She was addressing a media conference following a roundtable discussion with Business Unity SA (Busa).
"All South Africans must support the loan because 25 percent of people are still waiting to have access to basic minimum electricity," the minister added.
Her comments followed earlier reports that the UK government, due to call a general election soon, was under pressure to block SA's efforts to secure the US3.7b loan from the World Bank to construct the Medupi power station.
Chairman of Busa Raymond Parsons told the media conference that Busa was already on record as supporting the World Bank loan.
"It's part of Eskom's broader borrowing programme - Eskom has already obtained a loan from the African Development Bank," Parsons said.
"The World Bank loan at this stage is essential," he added.
Turning to questions about the ANC's involvement in the building of the Medupi power station through its 25 percent stake in Hitachi Africa via Chancellor House, Peters said that the issue should be addressed by the Treasurer-General of the ANC.
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