The Global Impact Challenge supports British non-profits using tech to tackle the world's toughest problems. The 10 finalists are in, help decide who wins.Project:SolarAid will scale access to solar lighting in off-grid communities in Africa by establishing a distribution network with local entrepreneurs.Impact:Over 110 million households in rural Africa rely on kerosene lamps, which emit harmful smoke and can cost up to 20% of a household's income. A £5 solar light lasts 5 years and is just 2% the cost of kerosene. SolarAid plans to work with Tanzanian entrepreneurs to create a solar hub for their communities, offering affordable, clean lighting, and providing job opportunities. Over 3 years, solar lighting will reach 11.2 million people, saving up to £196 million in income and reducing respiratory illness. Ultimately, SolarAid aims to replace kerosene lamps in Africa by 2020.Get involved:Cast your vote by the 31st May on https://globalimpactchallenge.withgoogle.com/ for the £500,000 fan favourite Global Impact Award.