Common use of Min Clause in Contracts

Min. 10 Min. X 1 Stallings 1-4 15 Min. 15 Min. X 1.5 Tilton 1-4 10 Min. 10 Min. X 1 Vermillion GT 15 Min. 15 Min. X 1 Notes and additional limitations: --------------------------------- Ramp rates may be further limited at times by stack opacity. Wood River 5 minimum load requires reduction of steam pressure. Havana 6 emergency ramp rate requires a minimum of 2 coal mills in operation. No more than one start up per day on cycled stea▇ ▇▇▇ts. Baldwin 1 and 2 and Havana minimum loads may change after gaining ex▇▇▇▇▇▇▇e with SCR operation. Appendix 4

Min. 10 Min. X 1 Stallings 1-4 15 Min. 15 Min. X 1.5 Tilton 1-4 10 Min. 10 Min. X 1 Vermillion GT 15 Min. 15 Min. X 1 Combustion Turbines Total System Total Notes and additional a▇▇ ▇▇▇▇▇▇▇▇▇▇ limitations: --------------------------------- -------------------------------- Ramp rates may be further limited at times by stack opacity. Wood River 5 minimum load requires reduction of steam pressure. Havana 6 emergency ramp rate requires a minimum of 2 coal mills in operation. No more than one start up per day on cycled stea▇ steam ▇▇▇ts. ▇s. Baldwin 1 and 2 and Havana minimum loads may change after gaining exexp▇▇▇▇▇▇▇e ▇ with SCR operation. Appendix APPENDIX 4