WESTERN POWER DISTRIBUTION (SOUTH WEST) plc Business Carbon Footprint 01/04/2011 to 31/03/2012 Commentary and Methodology July 2012 1
Table of Contents 1.0 Business Carbon Foot Printing Reporting Table 3 2.0 Introduction to Commentary and Methodology 4 3.0 Building Energy Usage 5 Buildings Electricity Buildings Other Fuels Substations Usage 4.0 Operational Transport 6 Road Rail Sea Air 5.0 Business Transport 8 Road Rail Sea Air 6.0 Fugitive Emissions 9 SF6 7.0 Fuel Combustion 10 Diesel Natural Gas Gas Oil (Isles of Scilly) Other Fuels Page No. 2
1.0 Business Carbon Foot Print Reporting Table South West Business Carbon Footprint from 01/04/2011 to 31/03/2012 Emission Building energy usage Buildings Electricity Buildings Other fuels Substations usage Operational Transport Road Rail Sea Air Business Transport Road Rail Sea Air Fugitive Emissions tco2e 8,424.20 4624.20 16.0 3784.00 8,630.85 8402.0.00 0.07 228.78 771.43 697.22 2.3 0.11 71.8 4,708 SF6 Fuel Combustion 1,296.36 Diesel 1277.12 Natural Gas 0 19.24 Other fuels, as applicable* Total Business Carbon Footprint 23830.84 3
2.0 Introduction to Commentary and Methodology The information provided throughout this commentary and the Business Carbon Foot Printing Report (S.1) is submitted as part of the DPCR. The methodology utilised within the report follows UK Carbon Reporting guidance as provided by Defra and which is compliant with the principles of the Greenhouse Gas Protocol and the 2009 Guidelines to Defra / DECC s GHG Conversion Factors for Company Reporting (updated October 2010). In line with these principles the report aims to meet the following criteria to ensure its continued validity and authenticity. Relevant: the report and commentary remains reflective of the substance and economic reality of the company s business relationships. Complete: all relevant emission sources are included (although in practice lack of data or cost of gathering must be noted as a limiting factor). Consistent: accounting approaches, inventory boundary and calculation methodology have been applied consistently over reporting period. Transparent: information on the processes, procedures, assumptions and limitations of the BCF reporting are disclosed in a clear, factual, neutral and understandable manner, enabling internal and external verifiers to attest to its credibility. Accurate: GHG measurements, estimates, or calculations should be systemically neither over nor under the actual emissions value, as far as can be judged, and that uncertainties be reduced as far as practicable. Independent Verification Process The data has been reviewed internally by the Environment Team. Future returns will be audited as part of the WPD Corporate audit programme. Energy use data has been taken from the 2012 CRC submission, which has been compiled with the assistance of external specialist consultants Sustain. 4
3.0 Buildings Energy Use Summary Statement Summary Buildings Electricity Buildings Other Fuels Substations usage Total 4624.20 tco 2e 16.00 tco 2e 3784.00 tco 2e 8424.20 tco 2e Buildings Electricity (Scope 2) 2011/12 data presented is based upon actual billed consumptions (kwh) and downloaded SMART meter data. tco 2 e is determined using the current 2012 Guidelines to Defra/DECC GHG Conversion Factors for Company Reporting (published May 2012) Electricity emission factors from 1990 to 2010 per kwh (electricity generated) Table 3c 2010 Grid Rolling Average kg CO2 / kwh 0.51694 Summary Statement Buildings Electricity Use WPD South West Office tco 2e Avonbank 768 Avonbank Power House 2.6 Barnstaple 140 Bodmin 330 Bristol Airport 45 Bude 22 Crewkerne 28 Exeter 1,222 Falmouth* 4 Helston* 7 Kingsbridge* 9 Liskeard 12 Midsomer Norton 177 Pool 217 Plymouth 853 Tavistock** 10 Taunton 482 Torquay 93 Totnes 2 Weston-Super-Mare 148 ESP S West WPD Area 53 Total tco 2e 4624.20 * All or part data from billing information ** Estimated pro rata data from SMART data 5
Buildings - Other Fuels (Scope 1) One site within the South West region has a gas supply; the 2011/12 data presented is based upon the actual billed consumptions. 2011/12 total tco 2e gas use data presented is determined using the DEFRA Guidelines (published May 2012) 2010 Gas use conversion factor - Annex 1 - Table 1d Converting fuel types on an energy net CV basis. Scope 1 kg CO2 / kwh 0.20508 Summary Statement Buildings Gas Use WPD South West Office tco 2e Weston-Super-Mare 16 Total tco 2e 16 Diesel Usage Diesel is not currently used for Buildings Energy Use within WPD s South West region. LPG Usage LPG is not currently used for Buildings Energy Use within WPD s South West region. Substation Usage Summary Buildings Energy Use Substations SW Substations usage 7319407 Kwh Total 3784.00 tco2e Lowest unit price from estimated bills provided by the supplier have been used to calculate the number of units used. The tco2e is determined using the current 2012 Guidelines to Defra/DECC GHG Conversion Factors for Company Reporting, published May 2012. Electricity emission factors from 1990 to 2010 per kwh (electricity consumed) Table 3c 2010 Grid Rolling Average kg CO2 / kwh 0.51694 6
