South Africa said it would lower its carbon emissions to 34% below current expected levels by 2020 and about 42% below current trends by 2025.
"This undertaking is conditional on firstly a fair, ambitious and effective agreement," a South African government statement said.
"And secondly, the provision of support from the international community, and in particular finance, technology and support."
The government said developing countries such as South Africa would need financial help from developed economies, with some of the aid being used to acquire the technology needed to reach its target.
The country's chief climate negotiator Alf Wills told Reuters the offer was the first time South Africa had given a specific target for reducing its carbon footprint.
The government said international finance has helped South Africa to build new solar and wind-powered plants.
But construction has already begun on what is believed to be the biggest coal-burning power plant in the country.
The plant is aimed at meeting the country's increasing energy needs and avoiding a repeat of last year's rolling blackouts, which cost the country millions of dollars.
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