SUBSCRIBER NOTE: Platts proposes to amend hourly components of UK NBP EFA day-ahead gas assessment

Platts is proposing to modify the hourly components of its UK NBP EFA day-ahead gas assessment (GNEAV00) with effect from September 30, 2015, to align with an industry-wide change to the UK's gas day. The UK's gas day is changing from 06:00-06:00 to 05:00-05:00 from October 1, 2015, due to the introduction of EU Gas Balancing and Capacity network codes. Platts EFA day-ahead gas price is calculated daily as of 11:00 London time and provides a power-day-equivalent gas value based on intra-day gas assessments for within-day and day-ahead delivery. Platts EFA day-ahead gas price is also the gas component of the NASDAQ OMX UK Day-Ahead Spark Spread. The EFA day-ahead gas price is calculated using UK NBP gas Within-day (A) and Next-day (B) assessments. The current formula is: A*7/24 plus B*17/24. This reflects the difference between the 6am-start gas day and the 11pm-start EFA power day, but will need to be adjusted to account for the change in the gas day. On September 30, the gas day will be 23 hours long to account for the change. On that day the formula will be: A*7/23 plus B*16/23 Following that it will revert to a 24 hour calculation using the following formula: A*6/24 plus B*18/24 The assessments are published on European Power Alert pages 670 and 671, in the Platts UK NBP intra-day gas prices table in European Gas Daily, in the N2EX UK power auction, spark spread table in European Power Daily and in Platts Market Data category EG. Platts final decision on the proposed changes outlined above will take into account the results of shipper testing that is due to run from September 7-16. Platts invites feedback, comments and questions by September 15, 2015 to power@platts.com with copy to pricegroup@platts.com and nathan.richardson@platts.com. For written comments, please provide a clear indication if comments are not intended for publication by Platts for public viewing. Platts will consider all comments received and will make comments not marked as confidential available upon request.