1. Renewable Integration and Adapting to the Changing Resource Mix in ERCOT
Sandip Sharma
ERCOT
Manager, Operations Planning
Austin Electricity Conference
April 12, 2018

2. Changing Resource Mix – Installed Capacity (MW)
MW please
*as of Feb. 2018

3. Addition of Flexible Gas Units

4. Key Features that further Renewable Integration
Grid Code
Renewable Forecast
Ancillary Services (Operational Reserves)
Real Time Operations

5. Wind Forecast Errors (Day-Ahead)

6. Ancillary Services
Actual Demand
Forecasted Demand
200 MW Error
Regulation
Non-Spin
Responsive
Load and generation are constantly changing, due to:
Daily load patterns
Instantaneous load variation
Changes in variable generation output
Generators tripping offline
Ancillary Services are procured in the Day-Ahead Market to ensure sufficient resource capacity is reserved which can be deployed in a timely manner to restore the balance between the load and generation.
Ancillary Services Products
Regulation Service
ERCOT sends signal every four seconds to increase or decrease output to the generators providing Regulation
Responsive Reserve Service
Capacity from generators or load resources that is readily available to respond to frequency events
Non-Spin Reserve Service
Capacity that can be started in 10 or 30 minutes to cover forecast errors or ramps

7. Discussion