, particularly at plants with multiple units.

We also expect the nation wide demand for additional controls will challenge control technology

suppliers to ramp up resources quickly enough to avoid delays in project start dates, and that they will

be hesitant to bid projects with aggressive performance dates that will subject them to liquidated

damages. The time required to locate, procure, permit, and construct a waste disposal facility can be

critical path for new air pollution controls, requiring approximately five years where suitable offsite

property must be located and procured.

Project Planning

Dry FGD projects are divided into 4 major phases: 1) Conceptual Design and Target Cost Estimate

Development (CD/TCE), 2) Detailed Engineering, 3) Procurement, and 4) Construction. Generally the

CD/TCE is complete before the other phases of the project begin, but some detailed engineering is

required in the CD/TCE phase. Typically, the last month or two of the CD/TCE phase includes both

conceptual as well as detailed engineering. The formal start of the detailed engineering starts with the

completion of the CD/TCE followed closely by procurement and finally construction. The work in these

three areas runs concurrently.

General descriptions of the work conducted during each phase of the project are discussed below along

with the times normally required to complete each phase. These times should be representative for

Allen Fossil Plant (ALF), which is currently being considered for dry scrubbers and already has Selective

Catalytic Reduction (SCR) installed, but is not sufficient for the Dry FGD planned at Gallatin Fossil Plant

(GAF), due to site differences including no SCRs installed at GAF.

Conceptual Design & Target Cost Estimate

Summarized below are some of the documents and drawings developed during the CD/TCE.Studies

‐ These are targeted investigations to assess potential engineering and construction issues. For

example, a study may look at alternate layout designs to identify the arrangement that not only fits the

available footprint but 1) can be erected without compromising safety, 2) enhances equipment and

material flow to the construction site, and 3) does not block future O&M access. A draft system study

will need to be conducted to determine the best approach to satisfying the draft requirements for the

new FGD system. A single ID fan and combined ID/booster fan arrangements will be assessed and the

optimum design configuration (considering engineering, cost, and O&M issues) will be selected for

implementation. Fuel supply studies to identify the range of potential future coal supplies is typically

needed.

Design Basis Document

‐ As the name implies this document contains all the information required to

design the FGD facility. The document provides general requirements and information as well as

engineering discipline specific sections. The technical design criteria includes codes and standards, both

general and TVA specific; the fuel specification; gas flow rates and temperatures; gas constituent

breakdowns; water supply, quality, and temperature information; and process performance

requirements. The mechanical system description includes details for reagent storage and prep, SO2

removal, mercury control, particulate control, and waste handling. The fire protection and detection

system defines requirements for fire pumps, water supply, alarms, underground distribution, and fire

suppression. The plumbing and drainage system details requirements for potable water, sanitary sewer,

and oily water collection and drainage. The Electrical system description includes requirements for

transformers, medium and low voltage distribution systems, motors, UPS & DC systems, lighting, cable,

cable tray, raceways, grounding, and PDC’s. The I&C system description includes the control system

architecture, instrumentation requirements and the control room design. The

architectural/civil/structural system description includes requirements for roads and parking,

underground services and utilities, plant drainage, foundations, and buildings and superstructures.

Environmental conditions describe plant elevation, extreme atmospheric conditions, seismic constraints,

wind load, snow load etc. While some design basis information is generic and applies to multiple sites,

much is unit specific and must be generated for each project.

Project Execution Plan

‐ Details how to integrate all work into a plan to complete the project safely, on

‐

time, and within budget. Approximately 200 elements covering contract and scope, project initiation,

safety, QA/QC, status reporting, cost analysis & scheduling, documentation and distribution, engineering

functions & responsibilities, procurement, materials management, construction, and project closure are

covered.

Geotechnical Report

‐ This is a third party report detailing the geological conditions (surface and

subsurface) existing at the site.

Transient Analysis

‐ A third party report detailing operational impacts the scrubber equipment will have

on the upstream (combustion) system. The report considers normal operation as well as potential

anomalies. The findings of the analysis are incorporated into the engineering designs and

administrative controls for the DFGD system.Drawings and Other Documents

‐

Plant General Arrangement Drawings

Process Flow Diagrams and Material Balances

Piping and Instrumentation Drawings

Electrical One

‐ Line Diagrams

Preliminary Piping Isometrics

Preliminary Electrical Raceways

Electrical Motor List

Instrumentation Lists

Control System Block Diagrams

DCS I/O Count

Plant Interface list

Description of Construction Packages

Description of Equipment Packages

Material Take

‐ Offs

CD/TCE Duration

‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ 10 months

Detailed Engineering

The scrubber design type is determined in the CD/TCE phase to assure SO 2 , acid gas, mercury, and

particulate removal targets can be met. Bids from the scrubber manufacturers are reviewed, a design

selected, and a fix price contract prepared for award. Under TVA’s Environmental Improvement Project

