Southwest Gas Holdings Inc.’s (SWX) systematic investment plans to strengthen infrastructure and accretive acquisitions should further boost its performance. Consistent customer additions to the company's natural gas segment are improving its financials.However, this Zacks Rank #3 (Hold) company faces risks related to its dependence on interstate pipelines for natural gas transportation.TailwindsSouthwest Gas strategically plans its investments to meet the growing demand for safe, reliable and affordable en ...