Flexible Renewable Storage Potential

17 Gross Customer Additions 20,000 LEADING IN CUSTOMER GROWTH 18,000 2.4% 16,000 14,000 12,000 1.6% 10,000 8,000 0.8% 0.9% 6,000 4,000 2,000 2007 2008 2009 2010 2011 0.8% 0.9% 2012 Conversions 2013 1.8% 1.7% 1.7% 1.5% 1.5% 1.5% 1.4% 1.4% 1.5% 1.3% 2014 2015 Construction 2016 2017 2018 Net Growth Rate 2019 2020 Q3 2021 1.0% 0.5% 0.0% 3.0% 2.5% 2.0% Net Customer Growth Rate NW NaturalⓇ

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