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Generation plant operations Track record of high availability 2012 2013 2014 2015 2016 2017 PGE Thermal Plants 92% 84% 89% 89% 92% 88% PGE Hydro Plants 99% 100% 100% 99% 99% 95% PGE Wind Farms 98% 98% 94% 97% 95% 96% PGE Wtd. Average 94% 89% 92% 93% 93% 90% Colstrip Unit 3 & 4 93% 66% 83% 93% 85% 86% Generation Reliability and Maintenance Excellence Program • • Corporate strategy started in 2007 to increase availability of PGE's generation plants and increase predictability of plant dispatch costs for power operations Key Elements: • • Reliability Centered Maintenance (RCM) modeling for PGE's generating plants and incorporation of models into PGE's maintenance management system (Maximo) Root Cause Analysis (RCA) for unplanned generation outages, which expedites communication across PGE's fleet on both resolution and prevention actions Portland General Electric 26 26

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