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O’Fallon Renewable Energy Center (OREC)

O’Fallon, MO

Trusted Partner for First Solar Investment

Ameren Missouri’s first investment in solar energy production relied on PayneCrest to efficiently install all electrical needs for the O’Fallon Renewable Energy Center (OREC) in O’Fallon, Mo.  Spanning 22 acres, it is the largest investor-owned utility scale solar facility in Missouri. OREC features more than 18,000 solar panels in 75 rows to generate 5.7 megawatt of electricity, enough to power 650 average-size homes in the St. Louis area.  The project earned PayneCrest honors at the AGC Keystone Awards.

“For a project of this importance to Ameren Missouri and our customers, PayneCrest was an invaluable partner.” Scott Wibbenmeyer, manager of renewable development, Ameren Missouri.


Miles of cable


Solar panels


Feet of conduit


Wire terminations

Project Image
Project Image

Project Highlights

  • Thoughtful engineering modifications ensured optimal energy production 
  • Saved the project nearly $1 million and met all schedule milestones 
  • Educated and prepared an untested workforce on the nuances of building a solar energy field thereby developing skills that could be leveraged on future renewable energy projects  
  • Seamless commissioning that successfully achieved OREC’s production’s goal of 5.7 megawatts of power and satisfied energy production performance for the Missouri Public Service Commission
  • No injuries on the 11,000 manhour job 
  • Developed thoughtful solutions to overcome unexpected challenges, including an abundance of rainfall that challenged trench work.