What is the Spot Price Surcharge Analysis and how does it work?

The Spot Price Surcharge Analysis is a calculation tool available to users with the Analytics add-on activated. It estimates the margin your electricity supplier charges above the raw hourly wholesale spot price, based on your uploaded invoices.

How it works

1. Your invoices contain a unit rate (price per kWh)
2. Inbilit fetches hourly spot prices for your market from public data sources (ENTSO-E for Europe, EIA for the United States)
3. The tool matches invoice billing periods to the corresponding spot price data
4. It calculates the difference: Invoice unit rate − Spot price = Estimated supplier margin

What you see

• Estimated surcharge per kWh in your currency (e.g. 0.02 EUR/kWh)
• Annualised cost estimate based on your consumption
• Data coverage indicator showing what percentage of hours were successfully matched

Important limitations

• The calculation covers only the commodity unit rate — it does not separate out grid tariffs, network charges, standing charges, taxes, VAT, or government levies, which may be legitimately included in your rate
• In markets like the UK, Germany, and the United States, many regulated charges are embedded in the unit rate and cannot be separated from the supplier margin using this method
• The result is an estimate, not a certified or audited figure
• This tool is available only to users with the Analytics add-on activated
• A minimum of one matched invoice and spot price period is required to produce a result; more data improves reliability