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ECITY OF <br />3�V)=:R�IL7] <br />!I <br />RIVERSIDE PUBLIC UTILITIES <br />BOARD OF PUBLIC UTILITIES <br />GENERAL MANAGER'S REPORT <br />Board Memorandum <br />DATE: JULY 24, 2023 <br />SUBJECT: MONTHLY POWER SUPPLY REPORT - MAY 31, 2023 <br />Monthly Power Usage: <br />The wholesale load (Vista Substation) for May was 162,197 MWh, which is down 14,081 MWh <br />in comparison to the same month in the previous year. Renewable generation served 56.89% <br />or 92,274 MWh of Riverside's wholesale load. The next largest category serving the wholesale <br />load for May was Market Transactions, which represented 25.97% or 42,129 MWh. Our coal <br />resource served 9.93% or 16,106 MWh of the wholesale load. Nuclear energy covered 4.50% <br />or 7,296 MWh of the wholesale load in May. Natural gas generation represents a small part of <br />Riverside's energy production at 1.07% or 1,742 MWh for May. Hydro generation has decreased <br />slightly due to capacity availability, and it currently represents 1.63% or 2,650 MWh of <br />Riverside's wholesale load. <br />Wholesale Resource Mix - May 2023 vs 2022 <br />Energy <br />2022 <br />MWh <br />2023 <br />MWh <br />Large Hydro <br />3,234 <br />2,650 <br />Natural Gas <br />1,701 <br />1,742 <br />Nuclear <br />7,897 <br />7,296 <br />Coal <br />18,937 <br />16,106 <br />Market Transactions* <br />43,620 <br />42,129 <br />Renewables <br />100,889 <br />92,274 <br />■ Large Hydro ■ Natural Gas ■ Nuclear ■ Coal ■ Market Transactions* ■ Renewables <br />2023 MWh <br />2022 MWh <br />162,197 MWh <br />176,278 MWh <br />0 20,000 40,000 60,000 80,000 100,000 120,000 140,000 160,000 180,000 200,000 <br />Wholesale Load (Vista) 176,278 162,197 MWh/Month <br />*The Market Transaction category comprises bilateral power contracts and purchases(sales) from(to) the CAISO. <br />