4.0 Operational Transport (Scope 2) Summary Statement Summary Road 8402.00 tco 2e Rail 0.00 tco 2e Sea 0.07 tco 2e Air 228.78 tco 2e Total Operational Transport 8630.85 tco 2e Operational Transport Road Operational road transport emissions currently take into account the following contributions; WPD operational fleet vehicles Fleet vehicles operated by External Service Providers Summary Statement Operational Transport - Road tco 2e WPD (South West) Fleet 5126.00 External Service Providers 3276.00 Total tco 2e 8402.00 Assumptions (Road) WPD South West fleet data based on fuel data analysis (fuel cards) provided by WPD Fleet Services. Figures based on Defra May 2012 Guidance Annex 6, Table 6a - Standard Road Transport Fuel kg CO2 / unit conversion factor for diesel - diesel = 2.6569 petrol = 2.3051 LPG = 1.5301. ESP data based upon fuel cards and vehicle work books. WPD South West accounts for approximately 70% of the Logistics transport contractor s WPD operations. Operational Transport Rail There are no WPD rail operational transport uses within the South West region. 7
Operational Transport Sea Operational sea transportation is limited to the shipment of diesel fuel from the UK mainline to the Isles of Scilly. The tco 2e has been determined using the Defra May 2012 Guidance; Annex 7, Table 7g Maritime Shipping Freight Distance conversion factors General Cargo Average; kg CO2 / unit 0.01305 South West Summary Statement - Sea Weight (tonnes) Distance (km) Trips per year Tonne km travelled kgco 2 per tonne.km Total tco 2e 26 37 4 3848 50.21 0.050 Assumptions (Sea) Weight of annual diesel use based on full load volume of 31 000 litres, weight per litre = 0.84 kg = 26040 Kg = 26 tonnes (1000kg = 1 t) On average the Isles of Scilly depot receive four full loads of diesel per annum. Operational Transport Sea ESP South West ESP Summary Statement Sea Total ESP passenger km s 212.42 Total tco 2e 0.02 Defra Guidance published May 2012 Annex 6 table 6k Taxi, Bus, Rail and Ferry Passenger Transport Conversion factors Ferry Car passenger kg CO / unit 0.13216. Operational Transport Air South Western Helicopters South West Summary Statement - Air Helicopter Hours Litres Fuel tco 2e G-BARP Single Engine 54.7 4375 11.05 G-MFMF 26.08 129.1 10326 Single Engine G-ZAPH 37.52 185.7 14857 Single Engine G-LECA 47.10 116.6 18649 Twin Engine G-OHMS 29.31 72.5 11606 Twin Engine G-WPDA Twin Engine 46.8 9357 23.63 G-WPDB Twin Engine 68.1 13616 34.39 Hired 3.71 18.4 1469 Single Engine General Allocation 49.92 6295 15.89 Totals 741.82 90550.00 228.68 8
Assumptions (Air) Fuel figures based upon flying hours and the assumption that average fuel usage is; 80 litres per hour for Jet Ranger type single engine helicopter 160 litres per hour for the twin engine Twin Squirrel Conversion factor of 2.5258 Kg/litre for jet kerosene (aviation turbine fuel) taken from Defra Guidance (published May 2012) Annex 1 Fuel Conversion Factors, Table 1b for kg CO2 / unit. Flying hours data extracted from flying hours log for each aircraft. WPD usage extracted from Consortium usage figures. The helicopters are owned / operated by a consortium of Scottish & Southern, UKPN, Midlands, South West and Wales. They are also used for a small percentage of charter work. Figures exclude testing hours The general allocation for Southwest represents 30% of the total WPD generic flight hours Operational Transport Air ESP South West ESP Summary Statement Air Total ESP passenger km s 1110.41 Total tco 2e 0.1 Defra Guidance published May 2012 Annex 6 table 6l Air Passenger Transport Conversion factors Domestic Average kg CO2 / unit 0.16513 9
