APPENDIX C Storage Operational Conditions

Transcription

1 Natural Gas Storage Contract APPENDIX C Storage Operational Conditions Version of 1 April 2017

2 CONTENTS ARTICLE 1. PURPOSE OF THE APPENDIX... 3 ARTICLE 2. EXCHANGES OF INFORMATION: TRANSPORT/STORAGE EQUIVALENCY... 3 ARTICLE 3. SIGNS, UNITS AND CALCULATION RULES... 3 ARTICLE 4. FORECASTS... 4 ARTICLE 5. SCHEDULING... 5 ARTICLE 6. DAILY ASSESSMENT ARTICLE 7. COORDINATION ARTICLE 8. DATA COMMUNICATION MEANS AND METHODS Natural Gas Storage Contract Appendix C: Storage Operational Conditions 2

3 ARTICLE 1. PURPOSE OF THE APPENDIX Appendix C specifies the elements stipulated in the General Terms and Conditions under the terms "Operational Procedures" and "Rules for Determining Quantities". ARTICLE 2. EXCHANGES OF INFORMATION: TRANSPORT/STORAGE EQUIVALENCY The Transport Network Manager and the Storage Facility Manager share the same information system, which enables signatories to the Contract not to duplicate information exchanges at the Transport/Storage Interface Point (PITS). Notifications and timetables are common to both operators. To prevent any potential confusions concerning vocabulary between the general terms and conditions of the transport contract and the general terms and conditions of this Storage Contract, the following terms should be seen as equivalent: Daily Injected Quantities (or Daily Quantities Injected) = Daily Quantities Allocated at the PITSL (QJA PITSL (D)) Daily Withdrawn Quantities (or Daily Quantities Withdrawn) = Daily Quantities Allocated at the PITSE (QJA PITSE (D)) PITS = Transport/Storage Interface Point o o PITSL = Delivery Transport/Storage Interface Point PITSE = Input Transport/Storage Interface Point ARTICLE 3. SIGNS, UNITS AND CALCULATION RULES The Storage Facility Manager and the Customer admit the following sign agreement for the preparation of the forecasts, notifications, revised notifications, Daily Programme and Daily Assessment: (i) The Daily Quantities Withdrawn have a positive sign, and correspond to an input into the Transport Network. (ii) The Daily Quantities Injected have a negative sign, and correspond to a delivery from the Transport Network. (iii) Total Operational Capacity Limits: if it is a withdrawal limit, whether minimum or maximum: this value is positive and corresponds to an input into the Transport network, if it is an injection limit, whether minimum or maximum: this value is negative and corresponds to a delivery from the Transport network. (iv) Final Stock: always positive or zero. Natural Gas Storage Contract Appendix C: Storage Operational Conditions 3

4 (v) The Daily Quantities Allocated for Storage Purchase/Sale (QJA AVS) relative to an overrun of stock limits have: a positive sign if the Storage Facility Manager is purchasing Gas from the Customer, a negative sign if the Storage Facility Manager is selling Gas to the Customer. (vi) The Quantities of Gas exchanged between Users of the Storage Facility (Q PEG-ATS) have: a positive sign for the Storage Facility User that is selling Gas, a negative sign for the Storage Facility User that is buying Gas. The Quantities of Gas are expressed in kwh at 25 C and the Capacities are expressed in kwh/d at 0 C. The applicable calculation and rounding off rules are as follows: (i) Stock Level: rounded to ten decimal places (which as a percentage gives a value with eight decimal places). (ii) Evolution Factor: the Evolution Factor values corresponding to the Stock Levels 100%, 0% and the inflection points of the Evolution Factor are given in Appendix B "Physical Features of the Storage Facility" of this contract. Between these Stock Level values, the Evolution Factors can be calculated by linear interpolation and rounded to ten decimal places. (iii) Total Operational Capacity Limits: rounded to the nearest whole kwh (for example: 0.5 kwh = 1 kwh, 0.49 kwh = 0 kwh). ARTICLE 4. FORECASTS 4.1 Seasonal forecast of Monthly Quantities of Gas As early as possible after the Contract comes into effect, then by 1 March of each year at the latest, the Customer provides the Storage Facility Manager with his best seasonal forecast for the monthly injection and withdrawal Quantities of Gas at the Transport/Storage Interface Point for the following Summer. As early as possible after the Contract comes into effect, then by 1 September of each year at the latest, the Customer provides the Storage Facility Manager with his best seasonal forecast for the monthly injection and withdrawal Quantities of Gas at the Transport/Storage Interface Point for the following Winter. The sole purpose of these forecasts is to enable the Storage Facility Manager to optimise the scheduling of Maintenance Operations. 4.2 Monthly forecast of Daily Quantities of Gas By the twenty-fifth (25 th ) of each Month at the latest, the Customer provides the Storage Facility Manager with his best monthly injection and withdrawal forecast for each Day of the following Month. Natural Gas Storage Contract Appendix C: Storage Operational Conditions 4

