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TCAAP Energy Integration Resiliency Framework <br />Energy Source Implementation <br /> <br /> <br /> 48 <br /> <br />Figure 10: Ground source heat pump operation <br />3.3.3. Greenhouse Gas Reduction <br />One important advantage of a low-temperature district energy system is the reduction of greenhouse <br />gas emissions. Carbon dioxide is the primary greenhouse gas emission that is monitored and measured <br />for the heating and cooling of buildings. The carbon dioxide emission rates used to calculate the <br />savings of the low-temperature district energy system are included in Table 15. <br /> <br />Carbon Dioxide Emission Rates <br />Natural Gas1 117 CO2 lb/MMBtu <br />EPA MROW Emission Factor2 1,536 CO2 lb/MWh <br />Electric Utility1 1,041 CO2 lb/MWh <br />Notes: <br />1.https://www.xcelenergy.com/staticfiles/xe/Corporate/CRR2013/environment/emissi <br />ons-reporting.html ttp://www.epa.gov/climateleadership/documents/emission- <br />factors.pdf <br />2. http://www.epa.gov/climateleadership/documents/emission-factors.pdf <br />Table 15: Carbon dioxide emission rates <br />When comparing emission rates between traditional HVAC systems and the proposed low- <br />temperature district energy system in the Hill and Creek neighborhoods, carbon dioxide emissions are <br />reduced by almost 30%. The comparison of the estimated greenhouse gas emissions is shown in Table <br />16.