2013 Summer Overview Jeffrey S McDonald Power System Operator CUEA San Diego, CA June 6, 2013.

2013 Summer Overview

Jeffrey S McDonaldPower System OperatorCUEASan Diego, CAJune 6, 2013

ISO history

• ISO’s and RTO’s created following the 1992 passage of the Federal Energy Policy Act

• The California ISO was created in September 1996 as a nonprofit public benefit corporation with the passage of California Assembly Bill 1890

• March 1998 began serving 80 percent of the state

California ISO Overview

http://www.caiso.com/Pages/default.aspx

NERC Interconnections

38 Balancing Authorities in the West

California ISO service area is diverse

58,698 MW of power plant capacity

50,270 MW record peak demand (July 24, 2006)

26,500 market transactions per day

25,627 circuit-miles of transmission lines

30 million people served

309 million megawatt-hours of electricity delivered annually

Reliability Markets

• Day Ahead– opens 7 days prior to the operating day

– closes at 10 a.m. the day before electricity flows.

• Real Time– Hour Ahead Scheduling Process (HASP)

• Prior to real-time (RT) market, schedule energy and ancillary services for static interchange for 24 individual hours

– Real-time market (RTM)• runs every five minutes

High-tech control centers

• The ISO operates two control centers, main headquarters in Folsom and a second control room in Alhambra

• Operators staff the control center 24/7

• six rotating shifts (12 hours). (6 to 6)

Historical ISO Peak Demand

Slide 8

2013 ISO 1-in 2 Peak Load Forecast

• The ISO peak demand is projected to reach 47,413 MW

• 738 MW more than the actual peak 46,675 MW recorded in 2012 (2.3 percent higher)

• 3,393 MW of new generation since last year’s report

2013 Summer Loads Resources Assessment

Slide 9

http://www.caiso.com/Documents/2013SummerLoads_ResourcesAssessment.pdf

The ISO system and the NP26 and SP26 zonal results are fairly similar to results in last year’s report

The areas facing reliability risks during heat waves and other adverse conditions continue to be southern Orange County and San Diego.

SUMMARY OF KEY FINDINGS

Overview of the area and summer reliability challenges without the San Onofre nuclear power plant

Slide 13

Key actions to mitigate local reliability concerns in southern Orange County and San Diego:

• Conversion of Huntington Beach Units 3 & 4 to Synchronous Condensers

• Installation of additional reactive support near SONGS –installation of 80 MVAR capacitors at each of the Santiago and Johanna substations and a 160 MVAR capacitor at the Viejo substation.

• Barre-Ellis reconfiguration –reconfiguring the Barre-Ellis 220 kilovolt (kV) lines from the existing two circuits to four.

Slide 14

Operational Challenges

System Emergency (Procedure 4420)

• Restricted Maintenance Operations– cancel or postpone any or all or work to preserve

overall System Reliability

• Transmission Emergency– any event that threatens, harms, or limits the

capabilities of any element of the transmission grid and overall grid reliability

• OP 4420

http://www.caiso.com/Documents/4420.pdf


• Alert Notice– issued by 1500 hrs the day before anticipated

operating reserve deficiencies

• Warning Notice– issued when the Real-time Market run results indicate

that Operating Reserves are anticipated to be less required


• Emergency Stage 1– Operating Reserve shortfalls exist or are forecast to occur, and

available market and non-market resources are insufficient to maintain Operating Reserve requirements

• Emergency Stage 2– cannot maintain its Non-Spinning Reserve requirement

• Emergency Stage 3– Spinning Reserve portion depletes, or is anticipated to

depleted

Questions?

Jeffrey S McDonald

[email protected]

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2013 Summer Overview Jeffrey S McDonald Power System Operator CUEA San Diego, CA June 6, 2013.

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