1. Oncor Electric Delivery Company LLC
RELIABILITY AND OPERATIONS SUBCOMMITTEE Report to TAC Austin, TX March 4, 2010
Kenneth A. Donohoo, P.E.
Chairperson
Oncor Electric Delivery Company LLC

2. Nodal Model Effort Activity
Operations
Model
(NMMS)
Topology
Processor
(Software)
CRR
Model
Long Term
Planning
Model
NDSWG
Support
Significant
Effort
Good Shape
Improving
Under Development
Outputs
12/15/2009
02/24/2010
Updates
Continuing
Full
Functionality
Needed
SSWG
Support
Significant
Complex
Work To
Complete
SSWG
Support
Additional
Capability
Needed To Meet
Planning
Needs
Development
Delayed
03/04/2010 Ken Donohoo
ERCOT TAC Meeting - ROS Report

3. Nodal Model Effort Activity
NDSWG, SSWG and ERCOT Staff
Partners in Effort
Coordinating Well
Communications Improving
Developing solutions
Very complex translating different environments
Software tool(s) need further improvement, speed and capability
Everyone committed to meet Nodal Implementation
Continuous effort required to maintain databases
Complete coordination of operating and planning databases is the goal
Current and new NERC standards may require further operations and planning model changes to support required analysis
03/04/2010 Ken Donohoo
ERCOT TAC Meeting - ROS Report

4. TAC Voting Items
SCR Enhancements to the Proposed Transmission Outage Report
ROS unanimously voted to endorse
03/04/2010 Ken Donohoo
ERCOT TAC Meeting - ROS Report

5. ROS Activities Recognize the changing nature of the ERCOT grid
Frequency and voltage control (reactive) concern
Improvement to operating and planning data
Development of Planning Guides and Planning Working Group (PLWG)
Increases focus on planning activities
Bring all planning related documents together
Increase transparency and communication
Use same change control process as Protocols with approval to ERCOT Board
Include planning charter, generation interconnect procedures, criteria and procedures
Consolidate several separate working groups under the new working group
03/04/2010 Ken Donohoo
ERCOT TAC Meeting - ROS Report

6. ROS Issues and Action Items
Expansion of Series Capacitors (Compensation) and Possible Interactions with Power System Elements
Operations Reactive Power and Voltage Control
Planning Reactive Power Analysis
Renewable Integration Reduced Load Level Analysis
Off Peak modeling (MW and Mvar) and cases
Stability Analysis Models and Data (includes RARF)
NMMS (MOD) Implementation in Planning Environment
Planning Compliance Coordination
Integration of new standards in criteria and guides
Smart grid incorporation in planning and operations
Generator expectation communication and certification
Energy Efficiency and loss reduction
Creation of Planning Guides and Working Group (PLWG)
Consolidation of working groups
Automation of PDCWG analysis
03/04/2010 Ken Donohoo
ERCOT TAC Meeting - ROS Report

7. ROS Next Meeting Thursday, March 11, 9:30 AM at ERCOT Austin
Voting Items:
Create Planning Working Group and Develop planning guides
PDCWG Procedures
Disband WOTF and LTSTF
PRR833, Primary Frequency Response Requirement from Existing WGRs
OGRR232, Revise the Process for Submitting Biennial Unit Reactive Limits (Lead and Lag)
NOGRR027, Revise the Process for Submitting Biennial Unit Reactive Limits (Lead and Lag)
OGRR240, CREZ Facility Protection and Control Requirements
OGRR242, Section 7 System Protections Revisions to Meet Pending NERC Requirements for New Construction
Nodal Model Effort
CREZ Reactive Study Update – ABB Presentation
03/04/2010 Ken Donohoo
ERCOT TAC Meeting - ROS Report