This Cambridge firm provides pay-as-you- go solar power to households in sub- Saharan Africa. During the pandemic, its devices helped children in rural areas of Kenya access lessons broadcast by the education ministry while schools were closed. Launched in 2012, the company has sold more than 200,000 solar panel systems to customers in 12 countries, including Tanzania, Uganda and Nigeria, through a network of local agents, 50% of whom are women. Customers are charged in weekly instalments and, once paid for, all future energy is free. Led by chief executive Simon Bransfield-Garth, 60, it reached sales £12.4m in 2019.