What Buyers Need to Know When BESS Proposals Differ by Millions

When four battery energy storage proposals come back for the same project specification, you'd expect some variation. What you might not expect is a pricing spread that runs into the millions — with critical information missing from almost every one. This is what we found when a contractor shared four anonymised proposals with us. What started as a comparison exercise became something more useful: a framework for how buyers should be evaluating any energy storage proposal, at any price point.