5 4.3 Weekly forecast of Daily Quantities of Gas Every Thursday by twelve o clock (12.00) at the latest, the Customer provides the Storage Facility Manager with his best weekly injection and withdrawal forecast at Transport/Storage Interface Point for each Day of the following Week. ARTICLE 5. SCHEDULING 5.1 Daily Notification Each Day, the Customer informs the Storage Facility Manager of the Quantities of Gas that he wishes to input ("Daily Quantities Requested for Withdrawal") or to deliver ("Daily Quantities Requested for Injection") on the following Day at the Transport/Storage Interface Point. This notification is termed "Daily Notification". On a given Day, the Customer cannot give notice of both a non-nil Quantity Requested for Injection and a nonnil Quantity Requested for Withdrawal. If the Customer attempts to do so, the Daily Notification will be rejected. The Daily Quantities Requested for a given Day are considered equal to the latest Daily Quantities Requested for Injection or Withdrawal provided by the Customer and received by the Storage Facility Manager for the Day in question, in the form of Daily Notifications, weekly forecasts, or monthly forecasts. Unless other Daily Quantities Requested for Injection or Withdrawal are provided by the Customer and received by the Storage Facility Manager by 2 p.m. (14.00) on the Day before for a given Day D, the Daily Quantities Requested for Day D are considered to be equal to the Daily Quantities Requested for Injection or Withdrawal for Day D-1. The Customer may ask for a Daily Quantity Requested for Injection or Withdrawal to be changed for a given Day subject to the conditions set out in article 5.4 below. 5.2 Notification Times For a given Day D, the Customer and the Storage Facility Manager undertake to agree the following notification times: (i) Time limit for Notifications by the Customer: 2 p.m. on Day D-1. Any notification reaching the Storage Facility Manager after 2 p.m. (14.00) will be considered as a revised notification. (ii) Time limit for sending the Daily Schedule by the Storage Facility Manager: 4 p.m. (16.00) on Day D-1. The times stated refer to French time. 5.3 Preparation of the Daily Schedule for Day D On the basis of the Daily Quantities Requested for Injection or Withdrawal, as specified in article 5.1 above, the Storage Facility Manager prepares the Daily Schedule for Day D by carrying out all of the tests described in this article. Natural Gas Storage Contract Appendix C: Storage Operational Conditions 5

