Is solar always the best first energy investment for a commercial site?

Not always. Solar is usually the most visible energy project — the one a board has already heard of — but it isn’t automatically the one with the fastest payback or the largest available saving. On some sites, measures like power factor correction, HVAC controls, or heat pump replacement return more for less capital, and get overlooked precisely because they’re less visible than a roof full of panels.

Why is solar usually proposed first, even when it isn’t the best first move?

Solar has a clear physical footprint, a straightforward story, and an obvious before-and-after. That makes it easy to propose and easy to approve — but ease of approval isn’t the same as return on capital. A site’s actual highest-return opportunity depends on its own consumption pattern, plant age, and tariff structure, not on which measure is easiest to explain in a boardroom.

What tends to get left out of the conversation?

Power factor correction and voltage optimisation typically require no roof space and carry some of the shortest payback periods available — but they don’t photograph well and rarely get proposed on their own. Heat pump and HVAC replacement often carries a stronger return than adding more generation capacity, particularly on sites where heating or cooling load, not electricity import, is the largest cost. None of this makes solar the wrong choice — it makes it one option among several that should be compared, not assumed.

Why does sequencing the investment matter for forecastability?

A cost base built around whichever measure was proposed first, rather than the one with the strongest return, is harder to defend to a board and harder to forecast against. Comparing measures on the same basis — capital required, payback period, and what happens to the numbers if energy prices move — is what turns an energy investment decision into something a CFO can actually stand behind.

What does this mean before you commit capital to a solar proposal?

If solar is the only measure that’s been costed so far, that’s worth checking against the rest of the site’s opportunity before capital gets committed. A whole-site assessment starts from the same half-hourly consumption data a solar proposal would use — it just compares that data against a wider set of measures.