A certificate inventory is the collection of EACs a company currently holds across all its registry accounts. It reflects what certificates exist and where they are held, regardless of whether they have been committed to any obligation.
A certificate inventory lists each certificate (or batch of certificates) currently held by the company, along with the attributes that define it: certificate type, technology, country, vintage, generator, and registry account location. A typical large utility's inventory contains tens of thousands of certificates across multiple registries, each with their own access requirements.
Inventory is what you have, whereas your portfolio position is what you owe or are owed after netting your inventory against your contractual commitments. A company can have 100,000 GoOs in inventory but a short position if it has sold 110,000 GoOs forward and not yet sourced the difference.
Most utilities maintain their certificate inventory in spreadsheets, with updates triggered by trade confirmations, registry exports, and manual adjustments. The accuracy of the inventory depends on the frequency of reconciliation with the registries; the more time passes between updates, the more likely the internal inventory diverges from registry reality.
The two most common failures are stale data (the registry has moved on but the spreadsheet has not) and double-counting (the same certificate appears in multiple spreadsheets or is committed to multiple obligations). Both lead to operational errors: missed cancellations, double-selling, or stranded certificates approaching expiry.
Explore other terms like
Certificate inventory