6 The Daily Quantities Scheduled for Injection or Withdrawal at the Transport/Storage Interface Point on a given Day may not differ from the Daily Quantities Requested for Injection or Withdrawal at the same Point except in the following cases: the Daily Quantities Requested for Injection or Withdrawal exceed the limits of the obligations of the Storage Facility Manager resulting from articles 5.1.1, and of the General Terms and Conditions, the Daily Quantities Requested for Injection or Withdrawal are not compatible with the daily quantities that the Customer asks the Transport Network Manager to deliver from or input to the Transport/Storage Interface Point, or scheduled for delivery from or for input to that same point by the Transport Network Manager for the Customer, which requires the application of the rules to ensure consistency with the Transport Network Manager, as specified in the Operational Procedures, in application of article of the General Terms and Conditions. Test of Total Operational Capacity Limits The Daily Quantities Requested for Injection or Withdrawal by the Customer for Day D may be approved unconditionally by the Storage Facility Manager if these Quantities are between the minimum and maximum Total Operational Capacity Limits (CTL) for Injection or Withdrawal, in accordance with the Physical Features of the Storage Facility set out in Appendix B of the Contract and applied to the Storage Capacities subscribed by the Customer under a Standard Offer. The method for calculating the CTL is given in article below. The CTL applicable on Day D are provided for the first time on D-1, before 2 p.m. (14.00) by the Storage Facility Manager. The CTL applicable on Day D are then recalculated by the Storage Facility Manager and provided to the Customer within the Limits after each Daily Notification revision for Day D-1 modifying the Stock of Day D-1. The definitive CTL applicable on Day D are provided to the Customer within the Limits on Day D before 2 p.m. (14.00). The Daily Notification may be approved unconditionally by the Storage Facility Manager if it meets the following conditions: (i) If the Customer has the possibility of injecting or withdrawing (i.e. the Minimum CTL for Injection and Withdrawal are equal to zero): Withdrawal test: The Daily Quantity Requested for Withdrawal for Day D must be lower than or equal to the Max CTL value for Withdrawal (D) provided within the Limits. Otherwise, the Daily Quantity Scheduled for Withdrawal by the Storage Facility Manager is capped at this limit. Injection test: The absolute value of the Daily Quantity Requested for Injection for Day D must be lower than or equal to the absolute value of the Max CTL value for Injection (D) provided within the Limits. Otherwise, the Daily Quantity Scheduled for Injection by the Storage Facility Manager is capped at this limit. (ii) If the Customer only has the possibility of withdrawing: Injection test: The max CTL for Injection (D) provided within the Limits is therefore equal to zero (0). The Storage Facility Manager will not accept any notifications at the PITSL for Day D. The value at the PITSL is equal to zero. Withdrawal test: The Daily Quantity Requested for Withdrawal for Day D must be lower than or equal to the Max CTL value for Withdrawal (D) provided within the Limits. Otherwise, the Daily Quantity Scheduled for Withdrawal by the Storage Facility Manager is capped at this limit. If the Customer s notification at the PITSE for Day D is lower than the Min CTL value for Withdrawal (D), the Daily Notification will be accepted but the Customer assumes the risk of a Maximum Stock Overrun. Natural Gas Storage Contract Appendix C: Storage Operational Conditions 6

7 (iii) If the Customer only has the possibility of injecting: Withdrawal test: The max CTL for Withdrawal (D) provided within the Limits is therefore equal to zero (0). The Storage Facility Manager will not accept any notifications at the PITSE for Day D. The value at the PITSE is equal to zero. Injection test: The absolute value of the Daily Quantity Requested for Injection for Day D must be lower than or equal to the absolute value of the Max CTL value for Injection (D) provided within the Limits. Otherwise, the Daily Quantity Scheduled for Injection by the Storage Facility Manager is capped at this limit. If the Customer s notification at the PITSL for Day D is lower, in absolute value, than the absolute value of the Min CTL value for Injection (D), the Daily Notification will be accepted but the Customer assumes the risk of a Minimum Stock Overrun. For Day D, the Customer has the possibility of giving notification for Daily Quantities Requested for Injection or Withdrawal whose absolute value is greater than the Max CTL for Injection (D) or Withdrawal (D), under the conditions specified in article below. Storage Optimisation The principle of Storage Optimisation is to provide interested Storage Facility Users with unused Daily Injection and Withdrawal Capacities. If the sum of the Daily Quantities Requested for Injection beyond the Max CTL for Injection (D) or the sum of the Daily Quantities Requested for Withdrawal beyond the Max. CTL for Withdrawal (D) is greater than, respectively, the unused Daily Injection Capacity or the unused Daily Withdrawal Capacity, then for each Storage Facility User in question, the Daily Quantity Scheduled for Injection or Withdrawal, as appropriate, is decreased in proportion to the Daily Quantities Requested beyond the Max CTL. For Day D, any Storage Facility User has the possibility of giving notification for Daily Quantities Requested for Injection or Daily Quantities Requested for Withdrawal whose absolute value is greater than, respectively, the Max CTL for Injection (D) or the Max CTL for Withdrawal (D), provided that: (i) These Daily Quantities Requested for Injection or these Daily Quantities Requested for Withdrawal are not greater than, respectively, the Nominal Daily Injection Capacity or the Nominal Daily Withdrawal Capacity; (ii) This notification does not lead to a Maximum Stock Overrun or a Minimum Stock Overrun, as the case may be. Scheduling of Quantities at the PITS Once the tests described in articles and have been approved and once the confirmation test in article of Appendix H.3.2 of the natural gas transport contract, signed between the Customer and the Transport Network Manager, has been applied, the Daily Quantities Requested for Injection or Withdrawal are deemed to become Daily Quantities Scheduled for Injection or Withdrawal. The Daily Scheduled Quantities beyond the Max CTL are interruptible, meaning that they may be capped if unused Daily Capacities fall below the sum of the Daily Quantities Requested by the Storage Facility Users beyond their max CTL. This capping arrangement complies with the hourly capacity constraint: each hour of Day D, the interruptible part of the Daily Scheduled Quantity above Max CTL decreases by one twenty-fourth (1/24 th ). Natural Gas Storage Contract Appendix C: Storage Operational Conditions 7

