Professional Experience:
One Tumelo is an accomplished sustainability and energy management professional with over nine years of progressive experience, primarily in the mining and environmental consulting sectors. As an Energy Manager at Debswana Jwaneng Mine, one of the biggest diamond mining operations in the world, Tumelo spearheads energy efficiency and decarbonization projects. In this capacity, her oversees OPEX and CAPEX energy budgets, develops and implements carbon reduction plans in line with Debswana's Net Zero objectives, and makes sure that all regulations, including ISO 50001, are followed.
Tumelo promoted the integration of renewable energy technologies, including a 3% solar project, while working as the Energy Management Coordinator prior to being promoted to Energy Manager in 2024. Her oversaw staff engagement programs, trained more than 150 workers, and encouraged a 10% rise in energy-saving techniques. In keeping with her history of advancing low-carbon technology, Tumelo played a key role in the start of experimental projects involving biodiesel and electric cars.
Tumelo previously worked at the same mine as the Environmental Coordinator (2019–2024), where she reduced waste and resource consumption by 85%. Under De Beers' Building Forever and Circularity programs, she successfully led projects and conducted more than 15 environmental awareness training sessions. Her efforts greatly reduced the mine's environmental impact by concentrating on risk management, compliance, and operational sustainability.
Based on technical prowess and strategic vision, Tumelo's career shows a trajectory of growing leadership and responsibility. She has continuously shown that she is capable of leading multi-stakeholder sustainability projects, managing cross-functional teams, and producing quantifiable outcomes in resource efficiency, emissions reduction, and environmental stewardship. She has led pyrolysis projects and overseen continuous recycling projects involving tires, HDPE pipes, and conveyor belts—integrating circular economy principles while empowering local communities—and has been recognized as a De Beers Circularity Champion.
Tumelo is a seasoned professional with experience in environmental science, energy policy, and project management who is well-positioned to spearhead challenging sustainability transitions, especially in industries with high resource consumption. Her work is a prime example of a results-oriented strategy based on creativity, teamwork, and a strong dedication to environmental integrity.