Item #5 - Austin Energy Value of Solar Presentation — original pdf

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Value of Solar Methodology Review Joint Sustainability Committee Tim Harvey Manager, Customer Renewable Solutions October 2022 © 2022 Austin Energy Value of Solar What is the Value of Solar? The Value of Solar is the rate at which Austin Energy credits solar customers for the energy produced at their homes and businesses. How Does it Work? • Customer gets billed for all consumption • A solar meter measures the amount of energy that the solar system generates • Austin Energy multiples the monthly generation by the Value of Solar rate and issues a bill credit for all production • Solar credits only apply to the electric portion of the bill • Extra bill credits roll over to the next bill 2 Value of Solar: A New Approach Why does Austin Energy need to review the Value of Solar now? • To fulfill previous base rate review commitments • To update the rate components • To fairly compensate solar customers for their renewable energy production 3 Value of Solar Customer Categories Value of Solar Customer Category Details Solar Capacity Examples Customer Type 1. Residential and Commercial* Non-Demand Customer N/A 2. Commercial Demand Customer <1,000 kW-ac 3. Commercial Demand Customer ≥1,000 kW-ac Homeowners; small businesses such as florists, salons, daycare centers. Some business types include breweries, multi-tenant commercial, schools, retail and grocery stores. Some business types include large retail and grocery, manufacturing facilities and hospitals *Commercial customer is a business/non-residential customer 4 C U R R E N T S T R U C T U R E Components Description Customer Type Energy Value Plant Operations & Maintenance Generation Capacity Transmission & Distribution Environmental Values the cost of fuel that Austin Energy does not have to buy, based on the time that solar energy is produced Avoided cost of operations and maintenance associated with owning a natural gas plant Values the cost of additional power plants that do not have to be built Values the transmission cost savings that result from reduced consumption at peak times by solar customers Values the avoided carbon emissions of conventional generation 1 X X X X X 2 X X X 3 X X The components with orange symbols are related to costs that Austin Energy avoids due to local solar energy production 5 P R O P O S E D S T R U C T U R E Components Description Customer Type ERCOT Energy Savings Ancillary Service Savings Transmission Savings Societal Benefits The weighted average of the price of energy in the ERCOT market at the time that solar energy is produced The weighted average of the cost to make sure that the right number and type of power plants are running (to prevent an outage) Calculates savings based on the average generation at peak times, the sum of wholesale transmission service charges, and the total solar generation References the federal social cost of carbon report based on integrated assessment models and Texas-specific carbon per kWh 1 X X X X 2 X X X X 3 X X X 6 Proposed Methodology Calculations ERCOT Energy Savings This element is based on the weighted average price for energy at the time of PV generation and is calculated as the sum of the Austin Energy Node (AEN) day-ahead price for each hour in the year multiplied by the PV generation for that same hour divided by the total PV generation, as shown in the formula below. Transmission Savings This component is based on average PV generation during the ERCOT Four Coincident Peak (4CP) periods multiplied by the ERCOT postage stamp rate (the sum of the individual wholesale transmission service charges billed by each transmission service provider in ERCOT) divided by the total PV generation, as shown in the formula below. 7 Proposed Methodology Calculations Ancillary Service (AS) Savings This component is based on the weighted average price for AS at the time of PV generation. ERCOT has four ancillary service products currently that support the transmission of energy to loads and the reliable operation of the bulk electric system. These four products are: 1. Regulation Service – Up (REG UP) 2. Regulation Service – Down (REG DOWN) 3. Responsive Reserve Service (RRS) 4. Non-spinning Reserve Service (NSRS) The Ancillary Service Savings is calculated as the sum of the Scaled AS Price (the sum of the four different ancillary service products in each hour scaled to its relevant proportion with overall ERCOT energy load) for each hour multiplied by the PV generation for that same hour divided by the total PV generation, as shown in the formula below. 8 Proposed Methodology Calculations Societal Benefits This component is calculated by multiplying the emission year dollar per metric ton of CO2 (from Technical Support Document: Social Cost of Carbon, Methane, and Nitrous Oxide Interim Estimates under Executive Order 13990) by the prevailing CO2 metric tons per kWh (from the U.S. Energy Information Administration’s Texas specific State Electric Profiles report, using the CO2 lbs/MWh emissions statistic). 9 Realignment Explanation Realignment Considerations • Austin Energy proposes to align avoided costs associated with local solar energy with the PSA and transition the societal benefits to the CBC. Why does this realignment matter to customers? Austin Energy wants to be clear about how customer charges are being used to support clean energy and align the impacts with the most appropriate fund. PSA CBC PSA Power Supply Adjustment (PSA): recovers the costs of fuel for power plants and electricity purchased from the grid. Community Benefit Charges (CBC): funds additional programs and services that provide a benefit to the greater community, including the Customer Assistance Program, energy efficiency and solar programs. 10 Societal Benefits Projected Annual Budget Requirement to the CBC CBC Projected Annual Budget Requirement Realignment Considerations • Societal Benefits do not represent avoided costs to the utility, but rather represents avoided costs to society. • Shifting the Environmental Benefits/Societal Benefits to the CBC will result in increased costs to the CBC and proportional decreased costs to the PSA • Separating this value increases transparency and facilitates discussion $5,000,000.00 $4,500,000.00 $4,000,000.00 $3,500,000.00 $3,000,000.00 $2,500,000.00 $2,000,000.00 $1,500,000.00 $1,000,000.00 $500,000.00 $- FY23 FY24 FY25 FY26 FY27 FY28 FY29 FY30 FY31 FY32 FY33 FY34 FY35 Societal Benefit 11 Current Methodology Proposed Methodology Both Analyses Based on Test Year 2021 12 Proposed Methodology Proposed Methodology FY22 and FY23 FY2022 Avoided Cost ($/kWh) FY2023 Avoided Costs ($/kWh) Component < 1,000 kW-ac ≥ 1,000 kW-ac < 1,000 kW-ac ≥ 1,000 kW-ac ERCOT Energy Price $ 0.0367 $ 0.0367 $ 0.0467 $ 0.0467 Transmission Savings $ 0.0250 $ - $ 0.0267 $ - Ancillary Service Price $ 0.0015 $ 0.0015 $ 0.0027 $ 0.0027 Avoided Costs $ 0.0632 $ 0.0382 $ 0.0761 $ 0.0494 Societal Benefits $ 0.0226 $ 0.0226 $ 0.0230 $ 0.0230 Total VoS $ 0.0858 $ 0.0608 $ 0.0991 $ 0.0724 Notes: Values have been adjusted for line losses at 5.14% FYs above represents implementation year, test data is from a previous FY, example: FY23 implementation year uses Fy21 test year data and FY22 uses Fy20 13 How will the proposed methodology impact the Value of Solar rate? Customer Type Sample PV kWh Current Value of Solar Credit Proposed Value of Solar Credit 1,500 $145.50 $148.65 Residential and Commercial Non- Demand Customer Commercial Demand Customer <1,000 kW-ac Commercial Demand Customer ≥1,000 kW-ac 30,000 $2,010.00 $2,973.00 165,000 $7,755.00 $11,946.00 2022 Cents per kWh 1) 9.70 2) 6.70 3) 4.70 2023 Cents per kWh 1) 9.91 2) 9.91 3) 7.24 14 More questions or comments? Email: rates2022@austinenergy.com Fill out a feedback form: speakupaustin.org/rates ©2022 Austin Energy. All rights reserved. Austin Energy and the Austin Energy logo and combinations thereof are trademarks of Austin Energy, the electric department of the City of Austin, Texas. Other names are for informational purposes only and may be trademarks of their respective owners.