Did you not hear him say that there is a need for an alternative?
And it seems that may pretty much be here now.
https://www.bbc.com/news/science-environment-49567197"
The question of alternatives to SF6 has been contentious over recent years.
For high-voltage applications, experts say there are very few solutions that have been rigorously tested.
"There is no real alternative that is proven," said Prof Manu Haddad from the school of engineering at Cardiff University.
"There are some that are being proposed now but to prove their operation over a long period of time is a risk that many companies don't want to take."
However, for medium voltage operations there are several tried-and-tested materials. Some in the industry say that the conservative nature of the electrical industry is the key reason that few want to change to a less harmful alternative.
"I will tell you, everyone in this industry knows you can do this; there is not a technical reason not to do it," said Louis Shaffer from Eaton.
"It's not really economic; it's more a question that change takes effort and if you don't have to, you won't do it."
Each turbine would normally have contained around 5kg of SF6, which, if it leaked into the atmosphere, would add the equivalent of around 117 tonnes of carbon dioxide. This is roughly the same as the annual emissions from 25 cars.
"In this case we are using a combination of clean air and vacuum technology within the turbine. It allows us to still have a very efficient, reliable, high-voltage network but to also be environmentally friendly," said Costa Pirgousis from Scottish Power Renewables.
"Once there are viable alternatives on the market, there is no reason not to use them. In this case, we've got a viable alternative and that's why we are using it."
