Our Staff & Board
STAFF
Mark R. Stover | Executive Director
Mark Stover serves as the Executive Director of TSSA. He joined the association in May 2024. Prior to joining TSSA, Mark served on the association’s board of directors and was its secretary.Before TSSA, Mark led government and regulatory affairs activities in ERCOT and SPP for Apex Clean Energy, a national leader in utility-scale wind, solar, BESS, and green hydrogen development, construction, and operations. Mark holds over 25 years of external affairs experience in the electric power industry. Prior to joining Apex in 2017, he ran a consulting practice focused on renewable energy policy and project development. From 2008-2014, Mark served on the management team of a privately funded renewable energy company, Hydro Green Energy (HGE), where he was Vice President of Corporate Affairs. From 2006-2008, Mark worked at Good Company Associates in Austin, TX, where he provided a variety of consulting services to clients in the renewable energy, demand response, and energy efficiency sectors. Mark’s career began in 1994 in Washington, DC, where he spent 11 years working at three national trade associations, including the Electric Power Supply Association (EPSA) and the National Hydropower Association (NHA), where he ran legislative, regulatory, and media activities. Mark graduated from Syracuse University, where he studied political science and foreign affairs. He left DC for Austin in 2005.Director of Legislative Affairs
Currently vacant
TSSA Board Officers
President
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Susan Williams Sloan shapes Ørsted’s legislative and regulatory agenda for the company’s North American Onshore business. Orsted’s US portfolio consists of more than six GW of wind, solar and battery energy storage projects in operation or under construction. Susan is a Texas native with deep experience in the renewable energy industry, including 15 years with the American Wind Energy Association (now American Clean Power Association), where she built and led its national State Affairs program. After staffing city and state elected officials early in her career, Susan has worked overseas, nationally, and in Texas in the intersection of public policy and corporate affairs.
Vice President
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Tammy Kelch Embrey leads government affairs in Texas for Invenergy, a leading privately held developer and operator of sustainable energy solutions. Tammy has over 20 years of public affairs experience at the local, state, and federal level working for government, trade associations and private industry. Tammy earned her degree in Agriculture Economics from Texas A&M University and enjoys all the benefits of living near the Texas Coast in Corpus Christi.
Secretary
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Bob Helton is the Director of Government & Regulatory Affairs for Engie North America and has 30 years of experience in the electric industry. He is responsible for developing regulatory/market design policy in support of Engie retail/wholesale business development and market activities within the Electric Reliability Council of Texas (ERCOT). This includes extensive participation and advocacy in the Legislative, ERCOT stakeholder and Public Utility Commission of Texas (PUCT) processes for the development and modification of the ERCOT retail and wholesale market design and protocols. Bob holds a Bachelor of Science degree in nuclear science from the University of Maryland at College Park.
Treasurer
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Justin serves as RWE’s Senior Manager of State Government Affairs for ERCOT and the Southwest Power Pool.
RWE is the third largest renewable energy company and the second largest solar owner and operator in the U.S., with a renewable energy portfolio of over 11 gigawatts (GW) of installed capacity including solar, battery storage, and onshore wind.
Justin has over 13 years of experience in government relations in Texas, serving for various elected officials and state agencies. Justin graduated from Texas State University - San Marcos. He lives in Austin, TX.
At-Large Executive Committee Members
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Timothy Heinlejoined OCI Energy (formerly OCI Solar Power) in 2017 and currently serves as the company’s Executive Vice President of Business Development.
OCI Energy is the first utility-scale solar project developer in Texas and a founding member of TSPA.
Timothy has more than 25 years of experience in the independent power sector, having worked in development roles for EDF RE, Siemens, Community Energy, Magellan Resources, and Duke Energy.
Timothy received his bachelor's degree in Government from Georgetown University and his MBA from the College of William & Mary
At-Large Executive Committee Member - DER
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Amy Heart is Senior Vice President of Public Policy with Sunrun. Sunrun is the nation’s leading provider of residential solar and battery solutions. Amy leads Sunrun’s policy team, working to protect and expand access to home solar and battery solutions, and leverage these benefits to help our overall grid. Prior to joining Sunrun's policy team in 2014, Amy worked to deploy customer-centered solar solutions with municipalities and non-profit organizations. Amy Heart received her law degree from Marquette University Law School.
TSSA Board of Directors
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Aaron Helton oversees Government Affairs in Texas, Oklahoma, and Arkansas for Cypress Creek. He leads the company’s engagement with elected officials and works closely with regulators, including the Public Utility Commission of Texas and other state agencies. Prior to joining Cypress Creek, Aaron spent five years as a district staffer for a member of the U.S. House of Representatives, focused on community and state engagement in Texas, before serving as Deputy Chief of Staff in Washington, D.C. He is a graduate of Texas State University’s McCoy College of Business with a degree in Economics and is based in the Austin area.
