This feasibility study has considered 3 main options for connecting tidal generation in the Severn Estuary to the National Grid Transmission System. The options considered are as follows:
- 8.64GW of generation located at the site for the Middle Barrage without transmission circuits across the Barrage (Option 1)
- 8.64GW of generation located at a site for the Middle Barrage with either AC or DC transmission circuits across the Barrage (Option 2 – AC; Option 2A – DC)
- 1.365GW of generation located at a site for the Inner Barrage
Each of the generation options described above has been assessed in detail considering system design issues, including identifying the required reinforcements to maintain the transmission system integrity and compliance. For each of the options; the high level investment costs, construction and consents issues involved in maintaining the integrity and compliance of the transmission system have been considered.