8 Sending the Daily Schedule The Storage Facility Manager sends the Daily Schedule to the Customer. This Schedule includes the Daily Quantities Scheduled for Withdrawal "QJP PITSE (D)" and the Daily Quantities Scheduled for Injection "QJP PITSL (D)". If the Storage Facility Manager fails to give notification for Daily Quantities Scheduled for Injection or Withdrawal for Day D, the Daily Quantities Scheduled for Injection or Withdrawal for that Day D are considered to be equal to the Daily Quantities Requested for Injection or Withdrawal and are taken into account by the Storage Facility Manager. 5.4 Revised Daily Notification process Subject to the observance of the other stipulations in the Contract, the Storage Facility Manager undertakes to make all reasonable efforts to accept the revised Daily Notification. Content of revised notifications A revised Daily Notification supersedes the previous Daily Notification and revised Daily Notifications. A revised Daily Notification must include all of the Quantities of Gas described in article 5.1. In particular, in the event of a change in direction (going from injection to withdrawal or vice versa), in his revised Daily Notification, the Customer must zero the Daily Quantity that he wants to cancel at the Transport/Storage Interface Point. Revised Daily Notification for Day D received before 4 a.m. on Day D-1 From 4 p.m. (16.00) on Day D-1 until 4 a.m. (04.00) on Day D-1, the Customer can continuously revise his Daily Notifications for Day D. At each exact hour, the Storage Facility Manager processes the last submitted revised Daily Notification and within two hours sends: The new Daily Schedule, if the revised Daily Notification is accepted, The applicable Daily Schedule and a comment specifying the reason why the revised Daily Notification was refused, if indeed that is the case. Revised Notification received for intra-day application for Day D From 5 a.m. (05.00) on Day D-1 until 3 a.m. (03.00) on Day D, the Customer can continuously revise his Daily Notifications for Day D. Natural Gas Storage Contract Appendix C: Storage Operational Conditions 8

