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Interconnection Facilities Study Report Interconnection
Facilities Study Report
Generation Interconnection
PPM Energy, LLC
Wildhorse Wind Farm



Final











December 13, 2007
Table of Contents
1.

Executive Summary ................................................................................................................1

2.

Project Information and Interconnection Plan ........................................................................2

3.

Cost Summary and Schedule.................................................................................................4

3.1

Interconnection Facilities Cost ...................................................................................................5

3.2

Network Upgrade Costs.............................................................................................................5

3.3

Tentative Construction Schedule...............................................................................................6

4.

System Impact Study Results.................................................................................................6

5.

Study Assumptions .................................................................................................................7

6.

Transmission Line Evaluation.................................................................................................7

6.1

Interconnection Facilities Work Scope ......................................................................................7

6.2

Network Upgrade Work Scope..................................................................................................8

7.

Substation Evaluation .............................................................................................................8

7.1

Interconnection Facilities Work Scope ......................................................................................8

7.2

Network Upgrade Work Scope..................................................................................................8

8.

Land Services Evaluation .......................................................................................................9

8.1

Interconnection Facilities Work Scope ......................................................................................9

8.2

Network Upgrade Work Scope..................................................................................................9

9.

Environmental Evaluation/ Permitting ..................................................................................10

9.1

CPUC General Order 131-D................................................................................................... 10

9.2

CPUC Section 851 .................................................................................................................. 11

10.

Study Updates.......................................................................................................................11

11.

Stand-by Power.....................................................................................................................11

Appendices
A.
Study Plan

B.
Work Scope

C.
Protection Requirements

D.
Telecommunication Requirements
PPM ENERGY, LLC
WILDHORSE WIND FARM PROJECT INTERCONNECTION FACILITIES STUDY REPORT
DECEMBER 13, 2007
1

1.

Executive Summary
PPM Energy, the Interconnection Customer (IC), has submitted a completed
Interconnection Request (IR) to the California Independent System Operator
Corporation (CAISO) for their proposed Wildhorse Project (Project). The Project
will consist of 140 to 150 wind turbine generators rated at 1.5 MW each, with a
total net output of 210 MW to the CAISO Controlled Grid. The Commercial
Operation Date of the Project is November 30, 2008. The Project will
interconnect onto Pacific Gas & Electric Companys (PG&E) Coburn 230 kV
Substation.
The CAISO issued an Interconnection System Impact Study (ISIS) report for this
Project on April 20, 2007 that provided an analysis of the system impacts.
In accordance with the Federal Energy Regulatory Commission (FERC) Large
Generator Interconnection Procedures (LGIP), the IC, the CAISO and PG&E
agreed that the Project can proceed into the Interconnection Facilities Study
(IFAS) phase.
The IFAS has been completed and it provides:
1. Work scope and cost estimates for the Interconnection Facilities
1
necessary
to interconnect the Project to the CAISO Controlled Grid at the Point of
Interconnection
2. Work scope and cost estimates for the Network Upgrade facilities
2
necessary
to mitigate the impacts of the Project on the CAISO Controlled Grid under
various system conditions
The Interconnection Facilities work scope consists of: Providing transmission interconnection of the generator tie-line from the
terminal tubular steel pole to the 230 kV bus at Coburn Substation Providing pre-parallel inspection, testing, SCADA, EMS setup,
engineering support, etc.
The cost of the Interconnection Facilities to interconnect the Project to the CAISO
Controlled Grid is approximately $822,000, including ITCC
3
.
The Network Upgrade facilities work scope consists of:
Converting the existing Coburn 230 kV bus to a ring bus configuration
Providing Special Protection Systems (SPS)

1
The transmission facilities necessary to physically and electrically interconnect the Project to the Point of
Interconnection of the CAISO Controlled Grid
2
The transmission facilities necessary to interconnect the Project safely and reliably to the CAISO Controlled Grid,
beyond the Point of Interconnection
3
Income Tax Component of Contribution (currently at 36%) PPM ENERGY, LLC
WILDHORSE WIND FARM PROJECT INTERCONNECTION FACILITIES STUDY REPORT
DECEMBER 13, 2007
2

The cost of the Network Upgrade facilities to interconnect the Project to the
CAISO Controlled Grid is approximately $9.4 million.
The total interconnection cost of the Project is approximately $10.3 million.
2.

