Lord Cameron of Dillington (CB)

My Lords, I ought to report on Amendment 111 in the name of the noble Lord, Lord Offord. The assessment of the effects of offshore wind farms on the environment, with particular reference to sea-birds, has been ongoing for some years now. That does not necessarily undermine the future of the amendment, but it indicates that it might not be necessary. The UK Centre for Ecology & Hydrology—the CEH—has been monitoring sea-birds in the North Sea since the 1970s. It largely studies birds on the Isle of May, just off the coast of Fife, but also sea-birds up and down the east coast of Britain. Over the past decade, these studies—largely funded by wind power operators, but also by the Scottish Government, the RSPB and others—have been extensively monitoring the effects of offshore wind farms on sea-birds. Admittedly, having to cope with and discount the simultaneous effect of bird flu has meant that this has proven a very complicated exercise recently but, with bird flu now on the wane, colonies of sea-birds seem to be flourishing in spite of the growth of offshore wind farms. The jury is still out, but the effect of these farms seems pretty low compared to that of bird flu and the new climate change-induced phenomenon of marine heatwaves. The latter winter current changes affect the growth and presence of sand eels, which are hugely important to the winter diet of many sea-birds. The point is that the bottom tip of a marine turbine blade is 30 metres above sea level. That is pretty high and nearly all sea-birds fly below it. Kittiwakes are the notable exception but, even here, the CEH is helping the wind farm operators to examine how to minimise their losses. One solution is to paint one of the three blades black, which seems to have a beneficial effect. It is also helping to mitigate overall losses by building artificial nesting sites for kittiwakes on the Yorkshire cliffs, for example. The intention is that the overall kittiwake population should not be affected. It is possible—and the jury, as I say, is still out on this—that offshore wind farms actually help sea-birds flourish. Most birds thrive relatively well during summer months, but they suffer and sometimes die from lack of food in winter months. While the recent cessation of sand-eel fishing by UK fishing boats has helped—they are now not allowed to fish for sand-eels—the Danes continue this practice in considerable quantities. However, neither the Danes’ nor other fishing boats tend to fish inside wind farms for fear of snagging their nets. Thus, wind farms have become a sanctuary for sand-eels and other fish and could therefore be having a beneficial effect on the overwintering of sea-birds. But, as I say, the jury is still out. The environmental assessment of offshore wind farms is already happening, is based on data going back to the 1970s and seems to indicate so far that their environmental effects are not hugely harmful.