GUG – Generator Users Group


The Generator Users Group (GUG) was formed to provide an opportunity for owner/operators of electric generators worldwide (initially 1500/1800- and 3000/3600-rpm machines) to share experiences, best practices, and lessons learned on design, installation, operation, maintenance, and overhaul. Expected outcomes are improved plant safety, maintainability, availability/reliability, and efficiency, as well as more effective transfer of industry knowledge from experienced engineers to those with less experience.

Technical content for, and discussion management at, GUG meetings is the responsibility of the steering committee comprised of users only. Click appropriate tabs at left to get the preliminary agenda for the upcoming meeting and to review brief professional abstracts of steering-committee members. Everything else required to conduct GUG meetings—including venue arrangements, registration, meals, badges, audio/visual equipment, promotion through media and the International Generator Technical Community (IGTC, www.generatortechnicalforum.org)—is the responsibility of a small group of non-user industry volunteers.

The idea for a generator users group, and the energy behind its launch, came from Clyde V Maughan, president, Maughan Generator Consultants. By calling some of his many user friends and associates and urging their participation on the steering committee, and getting meaningful support from NV Energy, the IGTC, PowerUsers, SV Events, and CCJ ONline, he was able to move this initiative forward.

Generator Users Group Steering Committee


Photo taken: 2019 Conference in St. Louis, MO

Front row, left to right: Jane Hutt, IGTC; Ryan Harrison, Heartland Generation Ltd.; Jagadeesh Srirama, NV Energy
Back row, left to right: John Demcko, EUMAC, Inc.; Jeff Phelps, Southern Company; Kent Smith, Duke Energy; Dave Fischli, Duke Energy; Joe Riebau, Exelon
Camera Shy: Craig Spencer, Calpine

Steering Committee Members:

Dave Fischli – (2020 Chair)
Generator Program Manager, Duke Energy

Fischli is responsible for the safety, health, and reliability of Duke Energy’s fleet of more than 300 generators. This mission is fulfilled by developing programs, initiatives, and business cases to address common fleet issues. It involves PM program optimization, early threat identification and elimination, and strategic upgrade planning for the fleet. Previously, he spent 10 years at the company’s McGuire Nuclear Generating Station providing technical oversight for its steam turbines and generators. During this period, Fischli was the lead technical design authority for several turbine upgrade projects to increase station output by 2%, as well as for generator stator replacements on both units to restore their 1450-MVA nameplate condition.
Academics: BS, Mechanical Engineering, North Carolina State Univ; MS, Engineering Management, Drexel Univ.
Committee member since 2015
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Jeff Phelps – (Vice-Chair)
Principal Engineer – System Generator SME, Southern Company

Jeff holds a BSEE from Tennessee Tech University and has over 34 years of experience supporting Southern Company’s turbo and hydro generator fleet. Specific responsibilities include providing generator and auxiliary system engineering, maintenance, and operational support. Additionally, Jeff serves as the system generator SME in support of strategic planning, root cause investigation, and vendor product evaluation.
Committee member since 2018
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Joe Riebau
Senior Manager, Electrical Engineering and NERC, Exelon Power Generation

Riebau began his career with Baltimore Gas & Electric Co more than three decades ago in the substation equipment and test department. He has spent most time since working in and managing maintenance and engineering programs for nuclear, fossil-fired, wind, and solar generating plants—including projects involving substation and plant electrical equipment, generators, motors, transformers, protective relaying, electrical safety, construction, project management, and turbine engineering and maintenance.
Academics: BS, Electrical Engineering, Georgia Institute of Technology; BS, Engineering Administration, George Washington Univ.
Committee member since 2015
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Kent Smith
Manager of Generation Engineering, Duke Energy

Smith’s career in the electric utility industry spans 35 years. Work experience after training as an electrician’s mate in the US Navy includes several positions in the maintenance and engineering departments of General Public Utilities (Three Mile Island Nuclear Station and Oyster Creek Nuclear Generating Station), Florida Power Corp, Progress Energy, and Duke Energy. Hands-on positions included: electrician, I&C technician, startup/functional test engineer, nuclear planner and scheduler, nuclear systems engineer, corporate nuclear electrical engineer, and generator specialist, engineer, and subject-matter expert. Smith’s management experience: nuclear I&C shop and nuclear electric shop supervisor, nuclear electrical/I&C engineer supervisor, and superintendent of electrical/I&C maintenance at Crystal River (fossil units) before assuming his current position in Duke’s turbine and generator services group.
Academics: BS, Applied Science and Technology, Trenton State College; MS, Electrical Engineering, Univ of South Florida; MS, Computer Science, Univ of South Florida.
Committee member since 2015
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Craig Spencer
Director of Outage Services, Calpine

Craig Spencer began his career as an engineering technician in Westinghouse’s Generator Service Group while earning a BSME at the University of Central Florida. He continued on with Westinghouse and Siemens in roles of engineer and generator specialist before joining Calpine as a generator specialist. Now he is a Director of Outage Services, covering outage maintenance for Calpine’s diverse generator fleet, spanning over 200 units from fifteen different OEMs.
Committee member since 2018
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Jagadeesh Srirama
Senior Electrical Engineer, NV Energy