9 At each exact hour, the Storage Facility Manager processes the last submitted revised Daily Notification and within two hours sends: The new Daily Schedule, if the revised Daily Notification is accepted, The applicable Daily Schedule and a comment specifying the reason why the revised Daily Notification was refused, if indeed that is the case. The Storage Facility Manager s information system records no revised Daily Notifications for Day D after 3 a.m. (03.00) on Day D. Preparation of the new Daily Schedule within the framework of a revised Daily Notification from the Customer (i) Revision received before 4 a.m. (04.00) on Day D-1 (article 5.4.2) On the basis of the revised Daily Notification, the Storage Facility Manager prepares the new Daily Schedule according to the Daily Schedule preparation process described in article 5.3. (ii) Revision received after 4 a.m. (04.00) on Day D-1 for intra-day application for Day D (article 5.4.3) On the basis of the revised Daily Notification, the Storage Facility Manager prepares the new Daily Schedule according to the Daily Schedule preparation process described in article 5.3, making sure that the following hourly capacity constraint is complied with: The lower limit of the revised Daily Notification is equal to the product of the Daily Quantity Scheduled for Injection or Withdrawal divided by twenty-four (24), multiplied by the number of hours between the start of Day D and the first active hour of the new Daily Schedule (i.e. Notification revision time + two hours), The upper limit of the revised Daily Notification is equal to the sum of the lower limit of the revised Daily Notification and the product of the Max CTL for Injection or Max CTL for Withdrawal (depending on situations discussed on article 5.3) divided by twenty-four (24) multiplied by the number of hours between the first active hour of the new Daily Schedule and the end of the Day in question. If the Daily Notified Quantities are greater than the upper limit of the revised Daily Notification or lower than the lower limit of the revised Daily Notification, the Storage Facility Manager reserves the right to refuse the Daily Notification in question. The principle of Storage Optimisation mentioned in article remains applicable to Daily Notification revisions. Preparation of the new Daily Schedule at the Storage Facility Manager s initiative and in the absence of a revised Daily Notification from the Customer In the event of a Special Situation, the Daily Quantities Scheduled for Injection or Withdrawal for a given Day D may be modified by the Storage Facility Manager at his own initiative. If this happens, the Storage Facility Manager prepares a new Daily Schedule, depending on the last Daily Notification or revised Daily Notification received from the Customer. Natural Gas Storage Contract Appendix C: Storage Operational Conditions 9

10 5.5 Reduction in Capacities Subscribed Capacity reduction notice (i) Notice of Scheduled Maintenance and Rate of Service The Storage Facility Manager may be required to reduce the value of a Daily Injection or Withdrawal Capacity in order to carry out Maintenance Operations on the Storage Facilities. The Storage Facility Manager informs the Customer of this within the timeframes and in accordance with the provisions set out in article 9 of the General Terms and Conditions. The subsequent Daily Schedule is drawn up in accordance with the provisions of article (ii) Capacity reductions known on Day D or D-1 for Day D When the Storage Facility Manager is required to reduce the value of a Daily Injection or Withdrawal Capacity or an Hourly Injection or Withdrawal Capacity on Day D or D-1 for Day D, the Storage Facility Manager informs the Customer of this as soon as possible, and provides the Customer with the new Daily Schedule. Preparation of the new Daily Schedule The Storage Facility Manager uses the Total Operational Capacity Limits. The product of the Rate of Service and these Total Operational Capacity Limits gives the provisional capacity limits known as Reduced Total Operational Capacity Limits (Reduced Max CTL), which will be used as a basis to prepare the Daily Schedule in accordance with the process described in article 5.3, modified through the application of the principle, described above, to optimise available Daily Injection or Withdrawal Capacities. This principle consists in providing interested Storage Facility Users with unused Daily Injection or Withdrawal Capacities, in proportion to the Daily Quantities Requested by the Storage Facility Users beyond their Reduced Max CTL. The Daily Scheduled Quantities greater than the Reduced Max CTL are interruptible, in that they may be capped if unused Daily Capacities fall below the sum of the Daily Quantities Requested by Storage Facility Users beyond their max CTL. Storage Facility Users that have given notification for Daily Quantities below the Reduced Max CTL may raise these Daily Notifications. ARTICLE 6. DAILY ASSESSMENT Each Day, the Storage Facility Manager informs the Customer of the Daily Quantities Injected, Withdrawn, Purchased and/or Sold over the previous Day and the Stock valid at the start of the Day. 6.1 General Determining the Daily Quantities Injected Unless otherwise stated in the Rules for Determining Quantities, the Daily Quantity Injected on Day D at the Transport/Storage Interface Point is equal to the Daily Quantity Scheduled for Injection by the Storage Facility Manager for the Day in question and allocated at the Transport/Storage Interface Point. Natural Gas Storage Contract Appendix C: Storage Operational Conditions 10

