Question to the Department for Energy Security & Net Zero:

To ask the Secretary of State for Energy Security and Net Zero, pursuant to the Answer 19 March 2025 to Question 37370 on Infrastructure, what the evidential basis is for his decision to raise the solar threshold for Nationally Significant Infrastructure Projects from 50MW to 100MW.

Last year, the Government held an 8-week consultation which included a proposal to increase the Nationally Significant Infrastructure Projects threshold for solar. Consultation responses, sector engagement, and internal analysis contributed to the decision to increase the threshold to 100 megawatts.

Evidence suggests the current threshold is no longer reflective of improvements in panel efficiency, with contemporary solar projects covering less area per megawatt yield. Increasing the threshold ensures mid-sized projects have access to a more proportionate planning route, while also addressing the market distortion of projects capped at 49.9 megawatts, allowing sites and grid connections to be used more efficiently.