ENTSOG BAL NC Monitoring Report 2016

Table 5.3: Default rule applicable in case a marginal sell price and/or a marginal buy price

is not available

DEFAULT RULE APPLICABLE IN CASE A MARGINAL SELL PRICE AND/OR A MARGINAL BUY PRICE IS NOT AVAILABLE

BE/LU

It will always be possible to calculate the marginal price as there is always at least a weighted average price.

If for whatever reason no weighted average price is available, the previous available weighted average price will be taken into account.

Daily Reference Price of NCG is applied

If it is not possible to determine the imbalance prices on the basis of the principles described, the respective imbalance price of the

previous day shall be used.

Always available.

In case the prices are not available, last calculated marginal sell/buy prices apply.

Use of back-up price provided by PEGAS platform

7.2 chapter of the Trading platform operational rules

Pursuant to the TIB (Attachment to NRA Resolution 312/2016/R/gas), article 5, if, on a Gas day G, the GME communicates to SNAM

Rete Gas that the offers accepted for STSP title products at the MGAS Platform with delivery on the same Gas day G are lower than

2,000MWh overall, the weighted average price, for determining the Purchase/Sale Imbalance Prices is equivalent to the weighted

average price of the previous thirty days.

In case the weighted average price (the weighted average price from transactions of Intra-day Market at TGE – index TGEgasID) is not

available, the last published TGEgasID index will be applied.

As a default rule, daily weighted average prices at the PVB (Spanish Virtual Trading Point) are considered

(cross-border tariffs are added/discounted to the before mentioned prices).

National NC: avg of the last 5 weighted avg prices from the trading platform

UK-GB

The Default Adjustment

A ‘default’ adjustment (the ‘Default System Marginal Price’) is required when the GB TSO does not undertake any Market Balancing

Actions within a day and accordingly a default marginal price is applied. The GB TSO publishes a default system marginal price by no

later than August each year which is applicable for the forthcoming gas year (October to September).

The default adjustment for GB currently outturns at between 1–2% of the System Average Price (£1.11) and is calculated as follows:

Default System Marginal Price Calculation = {Annual Compressor Fuel Cost (£) x 100} + Average Forecast NTS

Total System Demand (TWh) x 10 Capacity Charges (pence/kWh).

UK-NI

“Daily Gas Price” shall: (i) firstly, be equal to the System Average Price (as defined in the GB Uniform Network Code) on the relevant Day;

(ii) secondly, where for any Day the System Average Price is not available the Daily Gas Price for that Day shall be equal to the arithmetic

mean of the System Average Price for each of the 7 preceding Days; and (iii) lastly, where for any Day for any reason the System Average

Price is not available under section 4.1.1(a)(i) or calculated under section 4.1.1(a)(ii), or if it is disputed, be such alternative price as

Premier Transmission may reasonably determine.

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ENTSOG BAL NC Monitoring Report 2016