Alliance contract with URS (formally United Research Services), the TCE should be within ± 3% of the

actual installed cost of the FGD system; therefore, a significant portion of the engineering has to be

done during the first phase of the project. However, additional detailed engineering is necessary to

provide the information to prepare performance and purchase specifications for all remaining

equipment requisitions as well as any details required in the construction packages. Detailed

engineering, as noted above, starts at the completion of the CD/TCE phase followed by procurement inapproximately two months. There are approximately 20 construction packages and 35 equipment

packages. All engineering required to convert these packages into vendor bid packages must be

completed as part of the detailed engineering. All construction drawings including, for example, duct,

damper, structural steel, foundation, final piping isometrics, detailed electrical raceway, electrical cut

sheets, and I&C drawings must also be completed.

Environmental review and permitting is initiated once sufficient design details are determined to

prepare permit applications.

Detailed Engineering Duration

‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ 21 months

Procurement

During procurement, vendors are qualified, bid packages prepared, vendor bids reviewed, and contracts

awarded. Methodology to quantify the review process must be developed for the individual packages.

Negotiations with the vendors are conducted, which might include requesting best and final bid

submittals. Because of the linkage with detailed engineering, the procurement phase and detailed

engineering phases of the project typically end simultaneously. Therefore, this is no net time added to

the project associated with procurement.

Procurement Duration

‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ 19

‐ 20 months

Construction

Construction cannot begin until environmental permits are issued. Mobilization for construction usually

begins 3 to 4 months following the initiation of procurement. Construction has the longest duration

and the greatest net effect on the project timetable. Construction for dry FGD systems can usually be

broken down into general and unit specific activities. The following are the major general activities:

underground electrical and piping relocations, construction of the lime handling facilities, construction

of the waste handling facilities, construct of the activated carbon facilities, construction of the electrical

building, construction of the interconnecting pipe/electrical/I&C, and site finishes. The major unit

specific activities include: installation of the DFGD system foundations/ducts/ID fans, installation of the

fabric filter system foundations/ducts, installation of piping/electrical/I&C systems (including fire

protection), and installation of insulation/lagging. The time required for unit startup and commissioning

as well as performance testing and tuning have been included in construction duration.

Construction Duration

‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ 36 monthsIdeal Dry FGD Project Timetable with SCR Already Installed

Project Phase Duration Net Affect on Timetable

CD/TCE 10 months 10 months

Detailed Engineering 21 months 20 months

Procurement 19 months 0

Construction 36 months 20 months

Total Duration 50 months

Gallatin and John Sevier Dry FGD Project Schedules

For comparison purposes, the URS Air Quality Control System Dry FGD schedule for the four unit GAF

plant called for 50 months duration from the initiation of engineering work on to completion of work on

the first unit, and up to an additional 24 months to complete work on the last unit, depending on how

the work was staged. Conversely, URS prepared a schedule for concurrent SCRs and Dry FGD on two of

the four units at JSF and concluded that work could be completed in 41 months from the initiation of the

detailed engineering. The short time does not include DFGD TCE work, which had already been

completed. Under this scenario the remaining two JSF units would not have MACT controls installed

and would be retired. If controls for these two units were needed, additional time beyond the 50

months would be required.

Disposal Facility Schedule

Where a suitable site must located and procured, TVA expects 63 months will be required before spent

material can begin being placed in the new landfill. Site selection and procurement is expected to take

one year, followed by an additional year for a detailed hydrological and geotechnical evaluation. Nine

months is required for state evaluation of the technical evaluation, which upon completion allows

design and permitting to begin which requires 18 additional months. Construction is the final step and

is expected to take one year. Existing suitable landfills with sufficient capacity are not typically available,

so operation of the new air pollution control system normally cannot begin until the disposal facility is

operational.

## Attachment II

TIMETABLE

FOR

INSTALLATION OF WET FLUE GAS DESULFURIZATION SYSTEMS

By: George Farina

Project Manager, Major Projects, TVA Fossil Group Design and Construction

and Donald Houston, P.E.