11 Determining the Daily Quantities Withdrawn Unless otherwise stated in the Rules for Determining Quantities, the Daily Quantity Withdrawn on Day D at the Transport/Storage Interface Point is equal to the Daily Quantity Scheduled for Withdrawal by the Storage Facility Manager for the Day in question and allocated at the Transport/Storage Interface Point. Determining the Stock Each Day other than the effective start date of the Contract, the Stock of the Day is equal to the Stock of the previous Day plus the Quantity of Gas received via a transfer of Gas in Stock, plus the Daily Quantity Injected on the Day in question at the Transport/Storage Interface Point, plus the Daily Quantity Sold by the Storage Facility Manager to cover a Minimum Stock Overrun on the Day in question, minus the Quantity of Gas transferred via a transfer of Gas in Stock, minus the Daily Quantity Withdrawn on the Day in question at the Transport/Storage Interface Point, and minus the Daily Quantity Purchased by the Storage Facility Manager to cover a Maximum Stock Overrun on the Day in question. Determining the Initial Stock The Initial Stock is equal to zero (0), possibly with the addition of the previous Day's Stock under a Natural Gas Storage Contract held by the Customer that expires on that date, and/or under a transfer (merger). 6.2 Content of the Daily Assessment Each Day D+1 before 2 p.m. (14.00), the Storage Facility Manager sends each Storage Facility User a Provisional Daily Assessment for Day D. The Daily Assessment summarises: a) The Daily Quantity Allocated at the PITSE or the PITSL (QJA PITSE (D) or QJA PITSL (D) term) b) The Daily Quantity Allocated for Storage Purchase/Sale (QJA AVS (D) term) c) The Final Stock for Day D (QJA SF (D) term) d) The Quantity Exchanged in the Storage Facility (Q PEG-ATS term) 6.3 Limits content Each Day D+1 before 2 p.m. (14.00), the Storage Facility Manager sends each Storage Facility User his Provisional Limits applicable on Day D+2. The Limits summarise: a) The D+1 Reference Stock to be used as a basis for calculating the CTL (SR (D+1) term), b) The Max CTL for Withdrawal applicable for the Daily Schedule on Day D+2 (Max CTL for Withdrawal (D+2) term), c) The Max CTL for Injection applicable for the Daily Schedule on Day D+2 (Max CTL for Injection (D+2) term), Natural Gas Storage Contract Appendix C: Storage Operational Conditions 11

12 d) The Min CTL for Withdrawal applicable for the Daily Schedule on Day D+2 (Min CTL for Withdrawal (D+2) term), e) The Min CTL for Injection applicable for the Daily Schedule on Day D+2 (Min CTL for Injection (D+2) term), f) The Minimum Stock (D+2) applicable for the Daily Schedule of Day D+2, g) The Maximum Stock (D+2) applicable for the Daily Schedule of Day D+2. In the event of a capacity reduction: h) The Reduced Max CTL for Withdrawal applicable for the Daily Schedule on Day D+2 (Reduced Max CTL for Withdrawal (D+2) term), i) The Reduced Max CTL for injection applicable for the Daily Schedule on Day D+2 (Reduced Max CTL for Injection (D+2) term). Between 2 p.m. (14.00) on Day D+1 and 4 a.m. (04.00) on Day D+1, the provisional limits applicable on Day D+2 are recalculated by the Storage Facility Manager and provided to the Customer after each Daily Notification revision for Day D+1 modifying the Stock of Day D+1. The definitive limits applicable on Day D+2 are provided to the Customer by 2 p.m. (14.00) on Day D Preparation of Daily Allocated Quantities Determining the Initial Daily Quantity Allocated at the PITS The Daily Quantity Allocated at the PITS is equal to the Daily Quantity Scheduled at the PITS: QJA PITS (D) = QJP PITS (D) The Storage Facility Manager provides the Transport Network Manager with the values of the term QJA PITS (D) which will be used by the Transport Network Manager to calculate the final daily discrepancies as stipulated in Appendix H.3.2 of the natural gas transport contract. Determining the Daily Quantity Allocated for Storage Purchase/Sale in the event of a Maximum or Minimum Stock Overrun The provisional Final Stock (SFp) on Day D is equal to the difference between the Final Stock on Day D-1 (or the Initial Stock if Day D-1 is the date when the Contract takes effect) and the Daily Quantity Allocated at the PITS, plus where applicable the Quantities of Gas exchanged as part of a transfer of Gas in Stock: QJA SFp (D) = QJA SF (D-1) - QJA PITS (D) Q PEG-ATS (D) If QJA SFp (D) >Maximum Stock, then there is a Maximum Stock Overrun QJA AVS (D) = QJA SFp (D) - Maximum Stock If QJA SFp (D) < Minimum Stock, then there is a Minimum Stock Overrun QJA AVS (D) = QJA SFp (D) - Minimum Stock Natural Gas Storage Contract Appendix C: Storage Operational Conditions 12

