Acumen has exited Tanzanian pay-as-you-go technology company KopaGas through Circle Gas’s $25-million acquisition of the company’s technology – the largest-ever pure private equity investment in the clean cooking sector.

Acumen is a not-for-profit firm in the venture capital and private equity space that invests in companies, leaders and ideas whose products and services are enabling the poor to transform their lives.

In a country where the vast majority of low-income hous...