Transcript Daily Cutover Call

Nodal Stabilization
Market Call
December 03, 2010 4:30 PM
http://nodal.ercot.com
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Antitrust Admonition
ANTITRUST ADMONITION
ERCOT strictly prohibits Market Participants and their employees who are
participating in ERCOT activities from using their participation in ERCOT activities
as a forum for engaging in practices or communications that violate the antitrust
laws. The ERCOT Board has approved guidelines for members of ERCOT
Committees, Subcommittees and Working Groups to be reviewed and followed by
each Market Participant attending ERCOT meetings. If you have not received a
copy of these Guidelines, copies are available at the Client Relations desk. Please
remember your ongoing obligation to comply with all applicable laws, including the
antitrust laws.
DISCLAIMER
All presentations and materials submitted by Market Participants or any other Entity
to ERCOT staff for this meeting are received and posted with the acknowledgement
that the information will be considered public in accordance with the ERCOT
Websites Content Management Operating Procedure.
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General Updates /
Reminders
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General Reminders / Updates
•
Day Ahead Settlement Statements and Invoices for Operating Day
12-1 were posted to the MIS
• Notification delivery issues this afternoon
– 11:11: Database corruption caused notification backlog and
slowdown on delivery
– 13:30: Notifications held to correct issue and then released to clear
backlog (which took time)
– No notifications or data were lost
– Impacts:
• Delay in SASM awards
• Delay in publishing DAM Awards (subsequent delay in DRUC) – published
14:54
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What Quantity Was Traded Through the DAM
•
•
•
A Simplistic Approach: Add
up the quantities which
create flows – TPO, EOO,
CRR source, PTP source.
Graphs shows that this
gives 54,000 MW for 1
December.
But this graph double
counts. Consider…
– PTP of 10 MW from
node A to node B
– PTP of 10 MW from
node B to node A.
These PTPs contribute a
net flow of zero between A
and B, but the graph adds
them to give 20 MW.
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Day-Ahead Raw Schedules (includes double counting) for 01-Dec-2010
MW Schedule
•
58000
56000
54000
52000
50000
48000
46000
44000
42000
40000
38000
36000
34000
32000
30000
28000
26000
24000
22000
20000
18000
16000
14000
12000
10000
8000
6000
4000
2000
0
1
2
3
4
5
6
7
8
9
CRR
5
10
PTP
11
12
13
Energy Only
14
Gen RS
15
16
17
18
19
20
21
22
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What Quantity Was Traded Through the DAM
PTP source: 15 MW
PTP source: 5 MW
EOO: 15 MW
EOB: 45 MW
B
25 MW flows into network, 25 MW flows out.
This measurement has no double counting.
Net flow out: -10 MW
Net flow out: +25 MW
Net flow out = -15 MW
PTP sink: 10 MW
PTP source: 10 MW
A
TPO: 30 MW
C
PTP sink: 5 MW
PTP sink: 15 MW
Node Sum of
sources
Sum of
sinks
Net flow
Abs(net flow)
0.5 Abs(net flow)
A
10+30=40
15
40-15=25
25
12.5
B
15+15+5=35 45
35-45=-10
10
5
C
0
0-15=-15
5
2.5
10+5=15
Hedged Energy Flow
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25
What Quantity Was Traded Through the DAM
•
•
•
The Hedged Energy Flows
is formed by summing over
all settlement points half the
absolute value of the net
flow into the network.
No PTP or CRR data is
used in forming the graph
on the right except via
impact on net flows.
The Demand Forecast is a
measure of the load to be
supplied by the network
and hence is a good basis
of comparison.
It is true that there is no
guarantee that a PTP
award will be matched by
supply/demand in real-time,
but this is the best measure
we have that avoids double
counting.
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DAM Schedule Summary for 01-Dec-2010
45000
40000
35000
30000
25000
This is the net additional usage of transmission
capacity by CRR/PTPs.*
MW
•
20000
15000
10000
5000
0
1
2
3
TPO scheduled
4
5
6
7
EOO scheduled
8
9
10
11
12
13
DAM Energy Purchase
14
15
16
17
18
Hedged Energy Flows
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20
21
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Demand Forecast
*CRR Options carried to RT and PTP Obligation bids awarded in the DAM
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Calculation of Hedged Energy Flows
For each settlement point (SP):
Absolute Value(Total DAM energy bought + Total PTP Obligation Bid awarded sinking at
the SP + Total CRR Offers not awarded in DAM sinking at the SP - Total DAM energy sold
[note: includes TPOs and EOOs awarded]- Total PTP Obligation Bid awarded sourced at
the SP - Total CRR Offers not awarded in DAM sourced at the SP)/2.
Then add that amount up for all settlement points for each hour to get the net energy
transactions system-wide.
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FAQ
Q: Does DAM check the COP resource status?
A: DAM uses the COP in two ways.
1) The HSL/LSL contained in the next day’s COP is used to determine max/min TPO
award quantities.
2) The resource status for the rest of the current day’s COP is used to determine the initial
condition (online/offline status) for the start of the next day.
DAM does not look at your COP resource status for the next operating day. If your unit is
planned to be OUT for the next day, do not submit a TPO into the DAM for any hours for
which the unit planned to be OUT
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FAQ
Q: Why was my fixed quantity block offer awarded below my offer price?
A: Fixed bids/offers cannot set the price, which means that the offer could clear below the
offer price (or bid above the bid price), or not clear even though the LMP supports it, when
the offer/bid is marginal. This is a known outcome of fixed bids/offers. For more info on
this, see Appendix 7 of the DAM requirements, posted at
http://nodal.ercot.com/docs/pd/mms/pd/damsasmr/mms_dam_and_sasm_req_09q1_v4_0
%20%28blackline%29.doc.
Recommend utilizing ‘variable’ quantity instead if it is desired to avoid this outcome.
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Questions?
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