Yes, absolutely. So, the First Minister was very clear that what he was saying was that we couldn't do it as an emergency. So, we can't do it now, and that's absolutely right; we absolutely cannot. We do not have any of the supply chains, equipment, the skills or anything else to do it immediately. However, we've been working for the last several years through the innovative housing programme and the optimised retrofit programme to develop both the technologies and the fit for the houses, because we cannot emphasise enough—and you'll have heard me until you're all sick of hearing me say it—that each house requires to be retrofitted in the right way for that house and you cannot have a 'one-size-fits-all, shove air-source heat pumps into everything', for example; it doesn't work.
So, the optimised retrofit programme, which is being done on social housing because it's easier for us to work with people who have large numbers of houses to trial it on, will tell us, for each type of house in Wales, what works, and off the back of that we'll be able to develop the grant-assisted programmes and the skills in the private market to be able to allow people to access advice and guidance on how to do it. Because, at the moment, if you are an interested private sector owner-occupier, if you're lucky enough to be an owner-occupier, it is very difficult to get advice about how to decarbonise your house without being given very unsuitable, 'Just spray the outside with something or other', or whatever, and I know many people in this committee and others will have tried, and I know myself that it is very hard to access that. So, we are hoping to get those skills out into the market, to get businesses that go with those skills so people can start offering those services, and we will have Government-sponsored advice and so on to help people do that. But in order to do that, Jenny, we have to get to the point where we know what to advise people, and we don't know that for large numbers of houses yet. We've got tech being tried in a range of houses. We're testing that tech to make sure that it actually does what people claim for it, and I've seen some very exciting technology. If you follow me on Twitter, you'll have seen me going on and on about heated wallpaper the other day, which I was very excited by. But we need to trial that in real-life situations, and we need to test it, make sure it works, make sure it does what it's claiming to do and all that kind of thing. And once we know that, we can encourage the commercial manufacture of such things, and I would hope then to see it in your local DIY superstore. But we need to get there, and we need to learn the lessons. So, we did very well with the Welsh housing quality standard. We were told we couldn't do it; we have got the vast majority of houses in Wales up to EPC D from absolutely nowhere. We're now going to come out with the next programme. That will be informed by the tech trials that we've been doing through ORP. So, we'll be able to negotiate with our social landlords what they can do to their housing to bring it up to as close to EPC A as we can conceivably get it. There are some difficult decisions to make about housing that can't be brought up to standard and what do we do—the carbon footprint of demolition and so on, which have all got to be factored into these things. And then, off the back of that, we can start to roll it out.
There are other sectors that we will need to assist. I know, in your constituency, Jenny, and in my own, the private rented sector is a big player. We will need to make sure that there's the right incentives for landlords to be able to invest in their properties and so on to bring them up to standard without coming out of the market or disadvantaging the tenants. So, there's a lot of work to be done, and that's why we can't do it quickly. But we will be doing it. And the ORP results from the first two years are now starting to roll out, and we are beginning to see that. I also work very closely with both the education Minister and the economy Minister to get the skills programmes and the supply chain programmes in place to do that, so that we can do what we call a supply chain analysis to make sure that as much of that supply chain comes from Welsh companies as we possibly can make it, or, anyway, UK companies, and bring the carbon footprint of that down.
One of the things we're asked all the time is, 'Why not put photovoltaics on all the roofs in Wales?' Well, photovoltaics currently mostly come from China. I'm very interested in our global footprint. That's not what we measure. Net zero is about our own domestically consumed one. But what's the point of that if all you've done is export it elsewhere? So, we need to make sure we're doing this in a globally responsible way as well. And there have been exciting new developments in photovoltaics in our universities to produce them here, screen printed onto domestically produced steel and so on, which I'm sure all of you have been offered visits to. There's one down—to give a plug to my own home town—at Swansea University, where you can go and see the in-situ panels working. But can they be commercially produced? Can they be scaled up? Do they work over the long term, and all those kind of things? We need to test that out before we roll it out into people's actual homes, to learn those lessons. By the end of next year, we will have started rolling the tech out, because we will have two years of tech trial results coming out, and we can start to be reliant on, 'It really does do what it says on the tin', or, 'It doesn't'.