Program Manager, Clean Air Programs, TVA Environment and Technology

July 25, 2011Introduction

TVA expects Wet Flue Gas Desulphurization (Wet FGD) may be a viable acid gas control option for units

burning medium to high sulfur coal for the expected Electric Utility Generating Unit Hazardous Air

Pollutants Maximum Achievable Control Technology (EGU HAPS MACT). TVA has considerable

experience with the installation of wet scrubbers having installed wet scrubbers on its Paradise,

Cumberland, Bull Run, and Kingston units. TVA began its work with wet scrubbers in the 1970’s with the

installation of wet scrubbers on its Widows Creek units 7 and 8. As described in detail below, a

minimum of 59 months is required to select, design, permit, and construct 2 scrubbers which is typical

when units are ganged together for control or when installing scrubbers on 2 large units. EPA’s

expectation in the proposed rule that these controls can be selected, designed, permitted, and installed

in three to four years is problematic. EPA, in fact, notes that it “does not project the use of wet

scrubbing technologies to meet the requirements of this proposed rule and that it is the technology that

typically takes a longer time to install.” A significant problem in EPA’s schedule expectations is lack of

recognition that there are plants with 5 or more small units burning medium to high sulfur coals whose

best option may be 2 wet scrubbers given that the nationwide demand for additional Dry FGD controls

will challenge these control technology suppliers to satisfy demand. Also, the time required to locate,

procure, permit, and construct a waste disposal facility can be critical path for new air pollution controls,

requiring approximately five years where suitable offsite property must be located and procured.

Project Planning

Wet FGD projects are divided into 4 major phases: 1) Conceptual Design and Target Cost Estimate

Development (CD/TCE), 2) Detailed Engineering, 3) Procurement, and 4) Construction. Generally the

CD/TCE is complete before the other phases of the project begin, but some detailed engineering is

required in the CD/TCE phase. Typically, the last month or two of the CD/TCE phase includes both

conceptual as well as detailed engineering. The formal start of the detailed engineering starts with the

completion of the CD/TCE followed closely by procurement and finally construction. The work in these

three areas runs concurrently.

General descriptions of the work conducted during each phase of the project are discussed below along

with the times normally required to complete each phase. These times should be representative for

Colbert Fossil Plant (COF), but may not be sufficient for wet scrubbers at other plants such as Shawnee

Fossil Plant (SHF), due to site differences including the number of units to be scrubbed.

Conceptual Design & Target Cost Estimate

Summarized below are some of the documents and drawings developed during the CD/TCE.

Studies

‐ These are targeted investigations to assess potential engineering and construction issues. For

example, a study may look at alternate layout designs to identify the arrangement that not only fits theavailable footprint but 1) can be erected without compromising safety, 2) enhances equipment and

material flow to the construction site, and 3) does not block future O&M access. A draft system study

will need to be conducted to determine the best approach to satisfying the draft requirements for the

new FGD system. A single ID fan and combined ID/booster fan arrangements will be assessed and the

optimum design configuration (considering engineering, cost, and O&M issues) will be selected for

implementation. Fuel supply studies to identify the range of potential future coal supplies are typically

needed.

Design Basis Document

‐ As the name implies this document contains all the information required to

design the FGD facility. The document provides general requirements and information as well as

engineering discipline specific sections. The technical design criteria includes codes and standards, both

general and TVA specific; the fuel specification; gas flow rates and temperatures; gas constituent

breakdowns; water supply, quality, and temperature information; and process performance

requirements. The mechanical system description includes details for reagent storage and prep, SO2

removal, mercury control, SO 3 mitigation, and waste handling. The fire protection and detection system

defines requirements for fire pumps, water supply, alarms, underground distribution, and fire

suppression. The plumbing and drainage system details requirements for potable water, sanitary sewer,

and oily water collection and drainage. The Electrical system description includes requirements for

transformers, medium and low voltage distribution systems, motors, UPS & DC systems, lighting, cable,

cable tray, raceways, grounding, and PDC’s. The I&C system description includes the control system

architecture, instrumentation requirements and the control room design. The

architectural/civil/structural system description includes requirements for roads and parking,

underground services and utilities, plant drainage, foundations, and buildings and superstructures.

Environmental conditions describe plant elevation, extreme atmospheric conditions, seismic constraints,

wind load, snow load etc. While some design basis information is generic and applies to multiple sites,

much is unit specific and must be generated for each project.

Project Execution Plan

‐ Details how to integrate all work into a plan to complete the project safely, on

‐

time, and within budget. Approximately 200 elements covering contract and scope, project initiation,

safety, QA/QC, status reporting, cost analysis & scheduling, documentation and distribution, engineering

functions & responsibilities, procurement, materials management, construction, and project closure are

covered.

