The time it takes to recoup the investment in a solar power installation in the UK varies based on factors such as system size, energy consumption, and available incentives. On average, homeowners and businesses often experience a payback period of around 6 to 10 years for solar installations in the UK. Government incentives, like the Feed-in Tariff (FiT) and the Smart Export Guarantee (SEG), can contribute to quicker returns on investment, making solar power installations in the UK an economically viable and sustainable choice over time.