The amendments let Proterra's River Energy South Africa undertake BCB projects in South Africa using its own funding arrangements in return for royalties payable to the River Energy Joint Venture, which is 51% owned by White Energy.

White Energy said it retained the ability to participate in the funding of future BCB opportunities in South Africa.

"White Energy is assisting Proterra in the design of a small demonstration plant to facilitate a commercial scale trial for a South African Power producer and other BCB trials in South Africa," it said.

"A South African coal producer has agreed to provide coal fines from one of their mines for briquetting trials at the plant when built."