Elexon explains the methodology used to review and recalculate Unmetered Supplies (UMS) Switch Regime Burn Hours under the BSC in 2010.

<div data-id="background" style="text-align:left">Background</div>

<div data-id="step-1" style="text-align:left">Step 1: Calculating the average offset at the PECU Array</div>

<div data-id="step-1" style="text-align:left">Step 1: Extrapolating the results by <u class='defined-term'>GSP Group</u></div>

<div data-id="step-2" style="text-align:left">Step 2: Defining a baseline set of data for each <u class='defined-term'>GSP Group</u> removing deemed weather effects</div>

<div data-id="step-3" style="text-align:left">Step 3: Defining the net annual effect of weather by GSP</div>

<div data-id="step-4" style="text-align:left">Step 4: Defining the minutes per Lux difference effects for PECUs</div>

<div data-id="step-5" style="text-align:left">Step 5: Extrapolating the data to different PECU types: Annual difference by PECU type</div>

<div data-id="step-5" style="text-align:left">Step 5: Extrapolating the data to different PECU types: Completing the calculation</div>

<div data-id="the-methodology" style="text-align:left">The Methodology</div>

<div data-id="part-night-pecus" style="text-align:left">Part Night PECUs</div>

CONTENTS

Burn Hours Review Methodology Statement V4.0

Defined Terms

Cross-references