The SunSource Team

Kansas City's leader for solar installation, renewable energy, green architecture and more, SunSource can assist you with all of your residential or commercial building needs. Our experience in many areas within the architecture industry, including commercial projects, environmental design, passive solar design, energy storage, and solar PV systems have positioned us to serve as your sustainable construction, green remodeling, and renewable energy system company.


Keith Graepler – Principal

General Contractor, Sustainable Energy Specialist

Keith has a broad-based background in systems design and general construction. He lived in Colorado until 2008 when he moved to Kansas City. He has spent the last 9 years working with Renewable Energy systems design and installation, energy conservation in residential and commercial buildings, lighting system design for energy efficiency and light quality, energy auditing, geothermal GSHP system design and installation, advanced insulation techniques and wall assemblies, potable water filtration system design and installation, and Solar PV System design and installation. He has managed, designed, and supervised installation of Solar PV systems for a total of over 3.1MW since 2007 in Kansas, Missouri, Illinois, Colorado, Wyoming, Oregon, Minnesota, and Washington.

Motivated by the positive impact that SunSource has on the environment, Keith is passionate about future sustainable development opportunities all over the world!

Keith is a graduate of Solar Energy International (SEI).


Susan Turner

Business Development 

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Growing up in NW Iowa, Susan was raised to reuse, recycle, and conserve energy. She also lived in the middle of construction projects from her parents’ hotel renovations and later her own renovation/remodel projects. Her undergraduate degree was completed at Southern Connecticut State University, but after living on the East coast, she missed her Midwest roots and moved to Eastern Iowa.  She was a member of Rotary International, a volunteer for a historical museum and a local theatre, and sat on various county-related committees such as hiring a county marketing manager, and for her city’s new library construction project. This overlapped her 18 years in sales and technical support in computer services, a phone company, cable company, and point of sale installations. It was a natural inclination to latch onto Sun Source and use her many years’ experiences and knowledge in sales and construction. 


Susan has lived in the Kansas City area since 2005 and is a big promoter for this part of the Midwest. She has three children, enjoys cooking, yoga, and spending time with family.


Justin Castleman

Business Development Justin Castleman

Justin is a life-long Kansas Citian and earned his Bachelor’s Degree from Benedictine College.  Coming from a big family Justin quickly realized the importance conservation.  On non-work days you will find him tending to his lawn and landscaping, golfing, and spending time with his fiancé and 1 year old son.

Justin’s work background consists of many industries including construction, healthcare, and communications.  While in the construction industry in 2008 he focused mainly on masonry and waterproofing. In 2014 he entered the renewable energy industry with a desire to make a positive impact on the world.   Justin has designed and managed solar projects totaling 300KW and has been member of the NFPA since 2015.  He has solar experience in New York, Massachusetts, Rhode Island, Connecticut, New Jersey, California, Kansas and Missouri.  


Greg Hynes

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Solar Installation Foreman

Greg has a strong focus and commitment to excellence for himself and the Sun Source team. As the Solar Installation Foreman, Greg is an expert at communication in the construction field. He spends the extra time needed to effectively communicate with the customer and guarantee the work is of the utmost professional quality. Greg has the leadership skills, motivation, and dedication to go above and beyond the call to completely satisfy the requirements of professionalism and customer needs when SunSource is finished with your project.

Greg has spent the last 6 years as a crew foreman installing over 1,000,000 Watts of Solar PV systems in a variety of styles in Kansas and Missouri. Greg's work background includes masonry, excavation, landscaping, and HVAC.