Ofwat published on 30 April 2026 a document which sets out the Development and Commercial stage and Gate C requirements for projects in the Major Water Infrastructure Programme, explaining how project owners must demonstrate that a major water infrastructure project has matured sufficiently to proceed towards procurement or, for in-house delivery, transition out of the gated process. The guidance describes Gate C as the point at which Ofwat assesses readiness to commence procurement, with a focus on matters not already addressed through planning and consenting processes, including project design and technical scope, costs and benefits, programme management, environmental permitting, land acquisition, drinking water quality, digital twin development, customer and stakeholder engagement, board assurance, procurement strategy, risks, and baseline data. It distinguishes between publishable Part A materials and non-publishable Part B materials, with additional commercial, financial, market engagement, risk allocation, contractual, value-for-money and governance requirements for projects proceeding under Direct Procurement for Customers or the Specified Infrastructure Projects Regulations. The document also explains submission, query, assessment, transparency and information-sharing expectations, including publication requirements and Ofwat’s approach to determining whether projects may progress, whether procurement consent should be granted, and whether penalties or further actions are required.