Geotechnical Report

‐ This is a third party report detailing the geological conditions (surface and

subsurface) existing at the site.

Transient Analysis

‐ A third party report detailing operational impacts the scrubber equipment will have

on the upstream (combustion) system. The report considers normal operation as well as potential

anomalies. The findings of the analysis are incorporated into the engineering designs and

administrative controls for the Wet FGD system.Drawings and Other Documents

‐

Plant General Arrangement Drawings

Process Flow Diagrams and Material Balances

Piping and Instrumentation Drawings

Electrical One

‐ Line Diagrams

Preliminary Piping Isometrics

Preliminary Electrical Raceways

Electrical Motor List

Instrumentation Lists

Control System Block Diagrams

DCS I/O Count

Plant Interface list

Description of Construction Packages

Description of Equipment Packages

Material Take

‐ Offs

CD/TCE Duration

‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ 10 months

Detailed Engineering

The scrubber design type is determined in the CD/TCE phase to assure SO 2 , acid gas, mercury, and SO 3

removal targets can be met. Bids from the scrubber manufacturers are reviewed, a design selected,

and a fix price contract prepared for award. Under TVA’s Environmental Improvement Project Alliance

contract with URS (formally United Research Services), the TCE should be within ± 3% of the actual

installed cost of the FGD system; therefore, a significant portion of the engineering has to be done

during the first phase of the project. However, additional detailed engineering is necessary to provide

the information to prepare performance and purchase specifications for all remaining equipment

requisitions as well as any details required in the construction packages. Detailed engineering, as noted

above, starts at the completion of the CD/TCE phase. Historically, with our Wet FGD projects,

procurement begins with the start of the detailed design. There are approximately 20 construction

packages and 35 equipment packages. All engineering required to convert these packages into vendor

bid packages must be completed as part of the detailed engineering. All construction drawingsincluding, for example, duct, damper, structural steel, foundation, final piping isometrics, detailed

electrical raceway, electrical cut sheets, and I&C drawings must also be completed.

Environmental review and permitting is initiated once sufficient design details are determined to

prepare permit applications.

Detailed Engineering Duration

‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ 23 months

Procurement

During procurement, vendors are qualified, bid packages prepared, vendor bids reviewed, and contracts

awarded. Methodology to quantify the review process must be developed for the individual packages.

Negotiations with the vendors are conducted, which might include requesting best and final bid

submittals. Because of the linkage with detailed engineering, the procurement phase and detailed

engineering phases of the project typically end simultaneously. Therefore, this is no net time added to

the project associated with procurement.

Procurement Duration

‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ 23 months

Construction

Construction cannot begin until environmental permits are issued, which is usually no more than 6

months following the initiation of the detailed engineering for WFGD systems. Construction has the

longest duration and the greatest net effect on the project timetable. Construction for Wet FGD

systems can usually be broken down into general and unit specific activities. The following are the

major general activities: underground electrical and piping relocations, construction of the limestone

preparation and handling facilities, construction of the waste handling facilities, construction of the

electrical building, and construction of the interconnecting pipe/electrical/I&C, and site finishes. The

major unit specific activities include: installation of the WFGD system foundations/ducts/ID fans,

installation of the SO 3 mitigation system

, installation of piping/electrical/I&C systems (including fire

protection), and installation of insulation/lagging. The time required for unit startup and commissioning

as well as performance testing and tuning have been included in construction duration.

Construction Duration

‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ 44 months

Ideal WFGD Project Timetable with SCR Already Installed

Project Phase Duration Net Affect on Timetable

CD/TCE 10 months 10 months

Detailed Engineering 23 months 23 months

Procurement 23 months 0

Construction 44 months 26 months

Total Duration 59 monthsDisposal Facility Schedule

Where a suitable site must located and procured, TVA expects 63 months will be required before spent

material can begin being placed in the new landfill. Site selection and procurement is expected to take

one year, followed by an additional year for a detailed hydrological and geotechnical evaluation. Nine

months is required for state evaluation of the technical evaluation, which upon completion allows

design and permitting to begin which requires 18 additional months. Construction is the final step and

is expected to take one year. Existing suitable landfills with sufficient capacity are not typically available,

so operation of the new air pollution control system normally cannot begin until the disposal facility is

operational.

