How Much Solar Energy Waste Do Homes Produce Without a Battery

Without a battery, a typical UK solar household exports about 50% of its clean energy back to the grid because generation peaks at midday while demand usually spikes in the morning and evening. While this surplus energy isn’t “wasted”—it supports the wider grid and can earn you payments through the Smart Export Guarantee (SEG)—it fails to offset your own expensive evening electricity imports. Adding a battery shifts this dynamic, allowing you to store that midday surplus for nighttime use, a trend that saw UK battery installations jump by 147% as homeowners sought greater energy independence.