Great summary article

https://www.climaterealityproject.org/blog/ethane-cracker-plants-what-are-they

Shell Chemical Appalachia's ethane cracker facility under construction in Monaca, Pennsylvania in April 2019. AP PHOTO/GENE J. PUSKAR

Beaver County, PA

Thought to be the biggest construction site in the country

$6 - $10Billion

https://www.heraldstaronline.com/news/local-news/2020/03/royal-dutch-shell-suspends-construction-on-beaver-county-cracker/