Southwest Gas Corporation, is a company. The Company consists of two business segments: natural gas operations (Southwest) and construction services. Southwest is engaged in the business of purchasing, distributing, and transporting natural gas for customers. NPL Construction Co., (NPL) a wholly owned subsidiary, is engaged in construction services. NPL is a service underground piping contractor that provides utility companies with trenching and installation, replacement, and maintenance services for energy distribution systems. The primary focus of NPL operations is distribution pipe and service hook-up replacements as well as line installations for new business development for small projects and entire communities.