The Systems Integration team works to enable the safe, reliable, and cost-effective integration of solar energy on the nation’s electricity grid, developing solutions that ensure compatibility with existing infrastructure while enabling a smooth transition to a secure and resilient grid of the future. The Systems Integration team collaborates with other U.S. Department of Energy (DOE) offices as part of the DOE’s Grid Modernization Initiative.

Dr. Guohui Yuan, Systems Integration Program Manager

Guohui Yuan Portrait

Dr. Guohui Yuan is the program manager for the systems integration (SI) subprogram. His team supports research, development, and demonstration of technologies and solutions to enable the widespread deployment of solar energy on the nation's electricity grid.

Dr. Yuan has been supporting SETO as a technical advisor since 2011. Previously, he held several key positions at industry-leading clean technology startups, including CURRENT Group, GridPoint, and WaveCrest Labs. Early in his career, he worked at COMSAT Labs as a systems scientist. He is a recognized thought leader and has many technical publications. He holds nine patents.

Dr. Yuan holds a B.S. degree from Tsinghua University, Beijing, China and a Ph.D. from the University of Maryland, College Park, both in physics.

Shay Banton

Shay Banton SETO Headshot

Company: Boston Government Services

Shay Banton (he/him) is a technology manager for the Systems Integration team, joining the Solar Energy Technologies Office in December 2020. Prior to this role, he was a utility electrical engineer for Borrego focused on accelerating the deployment of renewable energy through informed technical policy development. During his time there, Shay served as the New York State Solar Energy Industries Association (SEIA) industry liaison, led the development of various statewide interconnection stakeholder groups, and supported various regulatory dockets and tariff modifications to ensure accurate representation of technical limitations in interconnection policy. Prior to Borrego, he worked for the Northern Indiana Public Service Company as a substation design engineer.

Shay received his B.S. in systems science and engineering from Washington University in St. Louis in 2015. He has an Engineer-in-Training certification and is currently working towards becoming a registered Professional Engineer.

Kemal Celik

Company: ManTech International

Kemal Çelik joined the Systems Integration team in 2015.  He started working at PG&E in San Francisco after completing his graduate studies in 1991.  He worked as a Vice President of Product Management at Nexant for 18 years until recently moving to D.C.

Kemal has more than 25 years of professional experience working on a wide range of projects from analytical electric distribution and transmission network applications to web-based demand-side management applications, energy market solutions and distribution planning tools. He worked on electric utility control center applications as well as computer modeling, coding, and implementation of analytical algorithms for power transmission and distribution networks. Kemal managed the development and implementation of several enterprise applications for demand-side management and energy efficiency programs at several different utilities; transmission revenue auction markets at Independent System Operators across the U.S.; and most recently a quasi-static time series near real-time analysis tool for distribution networks.


Patricia Clark SETO Portrait

Company: Allegheny Science and Technology

Patty Clark is a financial program analyst for the Solar Energy Technologies Office, supporting both the Concentrating Solar-Thermal Power (CSP) and Systems Integration (SI) teams.  Her job consists of budget planning, conducting financial compliance reviews, and invoicing and managing all financial reporting within the CSP and SI portfolios.

Patty has over 25 years of experience in the steel manufacturing industry with a background in energy efficiency, project management, and supervision of electrical engineer and electrical maintenance.

Patty received her BSAS in electrical engineering technology from Youngstown State University and her MBA from Lamar State University in Beaumont, Texas. She recently acquired her Professional Project Management Certification from Project Management Institute. Patty also has a six sigma black belt for professionals with an emphasis on lean manufacturing.

Tassos Golnas

Tassos is a Technology Manager for the Systems Integration team, joining SETO in April 2016. His primary focus is solar power forecasting as a means for cost-effective integration of PV in the electric grid. As part of his responsibilities he oversees projects in the areas of solar resource assessment, PV system modeling, performance, monitoring, and reliability. He is also keenly interested in applications of blockchain technologies in transactive energy and retail electricity markets. Previously, he consulted for the World Bank Group. His solar career began at SunEdison where he worked as the Senior Manager of the Energy Analytics group, which developed algorithms for event detection, power forecasting, and inverter control, and generated analyses on power output variability and system reliability. He later became the Director of the Performance Analytics group, with responsibility for all performance reporting, analysis, and optimization. Prior to SunEdison, he worked for seven years in the semiconductor equipment and photonics industries as an R&D manager and engineer.

