F.
Duke Energy Carolinas’s ATC Calculation
The SERC NTSG OASIS studies are performed
quarterly for the next five quarters/seasons. When first completed, the SERC NTSG
OASIS studies will cover an 18 month period. Before the next study is produced, that
period will have decreased to 15 months.
The SERC NTSG OASIS studies can be used for calculating the TTC. The SERC NTSG OASIS studies calculate
the FCTTC for each of Duke’s interface based on the following
formulas:
FCTTC= FCITC +
base transfer modeled in the OASIS study for that season
TTC = lesser of
{Contract Path or FCTTC)
Where,
FCITC = First Contingency
Incremental Transfer Capability as calculated using DC MUST in the OASIS
study.
Using the TTC as calculated above, the
calculation of Firm Available Transfer Capability (Firm ATC) and Non-Firm
Available Transfer Capability (Non-firm ATC) are as
follow:
Firm ATC = TTC – Firm Pt-Pt Reservations – Firm Network Reservations – CBM – TRM
Non-Firm ATC = TTC – Non -Firm Pt-Pt Reservations – Secondary Network Reservations – Firm Pt-Pt Schedules –Firm Network Schedules – CBM - TRM (after 10AM the day before)
Non-Firm ATC = TTC – Non-Firm Pt-Pt Reservations – Secondary Network Reservations – Firm Pt-Pt Reservations – Firm Network Reservations – CBM - TRM (before 10AM the day before)
As stated above, the seasonal TTC is based on
the corresponding OASIS study.
However, as a minimum, Duke Energy Carolinas also re-calculates TTC on a
daily basis for the next day up until November 2006 when MISO as the Independent
began to perform that task. The
load flow model for the appropriate SERC NTSG study is modified to consider near
real-time operating data such as units availability, transmission outages and
load forecast. The TTC for each
interface is calculated using the modified load flow model.
For OASIS posting beyond the time period
covered by OASIS studies, the posted TTC is the contract path. The formulas for calculating Firm ATC
and Non-Firm ATC in this period remain the same as shown above. The table below
is the formulation of the calculation done by the software used by Duke Energy
which is provided by OATI Inc. These calculations reflect the items shown in the
above formulas with reference to reservations and tags as seen by the OATI
system.
| Parameter | Scheduling Committed Initialize Firm |
Scheduling Committed Intialize Non Firm |
Operating Committed Intialize Firm |
Operating Committed Intialize Non Firm |
Planning Committed Initialize Firm |
Planning Committed Intialize Non Firm |
Scheduling Pending Intialize Firm |
Scheduling Pending Intialize Non Firm |
Operating Pending Intialize Firm |
Operating Pending Intialize Non Firm |
Planning Pending Intialize Firm |
Planning Pending Initialize Non Firm |
Scheduling Committed Firm |
Scheduling Committed Non Firm |
Operating Committed Firm |
Operating Committed Non Firm |
Planning Committed Firm |
Planning Committed Non Firm |
Scheduling Pending Firm |
Scheduling Pending Non Firm |
Operating Pending Firm |
Operating Pending Non Firm |
Planning Pending Firm |
Planning Pending Non Firm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CUFirm | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| CUNonFirm | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| ComFirm_DS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| ComNonFirm_DS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| ComResFirm | Y | N | Y | N | Y | Y | Y | N | Y | N | Y | Y | Y | N | Y | N | Y | Y | Y | N | Y | N | Y | Y |
| ComResFirm_CS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| ComResFirm_DS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| ComResNonFirm | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y |
| ComResNonFirm_CS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| ComResNonFirm_DS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| ComTagFirm | N | Y | N | Y | N | N | N | Y | N | Y | N | N | N | Y | N | Y | N | N | N | Y | N | Y | N | N |
| ComTagFirm_CS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| ComTagFirm_DS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| ComTagNonFirm | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| ComTagNonFirm_CS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| ComTagNonFirm_DS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| MiscFirm | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| MiscNonFirm | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| NWComFirmRes_Firm | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N |
| NWComFirmRes_NF | N | N | N | N | N | Y | N | N | N | N | N | Y | N | N | N | N | N | Y | N | N | N | N | N | Y |
| NWPendFirmRes_Firm | N | N | N | N | N | N | Y | N | Y | N | Y | N | N | N | N | N | N | N | Y | N | Y | N | Y | N |
| NWPendFirmRes_NF | N | N | N | N | N | N | N | N | N | N | N | Y | N | N | N | N | N | N | N | N | N | N | N | Y |
| NewComResFirm | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y |
| NewComResNonFirm | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y | N | Y |
| NewPendResFirm | N | N | N | N | N | N | Y | Y | Y | Y | Y | Y | N | N | N | N | N | N | Y | Y | Y | Y | Y | Y |
| NewPendResNonFirm | N | N | N | N | N | N | N | Y | N | Y | N | Y | N | N | N | N | N | N | N | Y | N | Y | N | Y |
| OffsetFirm | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| OffsetNonFirm | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| PendFirm_DS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| PendNonFirm_DS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| PendResFirm | N | N | N | N | N | N | Y | N | Y | N | Y | N | N | N | N | N | N | N | Y | N | Y | N | Y | N |
| PendResFirm_CS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| PendResFirm_DS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| PendResNonFirm | N | N | N | N | N | N | N | Y | N | Y | N | Y | N | N | N | N | N | N | N | Y | N | Y | N | Y |
| PendResNonFirm_CS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| PendResNonFirm_DS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| SAS1_Firm | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| SAS1_NF | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| SAS2_Firm | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| SAS2_NF | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| ScheduleFirm | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| ScheduleFirm_CS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| ScheduleNonFirm | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| ScheduleNonFirm_CS | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| SetasideFirm | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |
| SetasideNonFirm | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N |