IEC 61400 guides the certification of all aspects of large and small wind turbines. Everything from the structural integrity and power performance to acoustics and manufacturing is covered and requires third-party companies like UL to do the evaluations. A subset of the international certification process is the US Small Wind Certification that Wind Harvesters 4.0 will undergo at the UL Advanced Wind Turbine Testing Facility in Texas in 2023.  The full process should take 6-9 months to complete.