For B2B energy retailers, product innovation is more important than ever - but it only works when margin can be designed and defended through to billing. Even after adopting state-of-the-art pricing, teams can still be constrained by their billing setup, limiting the products they can bring to market and creating avoidable margin leakage when complex contract logic is rebuilt outside the system of record.

"In complex C&I portfolios, small errors - a pass‑through applied inconsistently, a wrong meter attribute - can turn contracts loss-making. Gorilla’s pre‑billing calculation layer systemises the logic behind the invoice, so outputs are consistent, traceable, and aligned to contracted intent. Ultimately, reducing margin leakage."
Ruben Van den Bossche, CEO, Gorilla 

Most billing engines handle straightforward rate × volume, but not the contract logic behind blended rates, mid‑contract regulatory updates, or volume commitments. For retailers with complex I&C contracts, that logic gets rebuilt outside the billing system - often in spreadsheets - customer by customer. Runs take days, don’t scale across markets, and are painful to investigate when invoices are challenged.

Gorilla automates pre‑billing calculations for blended rates, pass‑through adjustments, and Take‑or‑Pay. It sits upstream of the billing system, which still generates the invoice, and supports contract and product changes via configuration updates - as long as the downstream billing system can accept the resulting output.

1. Blended rates from trade data, residual volume handling, and fees - producing billable rates with traceable breakdowns
2. Regulatory or industry updates that calculate deltas vs published rates and update only the impacted cost components
3. Take or Pay that applies threshold logic and outputs penalty/reward amounts with an audit trail

"One customer was running the same calculations for four countries across separate spreadsheets and scripts. Each run took most of a day - and any error meant starting again. We systemised the process, and they now process 1,000 connections in under a minute."
Joris Van Genechten , VP Product & Engineering, Gorilla

Retailers can now expand into new markets and launch flexible I&C contract types without multiplying headcount or spreadsheet models, because complex “what should we bill?” logic is configured once and reused across customers and markets. Invoices come out right the first time more consistently - with fewer disputes - and when a customer challenges a bill, there exists a detailed breakdown. This helps to protect realised revenue, reducing margin leakage, safeguarding the customer relationship, and mitigating compliance risk.