Cogeneration Preconference Workshop

It's Gas!

The Plant Operations and Maintenance Committee of the PNCWA is holding a workshop just prior to the annual conference in Boise, Idaho on Cogeneration. When signing up for the annual conference, take advantage and find out what to consider if contemplating using your Digester Gas as a revenue stream.

This workshop will cover the components of cogeneration in an attempt to answer the question of the feasibility of cogeneration. There will be an overview of the costs associated with procuring, operating, and maintaining a cogeneration facility through its lifecycle. Included in the analysis will be a list of benefits and revenue streams that can be generated to cover some or all of the costs associated with running such a facility. Alternatives to cogeneration will be discussed as well.


The workshop will include a discussion of costs, revenues, and benefits for plant managers and decision makers to help determine if co-generation is right for your facility.

Learning Objectives: Factors and means that go into the decision of whether to implement cogeneration at your facility.

Who Should Attend? Plant staff, plant managers, municipality decision makers.

Organized by Joel Borchers (Clean Water Services) and Christina Davenport (City of Bend)

Moderated by Susan Hildreth, King County

Agenda and Presentations

9:00 – 9:15 Introduction

9:15 – 9:45 Turn up the Heat - Anthony Tartaglione, Black and Veatch

"This paper will benefit utility managers and operational staff by providing guidance on how to improve project efficiency. Alternatives considered to increase the hot water supply and performance are discussed along with capital and life cycle costs for each.  The approach described in this paper capitalizes upon operational staff knowledge to potentially utilize and integrate existing systems in the design increasing efficiencies."

9:45 – 10:15 Conversion of WWTP Digester Gas into Compressed Natural Gas Vehicle Fuel

PART 1 – Paul Stout, Cornerstone Environmental Group, A Tetra Tech Company

This presentation presents the technical aspects of converting digester gas to RNG and several case studies of recent projects that study and convert WWTP digester biogas into RNG vehicle fuel. Conversion of digester biogas requires capturing and cleaning the gas prior to processing it into vehicle fuel. Additional organic wastes can also be added into the digester to increase biogas production.

10:15 – 10:30 break

10:30 – 11:00 Conversion of WWTP Digester Gas into Compressed Natural Gas Vehicle Fuel

PART 2 – Paul Stout, Cornerstone Environmental Group, A Tetra Tech Company

This is a continuation of the 9:45-10:15 presentation.

11:00 – 12:00 Cost of Operating and Maintaining a Cogeneration System – Patrick Orr, Clean Water Services

"A fully functioning cogeneration facility consists of many systems. Operating and maintaining each of the systems will have a cost associated with it. These costs will typically include labor, material or parts, and consumables. Developing a plan for operating and maintaining each system will allow for budgeting and labor requirements associated with a successful cogeneration facility."

12:00 – 1:00 lunch break

1:00 – 2:00 A Presentation on the Cogen project at Central Kitsap WWTP – Peter Zemke, Brown and Caldwell

"Central Kitsap WWTP provides an example of how cogeneration can be feasible for smaller municipalities. This presentation describes the performance and features of the plant’s 250-kW cogeneration system."

2:00 – 3:00 Lessons learned from Planning, Designing, Constructing and Commissioning Biogas-Fueled Cogeneration Systems – David L. Parry, CH2M now Jacobs

"Insights from different phases of the projects are given with regards to selection of cogeneration units, biogas treatment process, hydronic system design, and electrical interconnection."

3:00 – 3:15 Break

3:15 - 4:15 Cogeneration feasibility study for Bend, Oregon - Jeremy Keller, Ameresco

"A presentation on reducing the biogas monetization options to consider for your digester with an early focus on return on investment and risk transfer.”

4:15 - 4:30 Wrap up

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