A petition to require data center developments in Yellowstone County to receive voter approval needed to deliver the requisite number of signatures three weeks ago, according to a memo released Tuesday by the Yellowstone County Attorney’s Office. Signature gatherers had been operating under a deadline of Aug. 12, a date provided by the Yellowstone County Election Department in June. Broadview-based Kassi Solberg spearheaded the Yellowstone County Ballot Initiative. The petition aimed to put language on the November ballot that, if passed, would require voter approval of any data center development in the county. The statute initially used by the election department applies to ballot certifications, while the latter applies to local initiatives.