What does a costed Net Zero roadmap actually require?

A costed Net Zero roadmap requires three things a commitment alone doesn’t have: a phased delivery plan with a funding structure attached to each phase, a baseline to measure progress against, and single accountability for how the plan actually gets delivered over its lifetime — not just who signed it off.

Why a commitment isn’t a roadmap

A Net Zero commitment is a target and a date. It answers “where are we going” without necessarily answering “how do we get there, in what order, and who’s responsible for each step.” That gap is usually what a board or an auditor asks about first — not whether the ambition is genuine, but whether there’s a credible, sequenced plan behind it.

What phasing actually solves

A single large infrastructure project, delivered all at once, requires the whole budget approved up front and the whole plan finished before anything shows progress. Phasing — generation first, storage and additional capacity added as budget and grid headroom allow — lets a roadmap show delivered progress against the target incrementally, funded in stages rather than as one large capital ask. Each phase needs its own funding structure decided (CapEx, asset finance, or Energy-as-a-Service), not one blanket assumption applied to the whole plan.

Why a baseline matters as much as the target

A target without a baseline is unmeasurable. Knowing what a system was expected to generate, and having recorded data on what it actually generated, is what lets a roadmap show real progress rather than a plan that stayed a plan. That data needs to exist from commissioning, not be reconstructed later when someone asks for it.

Why accountability has to span the whole roadmap, not just delivery

A roadmap delivered by different suppliers at each phase, with no one accountable across all of them, tends to drift — assumptions made in phase one don’t necessarily hold by phase three, and no single party is positioned to notice. One accountable partner across the whole roadmap is what keeps phase three consistent with the assumptions phase one was built on.

What this means before the next board update

If your Net Zero commitment doesn’t yet have a phased, funded, accountable plan behind it, that’s the gap worth closing before the next reporting cycle asks the question directly.