Martin502

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THE ELECTRIC DAY Energy Day Meetings December
1-2, 2004
Lou Oberski WEQ EC Chair
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The Standard Electric Day
Midnight to Midnight - Changes with time
zone - Market timelines may differ by
region but are based on midnight to midnight
in their respective time zone
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The Standard Electric Day
24 Hour Operation On peak hours Monday thru
Saturday Eastern Interconnection - - 700 a.m. to
1100 p.m. EPT 600 a.m. to 1000
p.m. CPT ERCOT - - 800 a.m. to 1100 CPT Western
Interconnection - - 700 a.m. to 1100 p.m.
PPT Off peak hours (includes all hours on Sundays
and Holidays) Eastern Interconnection - - 1100
p.m. to 700 a.m. EPT 1000 p.m.
to 600 a.m. CPT ERCOT - - 1100 p.m. to 800
a.m. CPT Western Interconnection - - 1100 p.m.
to 700 a.m. PPT
700 a.m.
1100 p.m.
On-Peak Energy Products
Midnight to Midnight Electric Day
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On-Peak Energy Products
- Most liquid on-peak 5x16 - 5 weekdays, 16
hrs/day - Contained within 1 electric day -
Spans 2 current gas days
700 a.m.
1100 p.m.
On-Peak Energy Products
Midnight to Midnight Electric Day
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Accounting,Settlement Balancing

• Done hourly based on calendar day (electric day)
• Electricity has an instantaneous supply and
  demand balance requirement
• Electricity has no equivalent to gas storage
• Voltage levels strictly regulated
• Unable to change voltage the way gas changes
  pressure

700 a.m.
1100 p.m.
On-Peak Energy Products
Midnight to Midnight Electric Day
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Conclusions
- Midnight to Midnight Electric Day exists
with time zone variations - Simple
standardization across time zones will
require changes - Electric industry is a 24
hour business with instantaneous balancing
requirements