pattern energy group lp (pattern development) was formed in 2009 by riverstone holdings. it and its newer sibling company, pattern energy group 2 lp (pattern development 2) are privately held. both companies seek out new opportunities for the development of renewable energy generation and transmission assets, from greenfield projects to pre-construction acquisitions. pattern energy has a right of first offer (rofo) for projects developed by pattern development and pattern development 2.