Srirama has worked in NV Energy’s power generation department for nearly three years as a senior electrical engineer. Previously, he was an electrical project engineer for CalEnergy Operations’ geothermal plants (more than four years), an electrical engineer in mining operations, maintenance, and design for Freeport McMoRan Inc (three years), and a maintenance technician for Aramark Facility Services.
Academics: BTech, Electrical Engineering, JNTU Univ (Hyderabad, India); MS, Electrical Engineering, South Dakota School of Mines & Technology.
Committee member since 2015
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Steering Committee Advisor:

Jane Hutt
Webmaster, International Generator Technical Community (IGTC)

Mrs. Hutt is the Webmaster for the International Generator Technical Community, an online technical forum for power plant engineers worldwide. She has worked in the power generation industry since 1996, focusing on technical media, both electronic and print. Prior to that, she worked in the construction industry as an editor and a public involvement‐communications specialist for major planning and regulatory contracts. In 2009, Mrs. Hutt was one the original team involved with development of the International Generator Technical Community forum site. She has been the webmaster for the IGTC site since its 2010 launch. Since 2012, she has spoken on and led panels on various aspects of Knowledge Transfer and Engineer Professional Development issues at power industry conferences and various engineering workshops, in the US and abroad. Mrs. Hutt is a member of IEEE and ASME, having served on various committees of interest to the power generation sector. She has also published conference papers on knowledge transfer and professional development: EEA New Zealand, 2012, 2014; CIGRE A1 Symposium, 2014; Carilec Engineering and Occupational Health & Safety Conference 2015.
Committee advisor since 2018
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Past Steering Committee Members:
Ryan Harrison, 2015-2020

Mission Statement of the Generator Users Group

The mission of the Generator Users Group (GUG) is to provide an opportunity for owner/operators of electric generators worldwide (initially 1500/1800- and 3000/3600-rpm machines) to share experiences, best practices, and lessons learned on design, installation, operation, maintenance, and overhaul. Expected outcomes are improved plant safety, maintainability, availability/reliability, and efficiency. The GUG also serves to effectively transfer industry knowledge from experienced engineers to those with less experience.

Due to the continued status of COVID-19, Power Users has chosen to not enter into contract negotiations with hotels for 2021 conferences. The existing 2021 hotel contract for 7F Users Group has been moved from May to August with the hope that we will be able to have an in-person conference by late August.

With that in mind, all groups under the Power Users umbrella have been offered the opportunity to co-locate with 7F Users Group at the Marriott St. Louis Grand in St. Louis, MO. This only applies to 2021.

GUG has elected to hold a virtual conference in 2021.

Open Virtual Conference Details

The Maughan Award recognition is earned by industry professionals who have demonstrated excellence throughout their careers in the design, construction, management, operation, and/or maintenance of generating facilities powered by gas and/or steam turbines.

2022 Maughan Award Nomination Form

Deadline to submit a nomination form is Friday, May 27, 2022.

Meet our Past Award Winners:

2019 Maughan Award Winner:

  • James E. Timperley, Director, EMSA Technical Services, Charles Taylor
2018 Maughan Award Winner:

  • Jane Hutt, Webmaster, International Generator Technical Community
2017 Maughan Award Winner:

  • Isidor (Izzy) Kerszenbaum, PhD, PE, Principal, Izzytech, LLC

Article written in CCJ-Online.com: https://www.ccj-online.com/issue-54/ccug-gug-stug-salute-users-for-their-leadership-and-contributions-to-industry-knowledge/

Conference dates: August 26-29, 2019

  • Annual Conferences (GUG, CCUG and STUG) and 2nd Controls Symposium (PPCUG) with shared meals and vendor fair
  • 193 Users – CCUG = ??; GUG = ??; STUG = ??; PPCUG = ??
  • 88 Exhibitors represented at Vendor Fair

Vendor Fair: Monday, August 26, 2019 – 88 Exhibit booths

Conference dates: August 27-30, 2018

  • Annual Conferences (GUG, CCUG and STUG) and 1st Controls Symposium (PPCUG) with shared meals and vendor fair
  • 217 Users – CCUG = 92; GUG = 47; STUG = 58; PPCUG = 20
  • 88 Exhibitors represented at Vendor Fair

Vendor Fair: Monday, August 27, 2018 – 88 Exhibit booths

Conference dates: August 28-31, 2017

  • Annual Conferences (GUG, CCUG and STUG) with shared meals and vendor fair
  • 172 Users – GUG = 49; STUG = 55; CCUG = 69
  • 76 Exhibitors represented at Vendor Fair

Vendor Fair: Tuesday, August 29, 2017 – 76 Exhibit booths

Conference dates: August 22-25, 2016

  • Annual Conferences (GUG, CCUG and STUG) with shared meals and vendor fair
  • 135 Users – GUG, CCUG and STUG attendees
  • 70 Exhibitors represented at Vendor Fair

Vendor Fair: Tuesday, August 23, 2016 – 70 Exhibit booths

Conference dates: November 3-5, 2015

  • 50 Users in attendance
  • 29 Vendors in attendance; No vendor fair




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