- By default, unit prices, monthly and annual invoices are displayed in the portal including value added tax.
- Offers are ranked by default in each group from the cheapest monthly invoice to the most expensive. The monthly invoice takes into consideration all package components for one month (unit price, monthly fee, cost of sending the invoice, etc.).
- When calculating prices and invoices, the most up to date actual readings from your measuring points for the last 12 months are used, obtained from the Elering AS data warehouse (http://andmeladu.elering.ee/consumer/home). This means that the unit prices, monthly and annual invoices in the portal are calculated based on your actual rate of consumption.
- As of 1 January 2013, consumption data for all consumption locations is presented in the data warehouse on an hourly basis. If the measuring point is not equipped with a remote-read meter capable of measuring electricity consumption by the hour, the hourly data is obtained based on the network operator’s typical work load schedule.
- Depending on the type of meter, the consumption data for 2012 contained in the data warehouse is in the form of hourly data (remote-read meters), time rate, or base rate data (1 and 2 rate meters).
- The unit price is the weighted average price based on the actual consumption at the measuring point, regardless of the package. The monthly invoice is equal to the cost of the annual invoice divided by twelve, i.e. the average invoice amount for each month including all additional costs.
- In the case of a remote-read meter, a side-by-side comparison is drawn of the quantity of electricity consumed each hour with the cost of electricity for that hour, whether it is the exchange price + margin, fixed price, or combined price. This ensures a result that is as precise as possible.
- If the portal does not receive hourly data (there is no remote-read meter, the data in the data warehouse was not submitted in hourly form until 31.12.2012) from the data warehouse, the following logic shall be used in calculating costs:
- night and day consumption shall be divided percentage-wise as 55% day and 45% night consumption;
- in the case of the exchange price, the month’s average arithmetic price for the Nord Pool Spot Estonia region is used, which is determined as: the quantity x (the arithmetic average market price each month + the margin) consumed each month.

- in the case of a remote-read meter, the portal divides the hourly quantities consumed between periods of validity for night and day rates, and places them side-by-side with the corresponding price, based on which it finds the corresponding unit price and monthly and annual invoice cost.
- If a remote-read meter was not previously installed at the measuring point, the portal calculates the quantity consumed for the month, and then takes from there the share of 55% quantity consumed x day rate + 45% of the quantity consumed x night rate.

**Exchange price:**A side-by-side comparison is drawn from the quantity consumed each hour with the hourly price of Nord Pool Spot Estonia for that hour, to which the seller’s margin is added and on the basis of which the average weighted price, i.e. unit price, monthly and annual cost is calculated. Other components of the package are added to the monthly and annual cost. Each hour, the portal also calculates whether the rate in question is a night rate or day rate and uses the corresponding margin, if there is a difference and if the package permits. If a remote-read meter was not previously installed at the measuring point, then the logic of 55/45, the arithmetic average exchange price for the month, and the quantity consumed during the month, shall be used.

**Combined price:**The same formulas and logic used to calculate the fixed price and exchange price shall be used. The combined cost shall be calculated based on the share of the exchange price and the fixed price designated in the package or the entered share. For example, in the case of 30% exchange price and 70% fixed price, the annual invoice is determined as follows: 30% x exchange price annual invoice cost + 70% x fixed annual invoice cost.