Tassos came to the U.S. in 1994 to earn a Ph.D. in Materials Science and Engineering at Stanford University. He lived in the San Francisco Bay Area until 2003, before moving to Chicago, and finally to Maryland in 2007. He holds a B.S. is in Physics from the Aristotle University in Thessaloniki. He has authored eleven papers on PV system analysis and holds four patents in sensors and process integration.

Rodney Kizito

Rodney Kizito Headshot

ORISE Science and Technology Policy Fellow

Dr. Rodney Kizito is an ORISE Science and Technology Policy Fellow for the U.S. Department of Energy’s Solar Energy Technologies Office (SETO). He joined SETO in March 2021 and works on the System Integration team. Prior to this role, he worked as a graduate student researcher for the Ideation Laboratory (iLab) at the University of Tennessee, where he developed optimization models for solar-plus-storage utility-scale microgrids. During his time with iLab, he also worked as a researcher for the National Nuclear Security Administration, where he developed machine learning models for predicting failure and remaining useful life of equipment.

Dr. Kizito received his B.S., M.S., and Ph.D. in industrial and systems engineering from the University of Pittsburgh, University of Arkansas, and University of Tennessee, respectively. While earning his M.S. degree, he researched the investment economics of residential solar and storage systems.

Jeremiah Miller

Jeremiah Miller is a Technology Manager for the Systems Integration team, joining in October 2016. Prior to this role, Jeremiah was a senior power systems smart grid analyst for Smarter Grid Solutions, where he worked with European and North American utilities to support massive wind and solar energy deployments on distribution grids via grid-edge automation controls that enable the dynamic grid hosting capacity. Through this work, he supported enabling transactive grids, community microgrids, and utility of the future efforts in New York’s Reforming the Energy Visions (REV). Prior to this, he was a solar ombudsman in New York City where supported market transformation and resilient distributed generation through streamlined permitting, distribution system capacity mapping, and innovative power electronics and energy storage applications.

Jeremiah is a registered Professional Engineer since 2013, having worked in the solar, energy efficiency, energy storage, semiconductor, precision manufacturing, naval nuclear, and natural gas industries. He has a Master’s degree in energy and environmental policy from University of Delaware, where he was an NSF IGERT fellow for sustainable energy from solar hydrogen, and an M.S. and B.S. in mechanical engineering from Pennsylvania State University and Kansas State University respectively.


Marissa Morales-Rodriguez SETO Portrait

Dr. Marissa Enid Morales-Rodriguez is a scientist, native of Puerto Rico, working as a systems integration technology manager for the U.S. Department of Energy Solar Energy Technologies Office (SETO). Marissa joined SETO in 2021 and manages a portfolio of energy technologies supporting the research and development of high impact technologies and solutions that enable the reliable, resilient, and secure integration of solar energy on the nation's electricity grid.

Prior to this role, she served as a principal investigator and project manager at Oak Ridge National Laboratory (ORNL) for over 10 years. Her research focused on the development of advanced cyber-physical sensors, communications, and controls to increase security, reliability, and resilience of the power grid and energy systems. Her research also included the investigation of blockchain technologies for operational technology data security. During her tenure at ORNL, she participated in a multi-lab effort on disaster restoration where she led an effort to investigate low-cost sensor networks to understand islanded power systems. 

Marissa received a B.S. and M.S. in science from the department of chemistry at the University of Puerto Rico at Mayagüez, where she focused in semiconductor research and remote sensing technologies. She received her Ph.D. in energy science and engineering from the University of Tennessee, Knoxville. Marissa is the author/coauthor of many peer reviewed publications, recipient of two U.S. patents, and winner of a 2019 R&D 100 Award.

