<p>The information following is from National Grid and is based on a snapshot taken for the current Short Term Operating Reserve season (Season 7.4—23 September 2013 to 28 October 2013).</p><p>STOR contracts (as of 23 October 2013)</p><p>National Grid has awarded 152 individual contracts for Season 7.4, representing a total MW position of 3,136 MW. On a weekly basis National Grid looks to ensure that 2,300 MW is made available to their Control Room.</p><p>47 of these contracts were tendered on a flexible basis and as a result may not be made available or have their availability accepted week to week. The flexible contracts represent 427 MW.</p><p>STOR unit size (for contracts in place at 23 October 2013)</p><p>The size of each individual site contracted for Season 7.4 ranges from between 3 MW to 300 MW. However, the bulk of sites are <50 MW. A high level breakdown is detailed as follows:</p><p><table><thead><tr><td valign="top">MWRange<br /></td><td valign="top">Numberof STOR Sites Contracted in Season7.4<br /></td><td valign="top">MWTotal in eachrange<br /></td></tr></thead><tbody><tr><td valign="top">3MW to 10MW<br /></td><td valign="top">67<br /></td><td valign="top">405MW<br /></td></tr><tr><td valign="top">11MW to 20MW<br /></td><td valign="top">51<br /></td><td valign="top">834MW<br /></td></tr><tr><td valign="top">21MW to 30MW<br /></td><td valign="top">12<br /></td><td valign="top">303MW<br /></td></tr><tr><td valign="top">31MW to 50MW<br /></td><td valign="top">14<br /></td><td valign="top">537MW<br /></td></tr><tr><td valign="top">51MW to 100MW<br /></td><td valign="top">4<br /></td><td valign="top">260MW<br /></td></tr><tr><td valign="top">100MW+<br /></td><td valign="top">4<br /></td><td valign="top">797MW<br /></td></tr></tbody></table></p><p>STOR contract duration (for contracts in place at 23 October 2013)</p><p>389 MW of these contracts were signed under the Long Term STOR opportunity in 2010 and are on contract till March 2025.</p><p>The remaining 2,747 MW are on contracts agreed under the standard, shorter duration (two year maximum), tender opportunity.</p>