I think there are three things. I'll try to go through them as briefly as possible.
One, there is still some scope for procurement. Saying very clearly what you want produces a market response. Investors and entrepreneurs want to know a market space they can pitch into, particularly if it's a highly regulated sector where the incumbents are very strong. You can do it a dozen different ways. You can do it with feed-in tariffs, you can do it with renewable energy targets, you can do it with energy storage requirements, but being clear about what you want really helps as a market signal.
Please bear in mind, and this is true across the world, that when businesses say they want certainty, they don't really mean it. What they really want is to win competitively. When they say they want a stable regime, that's true, they do, but they want it in order to be successful as individuals.
Regulation can be extremely creative. Investors and entrepreneurs can respond very clearly around being told what to do, but it's not enough, so you have to have a market response. Use taxes. Use a reward for delivering an outcome against an unpopular tax. It could be a property tax, it could be a capital gains tax. Take that away in return for a reward. Have a price signal that's measurable against performance from a tax. Have a market mechanism that allows entrepreneurs to work around--like a price for carbon--in a trading system. It doesn't have to be the same one as the Europeans have tried and experimented with, although we've learned a lot from that, but have some kind of market mechanism for carbon. That itself is not enough for innovation. You need some other strategies to build capacity, including supply chain capacity, to sell into markets. Carbon pricing will help, but it won't do it on its own.
The final point has to do with information itself. Have a strategy on information. Make information as available as possible, as open-source as possible, through open government but also through our amazing ability to communicate now on networks.