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Decarbonization Implementation Plan I Zero Carbon Electricity Cost of Zero Carbon Electricity The City's decarbonization approach is predicated on 100 renewable electricity. Given this, the question becomes, what is the best source of renewable power for the Louisvilles operations? The table to the right summarizes the cost of zero carbon electricity. Based on this assessment, acquisition of renewable electricity over time is recommended to follow the following prioritization: • Decrease electrical demand through efficiency & load reduction. • On -site renewables • Renewable percentage inherent in standard Xcel electricity over time • Xcel windsource Based on this hierarchy, and given the City's current use of Xcel standard and Windsource electricity, this plan identifies the best opportunities for efficiency and on -site renewables for the City. S/kWh Pros Cons Efficiency Reduces islanded electricity demand during power outages & Load 0.04 Sometimes includes co -benefits • Some facility disruption; contracting time/process Reduction $/ kWh . Avoids line loss of utility scale solar • Avoids solar/wind impacts of utility scale renewables • Demonstrate decarbonization to local Louisville community and encourage others to do same • Avoid solar sprawl at scale - avoiding impacts to rural areas 0.065 Enable immediate accrual of energy benefits Requires maintenance (cost included in cost per kwh $ /kWh On -site (assumes 25 % of cost incentive available through Inflation Reduction Act to left) Best installed in conjunction with roof replacement, Renewables 25.5 % Production incentives available from Xcel with REC sale limiting time window RA direct payment) Avoid electrical energy loss due to transmitting power over long distances Can only provide portion of needed renewable When on -site renewables are a small percentage of the total usage of electricity facility - such as Louisville's on -site opportunities - most solar electricity would be self used and thus not negatively impact grid ................................................................................................................................. • Enable future resiliency through addition of batteries and storage • Provides some renewable electricityinherent in mix, increasing over time 9 Possibility of taint not meeting promised renewable Xcel target/uncertainty/longer uptake Standard Xcel 0.065-0.070 More expensive than on -site solar per kwh • Solar and wind sprawl/impacts in rural/farming areas Electricity $ / kWh Ease of implementation, will occur on its own over time -no need for Line loss/less efficient contracting for on -site renewable installation ................................................................................................................................. • Doesn't support resiliency • Enables immediate provision of 100 % renewable electricity; not subject to Most expensive source of renewables 0.07-0.08 allocation Xcel $/kWh (base rate+ •Ease implementation -no need for contracting for on -site renewable •Avian and aesthetic impacts of wind turbines windsource 0.0155/kWh) installation •Line loss/less efficient • Contractually guaranteed renewable source Doesn't support islandability Not currently available Limited availability, subject to new renewable Xcel projects Renewable 0.065-0.070 Approximate cost parity with standard grid electricity Solar and wind sprawl/impacts in rural/farming areas $ / kWh If can be obtained, enables immediate acquisition of renewable power Direct* •Line loss/less efficient Doesn't support resiliency *Renewable Direct is only available occasionally based on subscription. There is a current waiting list tojoin. CITY OF LOUISVILLE I FINAL REPORT V3 1 INTERNAL DECARBONIZATION PLAN 111 24