SHELL Plc has made a final investment decision to build a gas supply facility in Nigeria to feed a fertiliser plant owned by Africa's richest man Aliko Dangote, the company said in a statement. The new facility will supply 100 million standard cubic feet of gas per day from the Iseni field to the Dangote Fertiliser and Petrochemical plant for 10 years, according to the deal agreed by Shell and its joint venture partners TotalEnergies, Eni and the state oil firm NNPC Ltd. The $2.5 billion plant, Africa's largest urea complex with a 3-million-tonne output per year, accounts for 65% of Nigeria's…