This article was generated with AI assistance from cited sources and has not been individually reviewed by an editor.
Most supplier scorecards fail because they weight everything equally, so a bidder can lose the points that matter and still pass on the points that do not. The scorecard below weights the eight questions by how hard each is to fix after signature. A 48-hour response promise you did not verify is impossible to retrofit; a missing spare-parts shelf can be built later. Weight the irreversible items first.
1. Response reality (weight 20). Do not accept “24/7 support” from a slide. Ask for the contractual response time, the measurement point, and the penalty for missing it. Then call the number on a Friday evening and time how long a human answers. A vendor with no European service desk will answer in a timezone you do not live in.
2. Local service bench (weight 20). How many certified technicians does the vendor employ in your country, and can you see them? A “partner” on another grid region is not a local bench. This is the single best predictor of whether year-two service exists at all.
3. Firmware support horizon (weight 10). Ask how long the vendor commits to security patches and feature updates, and what happens when the product line is discontinued. Storage firmware is software, and unpatched software on an internet-connected asset is a liability, not a feature.
4. Availability measurement basis (weight 15). How is “availability” defined in the guarantee — energy, power, or uptime percentage? Measured where, against what baseline, excluding what events? Two vendors can both promise “98%” and mean completely different things. This one is effectively non-negotiable after signature.
5. Augmentation price formula (weight 10). What is the per-kWh augmentation price, when does it trigger, and how is it indexed? A vendor that will not put the future price in writing is asking you to take a five-to-ten-year price risk on their terms.
6. Spare-parts and forward stock (weight 10). Where are the spares, who owns them, and what is the guaranteed lead time for a critical module? In Belgium, the Netherlands and Germany this is a question about days, not weeks.
7. Data ownership and export (weight 10). Who owns the operational data, can you export it on demand, and does it survive contract termination? The data layer is an asset (see our companion guide on monitoring and settlement), and losing it at end-of-term is a transfer of value you did not authorise.
8. Insolvency and exit terms (weight 5). What happens to the warranty and the O&M obligation if the vendor is acquired or fails? A warranty from a vendor that no longer exists is a warranty without teeth. Require an escrow or a nominated service successor.
Score each bidder 0–5 on each question, multiply by the weight, and rank. Then do the uncomfortable part: discard any bidder that scores zero on questions 1, 2 or 4, regardless of total. A zero on response reality, local bench, or availability definition is a structural defect no price can cure. Print this, send it to every bidder before tender, and compare the answers side by side. The vendor that answers precisely is the vendor that has thought about year ten; the vendor that dodges is the one you will be chasing in year two.
No manufacturer or EPC reviewed this guide before publication. Corrections are published, and flagged, within 48 hours of verification. Sources: corrective-maintenance response-time norms (4-hour critical, Dataintelo O&M market report 2025); Fluvius capacity-tariff structure (2026); TenneT/ACM Sequoia congestion contract (April 2026).
