UK Power Indices Specifications
8-9am Day Ahead Index
The Day Ahead Window Index is calculated using a volume-based, weighted average of all day ahead baseload trades executed in London by contributing brokers between 0800hrs and 0900hrs London time each day. The Index values electricity trades for baseload delivery on the day, or days in the case of weekends, following the deal date (Trade Day). The delivery day is the Index day. In the Index, weekends shall be calculated using a volume-based, weighted average of all weekend trades executed in London by contributing brokers between 0800hrs and 0900hrs London time on the previous business day. The Index will be published daily at 0800hrs London time. In the calculation of the Index, previous business day convention shall apply.

Day Ahead Window Index
The Day Ahead Window Index is calculated using a volume-based, weighted average of all day ahead baseload trades executed in London by contributing brokers between 0800hrs and 1200hrs London time each day. The Index values electricity trades for baseload delivery on the day, or days in the case of weekends, following the deal date (Trade Day). The delivery day is the Index day. In the Index, weekends shall be calculated using a volume-based, weighted average of all weekend trades executed in London by contributing brokers between 0800hrs and 1200hrs London time on the previous business day. The Index will be published daily at 0900hrs London time. In the calculation of the Index, previous business day convention shall apply.

Working Days Index
The Working Days Index is calculated using a volume-based, weighted average of all day ahead baseload trades executed in London by contributing brokers between 0800hrs and 1700hrs London time on Trade Day. The Index values electricity trades for baseload delivery on the working day following Trade Day. The delivery day is the Index day. Weekends shall not be included in the Index. The Index will be published daily at 0900hrs London time. In the calculation of the Index, previous business day convention shall apply.

Monday - Friday Peak Index
The Monday-Friday Peak Index is calculated using a volume-based, weighted average of all day ahead peak trades executed in London by contributing brokers between 0800hrs and 1700hrs London time on Trade Day. The Index values electricity trades for peakload delivery on the working day following Trade Day. The delivery day is the Index day. The Index will be published daily at 0900hrs London time. In the calculation of the Index, previous business day convention shall apply.

All Days Index
The All Days Index is calculated using a volume-based, weighted average of all day ahead baseload trades executed in London by contributing brokers between 0800hrs and 1700hrs London time on Trade Day. The Index values electricity trades for baseload delivery on the working day following Trade Day. The delivery day is the Index Day. Weekend and Monday prices incorporated in the Index shall be calculated using a volume-based, weighted average of all day ahead baseload trades executed by contributing brokers on Friday between 0800hrs and 1700hrs for Saturday, Sunday and Monday individually. In the calculation of the Index, previous business day convention shall apply. Should no trades be transacted on both Saturday and Sunday individually, but trades are transacted in the combined weekend period, the volume-based, weighted average of all the combined weekend period trades executed in London by contributing brokers on Friday between 0800hrs and 1700hrs London time for the weekend shall be used to calculate prices for Saturday and Sunday in the Index (click here for more detail). The Index will be published daily at 0900hrs London time.