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POTABLE WATER AND SEWERS The potable water production sector (wells, pumps, reservoirs, and the water treatment plant facilities) is second largest emitter of GHGs. Potable water accounts for about a quarter of the GHG emissions from city operations. Emissions from this sector have been declining over the past several years, in part due to Xcel Energy's cleaner grid mix, and to an increase in efficiency of variable drive motors. Many of the water treatment plants and pumps have seen a decrease in energy use in the 10-year period of the analysis. However, there are a few plants and pumps that have increased energy consumption, including Water Treatment Plants 1 and 10, and Well 10 Pump House. The major source of emissions from potable water production comes from electricity. GHG Emissions by Energy Type for Potable Water ■ Electricity ■ Natural Gas Figure 13 GHG emissions from electricity and natural gas consumption for potable water City Action Identify opportunities to improve efficiency and increase renewable energy production and consumption. • Continue efforts to improve the efficiency of potable water delivery • Enter energy use data into B3 • Identify possible sites for ground mount solar and storage o Ground mount solar and storage have the added benefit of increasing the resilience of the water supply system by providing electricity to the system in the event of a power disruption • Purchase RECs for the remaining electricity usage • Encourage residents and businesses to reduce water consumption through conservation • Reduce water consumed by city operations o Increase native, drought resistant plant coverage o Collect and use rainwater as an alternative to pumped water for landscape irrigation The following measures can be tracked using GreenStep Cities Step 4: • Residential gallons used per person per day • Business gallons used per job per day • Annual city operations' gallons • Annual energy used per million gallons of water