In accordance with Article 2.10 of the Exchange Rules, BSP Energy Exchange (BSP SouthPool) publishes the SIPX market indices daily, as part of public notifications of market trends.

SIPXquarterly (i) is a 15-minute electricity index on the Slovenian power exchange, equal to the marginal price calculated in the day-ahead auction on the Slovenian power exchange.

The symbol i represents consecutive 15-minute intervals from 1 to 96, or as defined in section 2. Consequences of the clock shift (summer and winter time) on the calculation of SIPX indices.

If in interval i there is neither a buy nor a sell order, the SIPXquarterly value for that interval is taken from the corresponding previous market day (previous working day, non-working day, or public holiday).

SIPXhourly (j) is an electricity index in Slovenia, representing the average hourly price calculated on the basis of 15-minute trades concluded within the respective delivery hour on the Slovenian power exchange. It has values from 1 to 24, or as defined in section 2. Consequences of the clock shift (summer and winter time) on the calculation of SIPX indices.

The formula for calculating SIPXhourly (j), where j represents the delivery hour and k the consecutive 15-minute interval within hour j:

SIPXbase (d) is an electricity index in Slovenia, representing the average daily price calculated on the basis of all 15-minute trades concluded during the respective delivery day on the Slovenian power exchange.

The formula for calculating SIPXbase (d), where d represents the delivery day and i the consecutive 15-minute interval:

SIPXeuropeak (d) is an electricity index in Slovenia, representing the average electricity price in the so-called Euro-Peak period (08:00–20:00 CET), calculated on the basis of 15-minute trades concluded on the Slovenian power exchange.

The formula for calculating SIPXeuropeak (d), where d represents the delivery day and i the consecutive 15- minute interval:

On a regular day, the day consists of 96 consecutive 15-minute products (intervals), for which SIPXquarterly indices are calculated.

When shifting from winter to summer time, at 02:00 CET the clock moves directly to 03:00 CEST, so the day has 92 consecutive 15-minute products. In this case, SIPXquarterly indices are not defined for the missing intervals and are simply not calculated. Consequently, SIPXhourly, SIPXbase and SIPXeuropeak indices are also calculated on the basis of the existing intervals of the day (i.e. 92 instead of 96).

When shifting from summer to winter time, at 03:00 CEST the clock moves back to 02:00 CET, so the day has 100 consecutive 15-minute products. The duplicated intervals between 02:00 and 03:00 CET are separately labelled as 02a and 02b. SIPXquarterly and SIPXhourly indices are calculated for both intervals.