# Article 15 — Calculation of reserve prices for non-yearly standard capacity products for firm capacity with seasonal factors

- Where seasonal factors are applied, the reserve prices for non-yearly standard capacity products for firm capacity shall be calculated in accordance with the relevant formulas set out in Article 14 which shall be then multiplied by the respective seasonal factor calculated as set out in paragraphs 2 to 6.
- The methodology set out in paragraph 3 shall be based on the forecasted flows, unless the quantity of the gas flow at least for one month is equal to 0. In such case, the methodology shall be based on the forecasted contracted capacity.
- For monthly standard capacity products for firm capacity, the seasonal factors shall be calculated in the following sequential steps:
- for each month within a given gas year the usage of the transmission system shall be calculated on the basis of forecasted flows or forecasted contracted capacity using:
- the data for the individual interconnection point, where the seasonal factors are calculated for each interconnection point;
- the average data on the forecasted flows or the forecasted contracted capacity, where the seasonal factors are calculated for some or all of the interconnection points.

- the resulting values referred to in point (a) shall be summed up;
- the usage rate shall be calculated by dividing each of the resulting values referred to in point (a) by the resulting value referred to in point (b);
- each of the resulting values referred to in point (c) shall be multiplied by 12. Where the resulting values are equal to 0, these values shall be adjusted to whichever of the following is the lower: 0,1 or the lowest of the resulting values other than 0;
- the initial level of the respective seasonal factors shall be calculated by raising each of the resulting values referred to in point (d) to the same power which is no less than 0 and no more than 2;
- the arithmetic mean of the products of the resulting values referred to in point (e) and the multiplier for monthly standard capacity products shall be calculated;
- the resulting value referred to in point (f) shall be compared with the range referred to in Article 13(1), as follows:
- if this value falls within this range then the level of seasonal factors shall be equal to with the respective resulting values referred to in point (e);
- if this value falls outside of this range then point (h) shall apply.

- the level of seasonal factors shall be calculated as the product of the respective resulting values referred to in point (e) and the correction factor calculated as follows:
- where the resulting value referred to in point (f) is more than 1,5, the correction factor shall be calculated as 1,5 divided by this value;
- where the resulting value referred to in point (f) is less than 1, the correction factor shall be calculated as 1 divided by this value.

- for each month within a given gas year the usage of the transmission system shall be calculated on the basis of forecasted flows or forecasted contracted capacity using:
- For daily standard capacity products for firm capacity and within-day standard capacity products for firm capacity, the seasonal factors shall be calculated by carrying out the steps set out in paragraph 3(f) to (h), mutatis mutandis.
- For quarterly standard capacity products for firm capacity, the seasonal factors shall be calculated in sequential steps as follows:
- the initial level of the respective seasonal factors shall be calculated as either of the following:
- equal to the arithmetic mean of the respective seasonal factors applicable for the three relevant months;
- no less than the lowest and no more than the highest level of the respective seasonal factors applicable for the three relevant months.

- the steps set out in paragraph 3(f) to (h) shall be carried out, using the resulting values referred to in point (a), mutatis mutandis.

- the initial level of the respective seasonal factors shall be calculated as either of the following:
- For all non-yearly standard capacity products for firm capacity, the values resulting from the calculation referred to in paragraphs 3 to 5 may be rounded up or down.

Content gratefully obtained from the © European Union. Brought to you by Lexparency.org.