Robert Reedy

Robert Reedy Headshot Image

Company: Boston Government Services 

Robert (Bob) Reedy joined the Systems Integration team of SETO in January 2020. Prior to his role, he served as an associate instructor in the Electrical and Computer Engineering department and program director for grid integration at the University of Central Florida (UCF). His involvement with solar energy began as the director of systems research at the Florida Solar Energy Center (FSEC) of UCF in early 2007.

Previously, he spent four years with Georgia Transmission Corporation as a research manager and then as the manager of transmission line design. He also served as vice president and chief operating officer of the North American subsidiary of Turbec AB, a Swedish manufacturer of microturbine combined heat and power systems. Other experience includes marketing manager for The Energy Authority, Incorporated and most of his 23 years with the Lakeland Department of Electric and Water Utilities as director of the engineering and operations group. This earlier work has given him extensive experience in the larger utility industry with a technical focus in system protection and control, and operations and distribution design, with responsibilities in energy marketing, financing, and business planning. Most recently, Bob has been heavily involved with the control and protection of grid-interactive photovoltaics and storage, with particular attention to the enhancement of grid stability, reliability, and resiliency through utility control of advanced distributed inverters.

Bob earned his Master of Science in Electrical Engineering and Bachelor of Electrical Engineering from Auburn University, following the power systems analysis track. He later received an MBA from Florida Southern College, with a focus on production economics. He is a Licensed Professional Engineer in Florida.

Thomas Rueckert

Tommy first became interested in solar energy when his professor at Brown University introduced him to the book, Soft Energy Paths, by Amory Lovins, founder of the Rocky Mountain Institute. Tommy also shared news articles about a solar "Power Tower" that was being built in the Mojave Desert—what later became Solar One—which inspired him to do his college research project on heliostat design.

Tommy joined the Energy Department right out of college, and spent 14 years in the Federal Energy Regulatory Commission before joining the Solar Energy Technologies Office (SETO) in 1994. Having jobs ranging from solar budget manager to operations lead to concentrating solar power (CSP) lab research and development manager, Tommy currently serves as a technical project officer.


John Seuss SETO Portrait

Company: Boston Government Services

Dr. John Seuss is a technology manager for the Systems Integration team, joining the Solar Energy Technologies Office in February 2020. Prior to this role, he was a research and development engineer for S&C Electric Company in Chicago, IL. There he developed new distribution automation and protection schemes for medium-voltage switchgear and protective relays. In this capacity, he contributed to the discussion on the role of adaptive protection in future distribution networks with changing topologies and high penetrations of distributed energy resources. John began his career in power systems as a high-voltage substation field engineer, deploying and testing transmission and distribution relay protection schemes.

Dr. Seuss received both his Ph.D. and B.S. in electrical engineering from the Georgia Institute of Technology, where he researched the impact of inverter-based resources on power systems and how different control schemes for smart inverters can maximize the ability of distribution feeders to host photovoltaics. He received his M.S. in electrical engineering from the University of Central Florida, with a focus in control systems, where he also researched photovoltaic system integration.

David Walter

David Walter Portrait

David Walter is a technology manager for the Systems Integration team, first joining SETO in December 2016 on the Technology to Market team. He is interested in providing resiliency to the grid by dynamically optimizing operations and leveraging utility, commercial, and residential solar energy systems. He manages a variety of projects with focus on power electronics, smart communities, operations and maintenance, and codes and standards. David also plays an integral role in the management of the office’s Small Business Innovation Research and Small Business Technology Transfer (SBIR-STTR) program.

Prior to joining DOE, David was a senior engineer for Hartford Steam Boiler Inspection and Insurance Company, where he evaluated solar and wind installations for risk exposures from fire and operational issues, as well as provided energy yield analysis. Prior to that, he was the mechanical section leader and a pilot for the deep submergence vehicle Alvin at Woods Hole Oceanographic Institution, performing research globally in depths up to 4500 meters.

David is a registered Professional Engineer and Project Management Professional, having worked in the solar, energy efficiency, deep sea research, and naval nuclear. He has a B.S. in Ocean Engineering from the United States Naval Academy, having served in the U.S. Navy as a Lieutenant and Assistant Engineer on USS Alabama, a nuclear powered ballistic missile submarine.