Black Hills Energy Buys Gas Office (NWA Real Deals) by Marty Cook Posted 11/26/2018 12:00 am Updated 6 months ago The 655 E. Millsap Road site was the home of Source Gas, the natural gas utility bought by Black Hills in 2016. The office and site cover more than 3.5 acres. Want the Full Article? Get Unlimited Archive Access for $19.95 per Year Readers must pay to access articles older than 15 days. Articles newer than 15 days are not included in this offer. Purchase Now Already have archive access? Login to view this article.