6.12 Energy Intensity
Law
10631.2. (a) In addition to the requirements of Section 10631, an urban water management plan shall include any of the following information that the urban water supplier can readily obtain: (1) An estimate of the amount of energy used to extract or divert water supplies. (2) An estimate of the amount of energy used to convey water supplies to the water treatment plants or distribution systems. (3) An estimate of the amount of energy used to treat water supplies. (4) An estimate of the amount of energy used to distribute water supplies though its distribution systems. (5) An estimate of the amount of energy used for treated water supplies in comparison to the amount used for nontreated water supplies. (6) An estimate of the amount of energy used to place water into or withdraw from storage. (7) Any other energy-related information the urban water supplier deems appropriate. 10631.2 (b) The Department shall include in its guidance for the preparation of urban water management plans a methodology for the voluntary calculation or estimation of the energy intensity of urban water systems. Energy intensity for FY 2025 (July 1 2024 to June 30, 2025) was estimated using readily available data at IRWD using the following process: • Total energy use at IRWD for FY 2025 was compiled using the Utility API service, which provides monthly billing data (energy use and cost) in easily accessible excel files. • Potable and non-potable water use at IRWD was obtained from a tracking spreadsheet entitled "Irvine Ranch Water District Water Purchased/Delivered FY 2024-2025" developed and used IRWD’s by finance, planning and operations departments. As shown in DWR Table 6-10 below, IRWD used 128 gigawatt-hours of electricity to treat and distribute 89,980 acre-feet of water in FY 2025. The resulting energy intensity is 4,360.7 kWh per million gallons. Additionally, the quantity of self-generated renewable energy reported for IRWD’s 1 MW rooftop solar array at our Baker Water Treatment Plant as 1,701,538 kWh. This quantity of annual generation was provided by the third-party owner of the array, as required by our power purchase agreement.
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IRWD – 2025 Urban Water Management Plan
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