13 When calculating the Daily Assessment, Storage Purchases/Sales correspond to the following situations: If the Customer is required to withdraw and if the absolute value of the Daily Quantity Allocated at the PITSE is lower than the Min CTL for Withdrawal (D), the Customer is in a position where he withdraws a quantity less than that which was specified for him to meet his Maximum Stock. Thus, the absolute value of QJA AVS (D) is equal to the difference, in absolute value, between the provisional Final Stock and the Maximum Stock limit. The sign of QJA AVS (D) is positive (which is equivalent to a withdrawal made by the Storage Facility Manager on the Customer s behalf). If the Customer is required to inject and if the absolute value of the Daily Quantity Allocated at the PITSL is lower than the Min CTL for Injection (D), the Customer is in a position where he injects a quantity less than that which was specified for him to meet his Minimum Stock. Thus, the absolute value of QJA AVS (D) is equal to the difference, in absolute value, between the provisional Final Stock and the Minimum Stock limit. The sign of QJA AVS (D) is negative (which is equivalent to an injection made by the Storage Facility Manager on the Customer s behalf). In all other cases, QJA AVS (D) is equal to zero (0). Determining the Final Stock after Storage Purchase/Sale The Final Stock on Day D is equal to the difference between the provisional Final Stock on Day D-1 and the Daily Quantity Allocated at the PITS, plus where applicable the allocated quantities exchanged as part of a transfer of Gas in Stock or a Storage Purchase/Sale: QJA SF (D) = QJA SF (D-1) - QJA PITS (D) - Q PEG-ATS (D) - QAVS (D) Total Operational Capacity Limits on D+2 and Reference Stock on D+1 The Reference Stock on D+1 (SR (D+1)) is calculated as the difference between the Provisional Final Stock on Day D and the QJP PITS (D+1), plus the Quantities Exchanged between Storage Facility Users. SR (D+1) = QJA SF (D) - QJP PITS (D+1) - Q PEG-ATS (D+1) If SR (D+1) > Maximum Stock, then there is a Maximum Stock Overrun SR (D+1) = Maximum Stock If SR (D+1) < Minimum Stock, then there is a Minimum Stock Overrun SR (D+1) = Minimum Stock The Storage Facility Manager calculates the CTL terms (D+2) applicable on D+2, on the basis of Reference Stock on D+1, as explained below. Calculation of the Total Operational Capacity Limits (CTL): The time constraints (Minimum and Maximum Stock) and space constraints (Evolution Factors) applicable to the Daily Nominal Injection and Withdrawal Capacities can be used to calculate the Total Operational Capacity Limits (CTL) applicable for a given Day depending on the Stock Level in question. The CTL calculation may therefore lead to a reduction in the Daily Nominal Injection or Withdrawal Capacities. The CTL applicable on Day D+2 are derived from the calculations described below. Natural Gas Storage Contract Appendix C: Storage Operational Conditions 13

