SOLAR POWER – BOONVILLE WWTP CASE STUDY September 19, 2018 Charles R SOLAR POWER – BOONVILLE WWTP CASE STUDY September 19, 2018 Charles R. Wyatt, Mayor, City of Boonville, IN Shawn Wright, Veolia North America Clint Roos, Midwestern Engineers, Inc.

Boonville, Indiana Background County Seat of Warrick County, IN ~7,000 residents City Utilities Water (~3,700 customers) Wastewater (~2,700 customers) Electric (Lease to Vectren)

Presentation Overview Overview of Grid-Connected Photovoltaic (PV) Power System Indiana Senate Bill 309 (SEA 309) – “Net Metering Law” Feasibility/Design Considerations of PV Power System Case Study – Boonville WWTP

Overview of PV Power System Photovoltaic – Anything that produces electricity when exposed to light. PV system works in tandem with utility grid. Feeds excess power back to the utility. Draws energy from the grid when renewable resources are not available. Source: Electric Light & Power

Overview of PV Power System Interconnection – Process of connecting renewable technologies to the larger electrical grid. Allows power to be transmitter between utility provider and end-user. Interconnection allows power to move back and forth in either direction. Source: Electric Light & Power

Overview of PV Power System Inverter Converts variable direct current (DC) output of a PV module into a utility frequency alternating current (AC) that can be fed into the electrical grid. Optimizer DC to DC converter technology that maximizes the energy harvest from the PV module PV Monitoring Equipment Maximizes O&M

Overview of PV Power System PV modules are connected in an array Optimizers allow each module to function at its maximum power point. PV Monitoring Equipment allows the owner to: track system performance pinpoint issues from a remote location enable more efficient maintenance Enable higher system uptime Source: Solar Power World

Indiana Senate Bill 309/IC 8-1-40 Net Metering: Means of measuring the difference between the electricity supplied by an electric utility and the electricity generated from a renewable energy resource facility owned and operated by an electric retail customer when any portion of the electricity generated by the renewable energy resource facility is used to offset part or all of the electric retail customer’s demand for electricity. Senate Bill 309 signed into law in May 2017 Facilities with a maximum capacity of 1 MW are eligible for net metering Net metered facilities must comply with Indiana’s Interconnection Standards 170 IAC 4-4.3

Indiana Senate Bill 309/IC 8-1-40 Customer must have “installed” a net metering facility by December 31, 2017 to meet the deadline for the 30-year grandfathering of previous effective net metering rules. If customer “installs” a net metering facility by December 31, 2022 the customer will get the higher retail rate for up to 15 years. After December 31, 2022, if a customer “installs” a net metering facility they will receive a lower wholesale rate plus a premium of 25 percent. Net metering customers must maintain insurance coverage of at least $100,000 against loss arising out of use of a net metered facility. Utilities may require higher amounts.

Feasibility/Design Considerations Analyze electric bills and determine annual electric demand Determine average $ per kWh Calculate size and cost of PV system Determine funding options and debt requirements Calculate O&M costs Determine if project is a Net Financial Benefit by looking at Present Value Analysis

https://pvwatts.nrel.gov/pvwatts.php

Operations & Maintenance Considerations General Site Maintenance PV Module Washing Vegetation Management Replacement Racking

Operations & Maintenance Considerations PV Module Warranties Performance Warranty (also known as Linear Power Warranty) Typically guarantees 90% power production after 10 years and 80% power production after 25 years Product Warranty Covers the integrity of the panel itself Typically 10 years

Operations & Maintenance Considerations Anticipated O&M Costs Dependent upon: Size of System Site Access Restrictions Customer Preferences Varying Distance to Customer FEMP Estimated O&M Costs ($21 +/- $20)/kW/year for systems less than 10 kW ($19 +/- $10)/kW/year for systems greater than 1 MW

Case Study – Boonville WWTP

Case Study – Boonville WWTP

Case Study – Boonville WWTP Project part of $8,780,000 Sewer Works Bond Anticipation Notes, Series 2016 City submitted Vectren Indiana Net Metering Application for Level 2 or 3 Interconnection in early 2017 Indiana Senate Bill 309 passed in May 2017 City procures PV equipment (PV Modules, Inverters, Optimizers) in late 2017 City signs Vectren Indiana Net Metering Interconnection Agreement December 2017 Vectren replaces Transformer at WWTP, Spring 2017 Construction to be complete and system fully operational by end of 2018

Case Study – Boonville WWTP PV Module Cost - $188/each (3,070 modules) PV Optimizer Cost - $74/each (1,534 optimizers) PV Inverter Cost - $2,280/each (23 total) Overall Project Cost – $1,300,000

Questions?