Energy Pig is a Glasgow-based renewable energy company. Founded in 2015 by David Vincent Macneill, the company specialises in installing energy-efficient systems, including glazing, heating, insulation and solar solutions. Since its inception, Energy Pig has installed thousands of energy-saving products, aiming to reduce fuel poverty and carbon emissions. The company has grown from sales of £2.4m in 2022 to £10.4m in 2024.