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

2. 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)

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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.

10. 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

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

14. 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

15. 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

16. Case Study – Boonville WWTP

17. Case Study – Boonville WWTP

18. 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

19. 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

20. Questions?