1. AmerenUE SHOW ME SOLAR June 15, 2010 MISSOURI NET METERING AND SOLAR REBATE PROGRAM Lisa Cosgrove – Renewables Specialist

2. AmerenUE AmerenUE Utilities Provides electric service to approximately 1.2 million customers across central and eastern Missouri, including the greater St. Louis area UE serves 65 Missouri counties and 500 towns More than half (55 percent) of UE’s electric customers are located in the St. Louis metropolitan area

3. AmerenUE 3 Net Metering AmerenUE  A process in which a customer can interconnect a solar or wind generator in parallel with AmerenUE’s distribution system and can be credited for the generation that is supplied to the system  Credit is made to the customer’s monthly bill  Customer’s load supplied by AmerenUE minus Customer’s generation supplied to AmerenUE’s system  Missouri Public Service Commission has approved rates for purchasing excess energy

4. AmerenUE 4 1299 Actual (Small Business’ Usage for the Month) - 742 Actual (Renewable System Generated to AmerenUE Grid) 557 Difference of Usage Minus Renewable Systems Generation x.0821 (2M Rate/Small General Service)* $ 45.73 Energy Usage Charge *2M Rate/Small General Service 8.03 Customer Monthly Charge Summer Rate.0821 (Jun-Sep) 2.83 Municipal Charge Winter Rate.0612 (Oct-May) $56.59 Total August 14 th Billing See https://www2.ameren.com/residential/Rates/ratesBundledElecFullSrvMO.aspx for specific rates

5. AmerenUE 5 424 Actual (Small Business’ Usage for the Month) - 714 Actual (Renewable System Generated to AmerenUE Grid) -290 Difference of Usage Minus Renewable Systems Generation x.0269 (Standard Summer Rate for Purchase)* -$ 7.80 Energy Generation Credit *Standard Rates for Purchase 8.03 Customer Monthly Charge *Summer Rate.0269 (Jun-Sep) 121.00 One-Time Bi-Directional Meter Charge (1 Phase Svc) *Winter Rate.0218 (Oct-May).42 Municipal Charge $121.65 Total June 16 th Billing See Sheet No. 2 (A., II., 1) of the Missouri tariff for standard rates for purchase

6. AmerenUE 6 Net Metering AmerenUE  Only kWhs fed back to the grid appear on the customer’s bill  If the customer is using what they are producing simultaneously, the bi-directional meter does not log the produced power as generated since it is used as it is being generated  Fat Spaniel is an example of an optional monitoring system available to customers to capture their renewable system’s production

7. AmerenUE 7 General Net Metering Requirements Renewable generator can be sized up to an offset of all or part of the customer’s electrical energy requirements (no greater than) Maximum renewable generator size is 100 kW nameplate AmerenUE’s bi-directional meter must be installed Safe operation of the renewable generator is the main goal for standards set in the tariff as well as reliable service for all customers

8. AmerenUE 8 Code and Safety Requirements Customer-Generator’s system hardware must comply with all applicable: National Electrical Safety Codes (NESC) National Electric Codes (NEC) Institute of Electrical and Electronics Engineers (IEEE) Local electrical codes Underwriters Laboratories (UL) requirements for electrical equipment and their installation

9. AmerenUE 9 Physical Installation Requirements Lockable, AC visible disconnect device, accessible at all times to Ameren personnel should be located between the inverter and AC panel – near the meter System should have an anti-islanding function that prevents generator from continuing to supply power when Ameren system is not energized or operating normally If designed to provide uninterruptible power to critical loads, system needs to include a parallel blocking scheme for the backup source to prevent any backflow of power to Ameren’s electrical system when not energized or operating normally

