Investor Presentaiton

BONNEVILLE POWER ADMINISTRATION ☐ Historical Average PF Preference Rates Nominal (Actual) and Real (Inflation-Adjusted) Average PF Preference Rate Levels Power rates have remained relatively stable, especially on an inflation-adjusted basis $Dollars per Megawatt Hour 40 35 GNNW c ✡ 20 15 10 5 30 25 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 Nominal$ Real 2000$ PF = Priority Firm Power Real dollars derived using the BEA Implicit Price Deflator for GDP - 23 23

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