**\[NOTE: THESE PROVISIONS TO BE ADOPTED AS APPENDIX G TO THE LGIA\]**

**APPENDIX G**

**INTERCONNECTION REQUIREMENTS FOR A WIND GENERATING PLANT**

Appendix G sets forth requirements and provisions specific to a wind
generating plant. All other requirements of this LGIA continue to apply
to wind generating plant interconnections.

> **A.** **[Technical Standards Applicable to a Wind Generating
> Plant]{.underline}**

**i. [Low Voltage Ride-Through (LVRT) Capability]{.underline}**

A wind generating plant shall be able to remain online during voltage
disturbances up to the time periods and associated voltage levels set
forth in the standard below. The LVRT standard provides for a transition
period standard and a post-transition period standard.

**[Transition Period LVRT Standard]{.underline}**

The transition period standard applies to wind generating plants subject
to FERC Order 661 that have either: (i) interconnection agreements
signed and filed with the Commission, filed with the Commission in
unexecuted form, or filed with the Commission as non-conforming
agreements between January 1, 2006 and December 31, 2006, with a
scheduled in-service date no later than December 31, 2007, or (ii) wind

generating turbines subject to a wind turbine procurement contract
executed prior to December 31, 2005, for delivery through 2007.

1\. Wind generating plants are required to remain in-service during
three-phase faults with normal clearing (which is a time period of
approximately 4 -- 9 cycles) and single line to ground faults with
delayed clearing, and subsequent post-fault voltage recovery to prefault
voltage unless clearing the fault effectively disconnects the generator
from the system. The clearing time requirement for a three-phase fault
will be specific to the wind generating plant substation location, as
determined by and documented by the transmission provider. The maximum
clearing time the wind generating plant shall be required to withstand
for a three-phase fault shall be 9 cycles at a voltage as low as 0.15
p.u., as measured at the high side of the wind generating plant step-up
transformer ([i.e.]{.underline} the transformer that steps the voltage
up to the transmission interconnection voltage or "GSU"), after which,
if the fault remains following the location-specific normal clearing
time for three-phase faults, the wind generating plant may disconnect
from the transmission system.

2\. This requirement does not apply to faults that would occur between
the wind generator terminals and the high side of the GSU or to faults
that would result in a voltage lower than 0.15 per unit on the high side
of the GSU serving the facility.

3\. Wind generating plants may be tripped after the fault period if this
action is intended as part of a special protection system.

4\. Wind generating plants may meet the LVRT requirements of this
standard by the performance of the generators or by installing
additional equipment ([e.g.]{.underline}, Static VAr Compensator, etc.)
within the wind generating plant or by a combination of generator
performance and additional equipment.

5\. Existing individual generator units that are, or have been,
interconnected to the network at the same location at the effective date
of the Appendix G LVRT

> Standard are exempt from meeting the Appendix G LVRT Standard for the
> remaining life of the existing generation equipment. Existing
> individual generator units that are replaced are required to meet the
> Appendix G LVRT Standard.

**[Post-transition Period LVRT Standard]{.underline}**

All wind generating plants subject to FERC Order No. 661 and not covered
by the transition period described above must meet the following
requirements:

1\. Wind generating plants are required to remain in-service during
three-phase faults with normal clearing (which is a time period of
approximately 4 -- 9 cycles) and single line to ground faults with
delayed clearing, and subsequent post-fault voltage recovery to prefault
voltage unless clearing the fault effectively disconnects the generator
from the system. The clearing time requirement for a three-phase fault
will be specific to the wind generating plant substation location, as
determined by and documented by the transmission provider. The maximum
clearing time the wind generating plant shall be required to withstand
for a three-phase fault shall be 9 cycles after which, if the fault
remains following the location-specific normal clearing time for
three-phase faults, the wind generating plant may disconnect from the
transmission system. A wind generating plant shall remain interconnected
during such a fault on the transmission system for a voltage level as
low as zero volts, as measured at the high voltage side of the wind GSU.

2\. This requirement does not apply to faults that would occur between
the wind generator terminals and the high side of the GSU.

3\. Wind generating plants may be tripped after the fault period if this
action is intended as part of a special protection system.

4\. Wind generating plants may meet the LVRT requirements of this
standard by the performance of the generators or by installing
additional equipment ([e.g.]{.underline}, Static VAr Compensator) within
the wind generating plant or by a combination of generator performance
and additional equipment.

5\. Existing individual generator units that are, or have been,
interconnected to the network at the same location at the effective date
of the Appendix G LVRT Standard are exempt from meeting the Appendix G
LVRT Standard for the remaining life of the existing generation
equipment. Existing individual generator units that are replaced are
required to meet the Appendix G LVRT Standard.

**ii. [Power Factor Design Criteria (Reactive Power)]{.underline}**

A wind generating plant shall maintain a power factor within the range
of 0.95 leading to 0.95 lagging, measured at the Point of
Interconnection as defined in this LGIA, if the Transmission Provider's
System Impact Study shows that such a requirement is necessary to ensure
safety or reliability. The power factor range standard can be met by
using, for example, power electronics designed to supply this level of
reactive capability 606 (taking into account any limitations due to
voltage level, real power output, etc.) or fixed and switched capacitors
if agreed to by the Transmission Provider, or a combination of the two.
The Interconnection Customer shall not disable power factor equipment
while the wind plant is in operation. Wind plants shall also be able to
provide sufficient dynamic voltage support in lieu of the power system
stabilizer and automatic voltage regulation at the generator excitation
system if the System Impact Study shows this to be required for system
safety or reliability.

**iii. [Supervisory Control and Data Acquisition (SCADA)
Capability]{.underline}**

The wind plant shall provide SCADA capability to transmit data and
receive instructions from the Transmission Provider to protect system
reliability. The Transmission Provider and the wind plant
Interconnection Customer shall determine what SCADA information is
essential for the proposed wind plant, taking into account the size of
the plant and its characteristics, location, and importance in
maintaining generation resource adequacy and transmission system
reliability in its area.