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Hannah Muller is Senior Director of External and Market Affairs, covering the East and Central regions for Clearway. Hannah leads Clearway’s engagement with state and local policymakers, FERC, RTOs/ISOs, and other key stakeholders working to update America’s electric grid and build a resilient, renewables-centric energy system. Prior to entering the private sector, Hannah spent 3 years at the advocacy group Vote Solar, helping run solar campaigns in the southeast and establish community solar markets nationwide. She also spent 5 years at the U.S. Department of Energy solar office, where she managed the Solar America Cities program to jumpstart solar growth in 25 major U.S. cities. Hannah holds degrees in Environmental Policy and Political Economy from UC Santa Barbara and Clark University. She is based in upstate New York.
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Lynnae Willette serves as Director of Regulatory & Legislative Affairs for EDF Renewables. Lynnae leads the policy strategy and implementation for ERCOT, SPP, SERC and several Intermountain West states. She also works closely with her team on Federal policy. Lynnae is a licensed Texas attorney, earning her JD from South Texas College of Law.
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Francisco Enriquez is the founder and CEO of Fractal Power, a vertically integrated energy infrastructure company. Before founding Fractal Power, Francisco co-founded Adaptive, a market-leading software company for the construction industry and a CB Insights Top 100 fintech. Prior to Adaptive, he served as a Managing Director of a Texas-based think tank focused on infrastructure, economic development, and regional planning. Francisco holds a B.S. in Neuroscience from the College of William & Mary and an MBA from the Stanford Graduate School of Business.
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Barb Jacobs is director of government relations at Lightsource bp and leads state-level legislative and regulatory advocacy for the company. She has almost two decades of government affairs, advocacy, policy, and non-profit leadership experience. Prior to joining Lightsource bp, Barb covered state legislative and regulatory affairs for the eastern interconnect at Avangrid Renewables, worked for an energy policy think-tank at the University of Minnesota, and as lead committee staff in the Minnesota Senate helped pass landmark solar legislation in 2013. Her many other titles over the years have included board chair, writer, oyster farmer, machinist, flight attendant and short-order breakfast cook. Barb lives in Minneapolis, Minnesota with her spouse and two young children and has a Masters of Public Affairs from the Humphrey School of Public Affairs at the University of Minnesota.
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Caitlin Smith, Vice President of Policy and Corporate Communications for Jupiter Power, is an energy professional with thirteen years of experience in electricity market policy, regulatory and government affairs. For the last ten years, she has focused on electricity market design and has worked both as an advocate for policies that enhance competitive energy markets and as an advisor on the commercial and financial impacts of energy policy. In her current role, Caitlin has responsibility over Jupiter Power's policy positions related to the commercial operations of utility scale energy-storage in power markets throughout North America and leads the company’s corporate communications and public relations.
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David Minor is the U.S. Operations Manager for the solar division at PCL Construction. David has over 25 years of experience working in the energy sector, of which his last 14 years have been spent working in renewables. David is renowned for being a forward-thinking leader and has found continuous success with integrating new technologies and product systems into the design-build of utility-scale photovoltaic power stations. David actively collaborates with industry partners to stimulate new approaches and techniques for the design, construction and ongoing management of utility-scale solar solutions. David is a graduate of Brock University, where he studied business administration and finance.
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Josh Cherry is a Senior Manager, Energy Storage Systems with Treaty Oak Clean Energy. He leads the development of Treaty Oak’s standalone BESS portfolio, including Texas, and acts as a technical subject matter resource for BESS for the company. Prior to joining Treaty Oak, Josh performed Electrical Engineering for EPC Burns & McDonnell. Josh also has utility experience with Southern Company Services and Georgia Power. Josh graduated from the Georgia Institute of Technology College of Engineering with a B.S. Electrical Engineering. Josh is based in Denver, CO.
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Susannah leads Government and Regulatory Affairs for Vesper Energy. She leverages over 20 years of expertise in energy policy and regulation, business development, stakeholder relations, and business strategy to represent the Company’s interests in state and federal initiatives.
Susannah has successfully led initiatives to advocate for legislative and regulatory policy, secure favorable outcomes in regulatory proceedings, and forge strategic partnerships that drive innovation and sustainability in the industry. Her approach comes from years of practical application of energy policy and regulation while working for Xcel Energy, the U.S. Department of Energy’s National Renewable Energy Lab (NREL), and before that, as a public and private sector city planner.
During her time at NREL, Susannah served as a U.S. delegate to the International Energy Agency, where she analyzed and reported to 21 other member countries on the status of U.S. photovoltaic research, manufacturing, installation, federal and state policy, and regulatory matters.
Susannah received a Bachelor of Science in Landscape Architecture from Purdue University and a Master of Business Administration from the University of Denver’s Daniels College of Business.