Project Information and Interconnection Plan
Table 2-1 provides general information about the Project.
Project Location
Approximately 5 miles northeast of PG&Es Coburn
230 kV Substation in Monterey County, California
PG&E Planning Area
Central Coast Division
Number and Type of Generators
140 to 150 -1.5 MW GE Wind Turbine Generators
Maximum Generator Output
Estimated at 216 MW
Generator Auxiliary Load
Estimated at 6 MW
Maximum Net Output to Grid
210 MW
Power Factor
.95 lead - .95 lag
Step-up Transformer
Two 34.5/230 kV three-phase, rated at 100/167 MVA
@ 8.7% impedance on 100 MVA base
Description Of Interconnection
Configuration
The Project will interconnect at Coburn Substation
Connection Voltage
230 kV
Table 2-1: The Project General Information
Figure 2-1 provides the map for the Project and the transmission facilities in the
vicinity. A conceptual one-line diagram of the proposed project is shown in Figure
2-2.









PPM ENERGY, LLC
WILDHORSE WIND FARM PROJECT INTERCONNECTION FACILITIES STUDY REPORT
DECEMBER 13, 2007
3



Figure 2-1: Map of the Project










Salinas
Salinas
Salinas
Salinas
Salinas
Marina
Marina
Marina
Marina
Marina
Seaside
Seaside
Seaside
Seaside
Seaside
W atsonville
W atsonville
W atsonville
W atsonville
W atsonville
Coburn
Panoche
Moss Landing
Wildhorse Wind Project
Coburn Panoche &
Moss Landing Coburn
230 kV Lines
Moss Landing Panoche #2 230 kV
Coburn Panoche 230 kV
Moss Landing
-Coburn 230 kV
Salinas
Salinas
Salinas
Salinas
Salinas
Marina
Marina
Marina
Marina
Marina
Seaside
Seaside
Seaside
Seaside
Seaside
W atsonville
W atsonville
W atsonville
W atsonville
W atsonville
Coburn
Panoche
Moss Landing
Wildhorse Wind Project
Coburn Panoche &
Moss Landing Coburn
230 kV Lines
Moss Landing Panoche #2 230 kV
Coburn Panoche 230 kV
Moss Landing
-Coburn 230 kV PPM ENERGY, LLC
WILDHORSE WIND FARM PROJECT INTERCONNECTION FACILITIES STUDY REPORT
DECEMBER 13, 2007
4



Figure 2-2: Conceptual One-Line Diagram

3.

Cost Summary and Schedule
A cost summary is provided in Table 3-1, with more detailed Interconnection
Facilities and Network Upgrade costs provided in Subsection 3.2 and Subsection
3.3. Costs provided are not final and will need to be reconciled with actual costs
upon completion of the Project.
Total Interconnection Facilities Cost
$605,000



ITCC Tax @ 36 %
$217,800



Total Interconnection Facilities Cost with ITCC
$822,800


Total Network Upgrade Cost
$9,436,000



Total Network Upgrade Cost
$9,436,000


Total Project Interconnection Cost


$10,258,800 PPM ENERGY, LLC
WILDHORSE WIND FARM PROJECT INTERCONNECTION FACILITIES STUDY REPORT
DECEMBER 13, 2007
5

Table 3-1 Cost Estimate Summary
3.1
Interconnection Facilities Cost
A summary of the Interconnection Facilities cost estimates for the facilities
required to interconnect the Project is shown in Table 3-2. These facilities are
necessary to physically and electrically interconnect the Project to the Point of
Interconnection of the CAISO Controlled Grid. These costs are not final and
will need to be reconciled with actual costs upon completion of the