1. ESB Networks MCR0177 – DG4 for Local Authority Public Lighting 23rd April 2010

2. 1 ESB Networks – MCR0177 DG4 for Local Authority Public Lighting Summary Information The DG4 Use of System tariff will apply to all unmetered public lighting and other unmetered load types where the registered customer is a local authority. Relevant Local Authorities include: Dublin Corporation, County Councils, Urban Councils, Borough Councils and NRA Load Types: All Public Lights types including: LED, PED, Boll, Beac, etc Burning Hour Calendar : Applicable to all three burning hour calendars - D2D, D2M & 24 Hr MP Status = E (Energised) Public Lighting registered to Private Developers, Private Public Partnerships and Harbour and Port Authorities will continue to be billed on DG3 Use of System tariff. Approx 40,000 TMPRNs are impacted by MCR 0177 and will be changed from DG3 to DG4 following go-live. The full list of all TMPRNs to be changed from DG3 to DG4 will be advised to the relevant suppliers in advance of that date.

3. 2 ESB Networks – MCR0177 DG4 for Local Authority Public Lighting Sequence of Events 1.The revised schema will issue on week ending 23 rd July 2010, and the Go-Live weekend for the schema upgrade will take place on the weekend of Friday 19th to Sunday 21st November. IPT requirements have yet to be discussed with Gemserv. 2. Change over of TMPRNs from DG3 to DG4 Starting early December and after completion of the DUoS Unmetered Billing that is scheduled for Dec 1st, Networks-ISU will run a script to change the DUoS Group from DG3 to DG4 for a portion of the affected TMPRNs Daily volumes of TMPRNs will be scheduled, and please note that throughput will be agreed in advance with each Supplier who is impacted by MCR0177 One 700 MM will be sent for each TMPRN that has been changed Ideally the change-over will be completed by Fri 17 th Dec, but could potentially be extended if needed up to 22 nd Dec and by agreement with individual Suppliers 3.The DUoS Unmetered billing for December 2010 charges is scheduled for 3rd January 2011. Note that all DG3 and DG4 MPRNs will be billed at the same DUoS rates, whatever is current at that time. 4.DUoS Rates for DG4 will be changed in ESB Networks system during January 2011 effective from 1st Jan 2011 5.The Unmetered billing for Jan 2011 charges is scheduled for 1st February 2011 DG3 and DG4 MPRNs will be billed at different rates. As normal, a 701 MM will be sent for every TMPRN And please note that dates are approximate and subject to further refinement and also agreement with IGG