1. Status of ERTAC EGU Growth Committee September 16 th 2013

2. Eastern Regional Technical Advisory Committee (ERTAC) ERTAC convenes ad-hoc groups to solve specific inventory problems Collaboration: – States - NE, Mid-Atlantic, Southern, and Lake Michigan – Multi-jurisdictional organizations – Industry ERTAC EGU growth convened 3 years ago Goal: Build a low cost, stable/stiff, fast, and transparent model to project future EGU emissions Utility representatives provided guidance on model design and inputs AEP – Dave Long AMEREN - Ken Anderson RRI – John Shimshock NY Energy – Roger Caiazza 2

3. ERTAC EGU Subcommittees & Co-Chairs Committee Co-chairs Laura Mae Crowder, WV DEP Bob Lopez, WI DE Danny Wong, NJ DEP Subcommittees and Leads Implementation/Doris McLeod VA, Mark Janssen, LADCO Create logic for software Growth/Bob Lopez, WI & Laura Mae Crowder, WV Regional specific growth rates for peak and off peak Renewables & Conservation Programs/Danny Wong, NJ Characterize programs not already included in growth factors Data Tracking/Wendy Jacobs, CT Improve default data to reflect state specific information 3

4. Attributes of ERTAC Projection Tool Region specific growth rates for peak/off-peak Unit-specific fossil fuels (e.g., coal, gas, oil) – RE/EE and nuclear considered in growth factors Calculates future hourly estimates on unit- specific basis. Tests hourly reserve capacity. Quickly evaluates various scenarios (e.g., unit retirements, demand growth, fuel switching, and control measures) Data intensive – depends on state-supplied data. 4

5. Attributes - continued Code is not proprietary; available at no cost. Currently, states in MW, NE, and SE regions are running the model. Additionally, the following organizations are (or will) be testing: – EPA/CAMD – Texas 5

6. How does it work? Starting point: Base Year CEM data by region States provide info: new units, controls & other changes Regional Lead coordinate state review of model and inputs State Lead QA their state files Review input & output to provide guidance If future year (FY) emission goals are not met with known controls, states select the strategy to meet the goal Regional growth rates Base – Department of Energy (EIA) Annual Energy Outlook (AEO) Peak – North American Electric Reliability Corporation (NERC) Future hourly estimates based on base year activity Temporal profile matches meteorology 6

7. Growth Rates (GR) Peak GR = 1.07 Annual GR = 0.95 Transition hours of 200 & 2,000 Non Peak GR = 0.9328 (calculated) 7

8. EIA EMM(NEMS) Map – 2011, 2012, 2013 & Update to ERTAC Core Regions - 2013

9. Unit Level Example: Coal Fired Existing Unit, 800 MW DRAFT - DO NOT DISTRIBUTE9 9000 8000 7000 6000 5000 4000 3000 2000 1000 0 BaseFuture Mmbtu/hr Calendar Hours Variations in growth rate CEM Hourly Base Year Data

10. Unit Level Example: Coal Fired Existing Unit, 800 MW – SO2 Control 10 BaseFuture Base Year lbs/hr Calendar Hours Future Year lbs/hr

11. Benefits of Using the ERTAC Projection Tool Conservative predictions – No big swings in generation – No unexpected unit shutdowns Inputs are completely transparent Software is not proprietary Output files are hourly and reflect base year meteorology Quickly evaluates various scenarios – Regional and fuel modularity – Can test retirements, fuel switches, growth, and controls 11

12. Committee Disposition Committee participation has promoted critical review and deep skepticism in modeling results followed by data and methodological improvement and self correction. This might give the short term impression that the model has “problems” but this is just symptomatic of an aggressive transparent committee structure We are asking: “How does our model act in the most difficult 0.1% of hours.”

13. Project Status Completed run with 2007 & 2011 base years and 2013 AEO growth rates. Code complete to convert ERTAC EGU output to SMOKE inputs and NY/MD running through SMOKE. OTC is using ERTAC EGU V1.7 projection to 2018 & 2020 in CMAQ modeling. 13

14. Next Steps for ERTAC Planned activities: – Compare to IPM – Conduct sensitivity tests: High/low gas and coal assumptions MATS Aggressive unit shut-downs Provide continued support, documentation, and training to other states and stakeholders. Documentation at: ertac.us/egu http://marama.org/2013-ertac-egu-forecasting-tool- documentation 14

15. Review of Version 2.0 2011 base Pivot Tables Unit Level Activity Enhanced

19. 5 MATS Sensitivities Scenari o # Scenario Name Scenario Description 1 Flat rate option This scenario applies a 0.2 lbs/mmbtu SO 2 emission rate to any coal fired unit that will operate in the future year above that rate. 2 Capacity option This scenario applies 90% or 98% control to any unit that will not meet 0.2 lbs/mmbtu in the FY and that has a capacity of at least 400 MW. Smaller units with non-compliant FY emission rates will have their emission rates reduced to 0.2 lbs/mmbtu SO 2. 3 Emission rate option This scenario applies 90% or 98% control to any unit that will not meet 0.2 lbs/mmbtu in the FY and has an emission rate of more than 1.0 lbs/mmbtu SO 2 in the FY. Units with an emission rate less than or equal to 1.0 lbs/mmbtu SO 2 in the FY will have 0.2 lbs/mmbtu SO 2 applied if they do not already meet that standard. 4 Retirement option This scenario retires any unit with a capacity of less than 350 MW that does not meet 0.2 lbs/mmbtu in the FY. Coal units with a capacity of at least 350 MW and not meeting 0.2 lbs/mmbtu in the FY will have a 30% reduction in SO 2 applied in the FY. The 30% reduction in SO 2 accounts for co-benefits from HCl control strategies. 5Fuel switch option This scenario switches any coal unit with a capacity of less than 350 MW that does not meet 0.2 lbs/mmbtu in the FY to natural gas. Units with a capacity of at least 350 MW and not meeting 0.2 lbs/mmbtu in the FY will have a 30% reduction in SO 2 applied in the FY.

22. High Low Gas Growth Rate Sensitivity Compare potential future growth scenarios to see how emissions may differ between alternate growth in the exploration and development of natural gas. White Paper Available Results Available in October