5.0 Business Transport (Scope 1) Summary Statement Summary Road Rail Sea Air Total Business Transport 697.22 tco 2e 2.3 tco 2e 0.11 tco 2e 71.8 tco 2e 771.43 tco 2e Business Transport Road Total mileage data presented includes all business mileage from company cars and private cars used on business based on mileage claims processed by Payroll The data does not include employee travel to and from work. It also includes ESP business travel where this has been captured by the ESP via their own mileage claims system. South West Summary Statement - Road Total WPD S West unknown fuel km 2502962.399 Total S West ESP Diesel km 1149584.14 tco2e (unknown fuel) 484.32 tco2e (diesel) 212.90 Total tco 2e 697.22 Assumptions (Road) The mileage claims system is unable to record fuel type for the miles claimed, so the conversion factor from Defra Guidance published May 2012 Annex 6, table 6e Passenger Road transport conversion factors Cars (unknown Fuel ) Average Car 0.19350/km kg CO2 / unit has been used for the period 1 April 2011 to 31 March 2012. Defra 2012 Guidance Annex 6, Tables 6b, c and d - Standard Road Transport Fuel conversion factors diesel, petrol and alternative fuel cars kg CO2 / unit 0.20108/km, 0.18520/km and 0.21297/km respectively to petrol, diesel and LPG vehicles have been used for ESP km where the fuel type is known Business Transport Rail South West Summary Statement Rail Total rail km travelled 42191 Total tco 2e 2.3 Rail travel information has been provided by the travel booking company from their internal system. Defra Guidance published May 2012 Annex 6, table 6k Taxi, Bus, Rail and Ferry Passenger transport conversion factors kg CO2 / vkm 0.05501 has been used for the period 1 April 2011 to 31 March 2012 10
Business Transport Sea South West Summary Statement Sea Total passenger km s 975 Total tco 2e 0.11 Assumptions (Sea) Conversion taken from Defra Oct 2012 Reporting Guidelines Annex 6, Table 6k (Passenger Transport Average passenger) kg CO2 / unit 0.11516 kgco2e Business Transport Air tco 2e Midlands Acquisition Domestic 15.11 International and Domestic general 50.09 Isles of Scilly helicopter 6.6 71.80 Total Assumptions (Air) Flight distances calculated from http://www.prokerala.com/travel/airports/distance Domestic conversion factor Annex 6 of DEFRA 2012 GHG Guidance - Table 6I - Average domestic - Total Direct GHG - 0.16685 Short haul international conversion factor (average) Annex 6 of DEFRA 2012 GHG Guidance - Table 6I Total Direct GHG - 0.09522 Long haul international conversion factor (average) Annex 6 of DEFRA 2010 GHG Guidance - Table 6I - Business class long haul - Total Direct GHG - 0.23066 Business Transport Air - Isles of Scilly Helicopter flights. Isles of Scilly Helicopter flights 2011-2012 # return flights tco 2e Total number of flights 78 6.6 Assumptions The Sikorsky S61N passenger helicopter carries 19 passengers (estimated utilisation of 16 passengers per flight on average). S61N uses 170 US gallons /hr jet kerosene (1 litre = 0.2641 US gallons = 643.52 litres / hour) Flight time is 20 minutes outbound; 30 minutes inbound per round trip. One return flight = 50 minutes, a return flight therefore uses (5/6 * 643.53/16) = 33.5167 litres fuel per person per return flight. Using the conversion rate of 2.5278 Kg CO 2 /litre of jet kerosene (aviation turbine fuel) from Annex 1 Fuel Conversion Factors, one return flight = 84.462 Kg CO 2 11
6.0 Fugitive Emissions (Scope 2) SF 6 Sulphur Hexafluoride For the purposes of this report only SF6 fugitive emissions for the regulatory year (Apr 11 Mar 12) have been included. These have been calculated by assuming a 0.1% leakage of the total volume of SF 6 and any known occasions of topping up of equipment. Gas lost to Apr 11 Mar tco environment 12 (kg) 2e WPD South West 197 4708 Total (Kg) 197 4708 Above based upon the global warming potential (GWP) of SF 6 = 23900 (i.e. 1kg of SF 6 is equivalent to 23900kg of CO 2 ) as per Table 5a, Annex 5 of the 2012 Defra Guidelines 7.0 Fuel Combustion (Scope 1 / 3) Summary Statement Summary Fuel Combustion South West Diesel 1277.12 tco2e Natural Gas 0.00 tco2e Gas Oil 19.24 tco2e Total 1296.36 tco2e Diesel Combustion Diesel Combustion Litres Used tco2e WPD_SWest area 48 0.12 WPD Scilly Isles fuel 79865 212 ESP WPD_SWest 400936 1065 Total 480849 1277.12 Conversion factor taken from 2012 Defra Guidance Annex 1, Table 1d Converting fuel types by unit volume diesel kg CO2 / unit 2.6569. Information is taken from standby generator records and ESP fuel purchase information. Fuel Records from Isles of Scilly staff (Network Services) compared projected and actual fuel data available on monthly basis. 12
Gas Oil Gas Oil Combustion Litres Used tco2e ESP WPD SWest area 71288 19.24 Total 71288 19.24 Conversion factor taken from 2012 Defra Guidance Annex 1, Table 1d Converting fuel types on energy, net CV diesel kg CO / unit 0.26991.Information is taken from ESP fuel purchase information. Natural Gas Combustion Currently there is no natural gas fuel combustion associated with WPD South West activities 13