1 Integrating Wind Energy into the Electric Grid Wind Power Forum October 26, 2011 Brian Conroy, Electric System Engineering Central Maine Power Company

2 The Electric Grid The Grid Control Center Attributes of Wind Generation New England Wind Resources Integrating Wind Energy into the Electric Grid Presentation Outline

The Electric Grid

The Grid Control Center

5 Attributes of Wind Generation Variability – plant output fluctuates Uncertainty – output and timing are less predictable than ‘conventional’ generation Remote locations from network “backbone” Distributed control systems Electric utilities and control centers take all these factors into account when planning, designing, and operating interconnections with wind generation.

6 6 Significant wind potential with varying characteristics exists throughout New England 1 meter per second roughly 2.2 mph MWH New England Wind Resources Source: Levitan Phase II Wind Study for ISO New England Spring 2009, ISO New England Inc. Legend Class 7 >8.8 (m/s) Class (m/s) Class (m/s) Class (m/s) Class (m/s) 40 Miles 230 kV 345 kV

7 Higher class Wind resource and 40 mile radius of Backbone transmission Base Case Results –Onshore RegionMWAvg. Wind (m/s) CT0- ME7, MA * NEMA0- SEMA WCMA NH3, RI VT2, Total15, * Source: Levitan Phase II Wind Study for ISO New England New England Wind Resources

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