## Attachment III

TIMETABLE

FOR THE

CONSTRUCTION OF REPLACEMENT COMBINED CYCLE PLANT POWER

GENERATION AT AN EXISTING COAL PLANT SITE

By: Dan Tibbs

Project Manager, New Unit Services, TVA Fossil Group Design and Construction

and Donald Houston, P.E.

Program Manager, Clean Air Programs, TVA Environment and Technology

July 29, 2011Introduction

TVA expects that retirement of existing coal units and replacing them with a Combined Cycle (CC) power

plant may be a viable emissions control option to meet the expected Electric Utility Generating Unit

Hazardous Air Pollutants Maximum Achievable Control Technology (EGU HAPS MACT). TVA is currently

constructing a CC power plant at our John Sevier Reservation to replace the original coal units

constructed in the early 1950’s, and recently constructed a CC plant adjacent to our Lagoon Creek

Combustion Turbine Facility. Additionally, we have also begun conceptual design work to construct

replacement CC power plants at some of our other coal plant sites. Through this work TVA has gained

much knowledge in the time required to construct a CC plant. As shown below, a typical site will require

48 months for construction, from the point of conceptual design to commercial operation. This

schedule assumes streamlined air permitting by “netting out” the new CC emissions against reductions

from retirement of coal fired units. Additional time may be required on some sites where issues exist

related to permitting, National Environmental Policy Act (NEPA) mitigation, soil geology, site excavation,

site access, water access, fuel availability, etc.. This schedule is also based on current known lead times

of major components. As industry activity increases to replace capacity lost due to coal unit

retirements, lead times may increase which could impact the critical path of this schedule. Also note

that in order to meet a 48 month timeline, TVA plans to procure the Steam Turbine/Generator (STG),

Combustion Turbine Generators (CTG’s), and Generator Step

‐ up Transformers (GSU’s) separately and in

parallel with the Engineering, Procurement, and Construction (EPC) Contract

, which by our projections,

shortens the critical path of the project by approximately 6 to 8 months.

Project Planning

TVA Combined Cycle Power Plant projects are currently divided into 4 major phases:

1) Project Development, Preliminary Engineering, and EPC Contractor Procurement

2) EPC Engineering and Equipment Procurement

3) Construction

4) Commissioning and Start-up

Project Development, Preliminary Engineering, and EPC Contractor Procurement

Summarized below are some of the tasks required during this phase.

• Perform site field survey

• Land acquisition, if required.

• Develop site specific general arrangement of equipment

• Perform air modeling for air permit

• Develop and submit air permit

• Begin NEPA process

• Perform site geotechnical exploration to establish geotechnical design basis

• Determine water source

• Determine discharge point

• Determine fuel source

• Perform transmission interconnect study• Develop EPC specification

• Develop STG specification

• Develop project justification package

• Present project justification package to TVA Board of Directors and obtain full

project approval

• Order CTG through existing alliance contract

• Order GSU’s through existing alliance contract

• Issue EPC RFP and evaluate proposals

• Issue STG RFP and evaluate proposals

• Negotiate and award EPC contract

• Negotiate and award STG contract

Project Development, Preliminary Engineering, and EPC Contract Procurement Timeline

‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐

‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Month 0 to Month10

EPC Engineering and Equipment Procurement

Summarized below are some of the tasks required during this phase.

• Perform all detailed engineering with early emphasis on engineering required to

support the permitting, NEPA, and plant performance requirements.

• Develop specifications, solicit proposals, and award contracts for the balance of

equipment not procured by TVA

• Obtain all necessary permits prior to Month 20 such that construction can begin

EPC Engineering and Equipment Procurement Timeline ----------------Month 10 to

Month 36

Construction

Summarized below are some of the tasks required during this phase.

• Mobilize to site

• Develop and prepare site for construction (clearing, grubbing, cut, fill, etc.),

including construction laydown areas and site access roads

• Receive Equipment

• Construct Plant

• Prepare turnover packages and system descriptions

• Turnover systems from construction team to start-up team

Construction Timeline

‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Month 20 to Month 46

Commissioning and Startup

Summarized below are some of the tasks required during this phase.

• Receive individual systems from construction team

• Commission individual systems

• Commission entire plant

• Confirm air permit and plant discharge compliance• Perform plant reliability, performance, and emissions testing

• Establish operating boundaries and dispatch profile

• Turnover from start-up team to TVA for Commercial Operation

Commissioning and Startup Timeline -------------------------------------------Month 44 to

Month 48

Total Project Duration---------------------------------------------------------------------------------48

MonthsAttachmentIV