Aliko Dangote, Africa’s richest man from Nigeria, plan to invest about $16 billion over the next four year through his holding company, Dangote Group, Bloomberg reported.

The company will be seeking to increase its investments in cement, petrochemicals and agriculture over the next four years, boosting expansion in areas it has already invested.

“We are investing $4.7bn to finish our projects in cement in about 18 countries, including Nigeria,” Dangote told Bloomberg. “We are also spending about $2.3bn on agriculture, which is sugar and rice.”

The investment will help the Lagos-based company grow by almost a third next year, Dangote added. He is worth $22.1bn, according to the Bloomberg Billionaires Index, making him the world’s 34th richest man.

“We are very, very optimistic for 2014 — we are expecting average growth of 30% groupwide,” he said.

Dangote Cement said in April it plans to double annual total cement output to 55-million metric tonnes by 2015, boosted by new production in Cameroon, Zambia and South Africa. Dangote Sugar, which plans to start exports to Liberia, Senegal and Mauritania next year, aims to almost double refining capacity to 2.75-million tonnes by 2017 and increase sugar crop production, CE Abdullahi Sule said in August.

“We are going to do a backward integration for rice” by growing the crop and distributing it, Dangote said.

“We think Nigeria can be self-sufficient in rice in the next three to four years.”

Dangote plans to invest in a natural gas power plant to help provide electricity to Africa’s most populous nation, where a supply of 4,000MW of electricity is less than half of demand.

Nigeria also relies on motor fuel imports to meet more than 70% of its needs. “The only new investment we are looking at is upstream: to look for gas to secure our future businesses,” Dangote said. “We want to step in and make gas available, and this will translate into more stable power in the country.”