Ann: Tanzanian Update on Nachu Graphite Project, page-59

I recall this regarding gas from back in April 2017:

He said the government in cooperation with the Tanzania Petroleum Development Corporation (TPDC) was implementing a special project to transport natural gas to Dangote Factory in Mtwara as the facility required at least 45 million cubic feet of natural gas.

"Moreover, the government is having talks with the management of Uranex Factory in Mtwara Region so that it could also be connected to a natural gas supply network," he added.

http://allafrica.com/stories/201704060376.html