10. AmerenUE 10 AC Visable Lockable Accessible Disconnect Switch

11. AmerenUE 11 Disconnect Switch Typical Location for Signage Electric Meter COMMERCIAL NET METERED SYSTEM

12. AmerenUE 12 Customer’s Application Process – Two Steps STEP ONE  Application for solar system design (wiring diagram and cut sheets) is submitted to Ameren (Sections A-D) – Go to Ameren.com for tariff application or call Lisa Cosgrove (314) 554-2649 - lcosgrove@ameren.com  Ameren reviews application system design and either sends a letter to the customer approving their design, requests additional information or denies plans (within 30 days 10 kW and below or 90 days over 10 kW) STEP TWO  System is installed and customer has a MO licensed engineer or electrician inspect system to ensure all requirements are met and signs Section E of application  Customer signs acknowledgement Section F and sends  Ameren installs bi-directional meter $121 or $148 (depending on service type) after receiving signed Sections E and F  Ameren approves completed application and mails a copy to the customer

13. AmerenUE 13 Parallel Operated Systems 91 operational net metering applications (237.97 kW)  69 solar (200.67 kW)  8 wind (21.4 kW)  14 MO Solar for schools (1 solar/wind combo - 14.7 kW solar/ 1.2 kW wind) 4 operational parallel operating applications (99.28 kW not net metering) 21 pending net metering applications (as of 06/10)  17 solar (153.45 kW)  4 wind (11.3 kW)

14. AmerenUE 14 Current Renewable Incentives 30% federal tax credit for wind and solar renewable generation Solar PV systems that are installed 01/01/2010 and after can qualify for a $2/watt up to a 25,000 watt (25 kW) system AmerenUE rebate See www.dsireusa.org for more details on both federal and state rebate programs

15. AmerenUE 15 Rider SR – Solar Rebate Tariff Rules have not been finalized – Tariff revision possible Rebate amount $2/watt up to 25,000 watts Rebate check will only be disbursed to AmerenUE account holder for the specific project Permanently installed new solar systems or expanded solar systems operational after 12/31/09 AmerenUE Net Metering agreement required Electric retail account must be active and in good payment standing

16. AmerenUE 16 Rider SR – Solar Rebate Tariff Rebate amount determined by the DC wattage rating provided by the original manufacturer Completed Solar Rebate application with appropriate documentation required Rebate mailed to customer once system is operational Customer retains ownership of any Solar-RECs generated by their system

17. AmerenUE 17 MO Solar Cost Estimate Estimated Solar Installation Cost $7 - $9/watt Incentive $2/watt – Prop C Rebate 30% Federal Tax Credit Assumption: 2 kW system (10 panels) $8/watt X 2,000Watts = $16,000 Gross Total $ 16,000 Estimated Installation/Equipment Costs - 4,000 (rebate = 2,000 watts x $2/watt rebate) $ 12,000 - 3,600 (tax credit = 30% after the rebate deducted) $ 8,400 Net Installed Estimated Cost

18. AmerenUE 18 6.3 kW = 36 175 Watt Suntech Panels with 36 190 Watt Enphase Microinverters Mono-Crystalline Panels

19. AmerenUE 19 Electric Meter AC Disconnect AC Panel RESIDENTIAL NET METERED SYSTEM

20. AmerenUE 20 2.73 kW = 13 210 Watt Evergreen Panels with A Fronius 3,000 Watt Inverter Multi-Crystalline Silicon Panels

21. AmerenUE 21 2.1 kW = 12 175 Watt Suntech Panels With An Outback 3,500 Watt Inverter and Battery Backup Mono-Crystalline Panels

22. AmerenUE 22

23. AmerenUE 23 3.96 kW = 18 220 Watt Schott Panels With A PV Powered 3,500 Watt Inverter Poly-Crystalline Panels

24. AmerenUE 24 2.76 kW = 12 230 Watt Canadian Solar Panels With A Motech 2,900 Watt Inverter Silicon Panels

25. AmerenUE 25 39.36 kW = 192 205 Watt Evergreen Panels with A Fronius 10,000 Watt Inverter Multi-Crystalline Silicon Panels

26. AmerenUE 26 QUESTIONS ? For more information: Please visit www.ameren.com, go to “Renewables” or Lisa Cosgrove (314) 554-2649 lcosgrove@ameren.com