14 Considering the quantities as absolute values: If SR (D+1) >= Min Stock (D+1) (the forecast stock level is greater than the minimum stock level for the following Day): Max CTL for Withdrawal (D+2) = Min [SR (D+1) - Min Stock (D+2); Daily Withdrawal Capacity (D+2)] Otherwise: Max CTL for Withdrawal (D+2) = 0 (the Customer cannot withdraw and must inject) Min CTL for Injection (D+2) = Min [SR (D+1) - Min Stock (D+2); Daily Injection Capacity (D+2)] If SR (D+1) <= Max Stock (D+2) (the forecast stock level is lower than the maximum stock level for the following Day) Max CTL for Injection (D+2) = Min [SR (D+1) - Max Stock (D+2) ; Daily Injection Capacity (D+2)] Otherwise: Max CTL for Injection (D+2) = 0 (the Customer cannot inject and must withdraw) Min CTL for Withdrawal (D+2) = Min [SR (D+1) - Max Stock (D+2); Daily Withdrawal Capacity (D+2)] 6.5 Exchanges of Quantities of Gas between Storage Facility Users Under article 7 of the General Terms and Conditions, Storage Facility Users may exchange Quantities of Gas in Stock at the beginning of each Month, with ten days notice. Each User must send the information relating to this exchange to the Storage Facility Manager by separate (and not in the Daily Notification). Subject to the Storage Facility Manager s agreement, the exchange of Quantities of Gas is made directly by the Storage Facility Manager. The Quantities of Gas exchanged between the Users are allocated in the form of QJA PEG-ATS by the Storage Facility Manager, under the following conditions: a. The transfer is made to the Storage Facility Manager, who in turn transfers the corresponding Quantity of Gas to the transferee, b. Following this exchange, the Minimum and Maximum Stock limits of both the transferor and the transferee must not be exceeded. Otherwise, the procedure described in article 7 of the General Terms and Conditions will apply. 6.6 Communication of the Final Daily Assessment By the fifteenth (15 th ) business day of Month M+1 at the latest, the Storage Facility Manager prepares the Final Daily Assessments for Month M based on the information provided by the Transport Network Manager. 6.7 Modification of the Final Daily Assessment The Final Daily Assessment may be modified by the Storage Facility Manager, under the same conditions as above, up to sixty (60) days following modifications to the Assessment made by the Transport Network Manager. Natural Gas Storage Contract Appendix C: Storage Operational Conditions 14

15 ARTICLE 7. COORDINATION 7.1 Operations meetings Once a year, an operations meeting comprising representatives of the Customer and of the Storage Facility Manager will be held. The purpose of this meeting is to: a. review the operating conditions, and in particular to examine the schedule for any works on storage facilities that could have an effect on periods of capacity reduction, b. analyse any incidents encountered, c. analyse the information exchange procedures. The frequency of these operations meetings may be modified by mutual agreement of the Parties. 7.2 Contact details The contact details (postal and addresses, telephone, fax) of the respective contacts of the Customer and the Storage Facility Manager that are involved in the execution of the Contract are given in the Supplementary Conditions. ARTICLE 8. DATA COMMUNICATION MEANS AND METHODS 8.1 Main means of communication The means of communication between the Customer and the Storage Facility Manager is: a. File transfer in Edigas, XML or CSV format, with automated transfer for: monthly and weekly forecasts of Daily Quantities of Gas, Daily Notifications, revised Daily Notifications, Daily Schedule, Daily Assessment, Limits, The acknowledgement of receipt of Daily Notifications and revised Daily Notifications, b. Telephone, and publications on the TIGF website for anticipated capacity reductions on Day D-5, c. and publications on the TIGF website for seasonal forecasts of monthly Quantities of Gas and for forecasts of periods of reduced capacities. Where automated communication is used, it is necessary to use an acknowledgement message that complies with the specifications of the Storage Facility Manager. This is to ensure that the various messages have been properly received. Natural Gas Storage Contract Appendix C: Storage Operational Conditions 15

16 8.2 Means of communication if the main method fails If the communication system specified in article 8.1 fails, information will be exchanged via or fax. Where applicable, the Storage Facility Manager notifies the Customer of this by telephone and informs him of the period of time during which or fax will be used as the back-up communication means. 8.3 Format of the exchanged information The Storage Facility Manager provides the Customer with: a. the detailed specifications of the Edigas, XML or CSV messages, b. Excel formats, which should be used in case of a communication failure, for elements sent by fax or . The Customer undertakes to use the formats and communication means specified by the Storage Facility Manager at the time of signing the contract, and to adapt to any future changes in formats and communication means. Natural Gas Storage Contract Appendix C: Storage Operational Conditions 16