The noble Lord has asked me about this a number of times. As I have said to him, we are supportive of tidal power and are allocating funds to its development through the various CfD auctions. But I think he will recognise that it is not yet available at scale and in the quantities we would need. We are very proud of our renewable resources: almost 50% of our electricity production is now from renewables; we have the five biggest wind farms in the world; we are easily the biggest producer in Europe; and we are seeing lots of applications for solar development. Renewables are great, but it remains the case that they are not available all the time; we need more storage and back-up, and need other sources as well.