Compressed Air Best Practices, Oct. 2016, by Mike Robinson.
https://www.airbestpractices.com/industries/food/advantages-onsite-nitrogen-generation-brewers

"Although the basic principles behind brewing are little changed since their advent, the technological aspects are much improved. Today, large stainless steel tanks are used for fermentation and wort aeration, and complex, automated systems help with everything from temperature regulation to bottling. A price tag comes with these high-tech systems, and it’s not insignificant. By using onsite nitrogen generation, brewers can save significant amounts of money throughout the life of their operation."