Yes, so, that's a really complicated issue, Carolyn. So, what we're doing is we're running out the optimised retrofit programme with our social housing providers. We have a number of them on board with that. What we're doing, as I think I said before in answer to you, is we're basically trialling a series of interventions and techs in each type of house. So, quite clearly, what suits a Victorian stone terrace halfway up a valley isn't going to suit a ranch house built in the 1970s in outer Swansea, for example. And we have a very, very large number of different types of housing and different aged housing in Wales.
So, what we're doing is, we're running a programme to make sure that we understand what best fits each type of house. And I think it was Sam who said that he lives in an old house; I live in an old house too, and I can tell you, because I've tried very hard, that it's very hard to find somebody who can advise you as to how to bring your home up the EPC ratings if you live in an older house. And so, what we're doing is we're trialling that, de-risking it for people and we're also doing it in conjunction with economy and education colleagues, so that we build both a knowledge database for what works, but also a skills database for the people who are skilled in putting in the equipment and interventions that matter.
So, there's absolutely no point in putting an air-source heat pump into a house that's got a rubbish roof and no insulation. It literally will have no effect whatsoever and will drive your electricity prices up. So, you'll need to understand how to insulate that house properly, what would work for that house, whether solar-panelled battery storage might be better than that—all sorts of things. So, there are all kinds of things.
We're bringing the learning across from our innovative housing programme as well. So, we've been running that for many years now and we know about those techs, whether they do what they said they would do, and we know what the houses look like, where they work the best. And that's going to be a real journey for us.
What we'll be doing as well is we'll be bringing the new Welsh housing quality standard to bear. So, once we know what works, we can start to roll that out with our social landlords. And again, as they did in the last one, they will over-skill the workforce and that workforce will become available in the private sector for people. Then, at that point, we will of course have to look at incentives—systems to assist homeowners to do that. It's an enormous amount of money across the piece.
Chris Jofeh's report made it very obvious that no Government alone could afford to do this. So, we'll be encouraging innovative solutions to that: things like—apologies, Chair, but to use my own constituency for a moment—Sero Homes in my own constituency, helping people to come together as a collective to put solar PV on roofs where they have the maximum coverage, putting battery storage into houses that have more space and then sharing out the electricity, both the purchasing of it at the cheapest possible rate and the storing of it and the distribution of it. So, there are many ways to crack this nut and we're looking at a whole range of them.