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Anaerobic Digestion of farm and food processing residues GoodPractice Guidelines Page39 Method statement Most larger AD projects will be subject to the Construction (Design and Maintenance) (CDM) regulations, except projects which take less than 30 days for construction, or less than 500 person work days. A method statement may also be required as part of the planning permission. This should be drafted by the developer, and discussed with the planning officers, the building control officers and the environmental health department of the relevant local authority and with community representatives and local people. This will help to demonstrate that the developer has thought about the possible problems and their mitigation, as well as about residual impacts and how to address them. The issues the method statement should address are outlined in the Box above. Electricity connection capacity of the AD plant and the relative parameters of the immediate distribution network. The cost of connection could vary considerably depending on where the AD plant is located within the REC’s distribution network. The cost of connection will in part reflect the distances involved. However, because the REC for operational and economic reasons needs to use standard component sizes for its own assets, the connection cost will not tend to rise smoothly with increasing plant capacities, but will tend to increase in steps as the thresholds for requiring particular assets and voltage levels are crossed. If the developer has some flexibility as to where the plant can be located within a particular area, they should discuss with the REC the respective connection costs for different sizes of generator and, if practicable, size and locate the installation accordingly. In some cases, some benefits may also accrue to the local REC and/or the licensed second tier supplier who contracts to sell the electricity and it may be possible to negotiate agreements to optimise the costs to the developer and maximise the value of the energy generated. A summary of the options, benefits and the associated agreements, contracts and licence requirements is given in Appendix 6. Training Good practice requires that all operators of AD plants are trained to the highest possible standards in the engineering aspects of the running of the equipment, be trained in and fully understand the health and safety aspects, and be trained to recognise problems and how to respond to them. Farmers and developers may obtain training on the use of equipment from manufacturers and equipment suppliers. A number of consultants can also offer training on health and safety and operating procedures. Monitoring An AD project should be regularly monitored in order to: • Optimise economic and environmental performance • Assess quality control of feedstock and products regularly If an AD plant is constructed on a new site it will generally require an electricity connection to the local electricity distribution network to provide energy to operate ancillary equipment and other site loads during maintenance and shut-down periods, unless stand-by generation equipment is also installed. An electricity connection and appropriate import/export metering will be required if the gas produced by an AD plant is to be used to generate electricity which cannot be consumed within the curtilage of the plant and associated businesses. The operator will then have to decide on a number of trading options depending upon the size and location of the generator and to whom the electricity is sold or consumed, and address various technical, regulatory, commercial and contractual issues. The risks and benefits with each option will need to be appraised and understood by the prospective developer to maximise the value of the energy generated and to ensure that the appropriate agreements, contracts and licenses are entered into by the developer. The Regional Electricity Company (REC) has statutory obligations under the Electricity Act 1989 in respect of the safety and quality of electricity supply to its customers and will determine the method and the point at which connection can be made to the distribution network, depending upon the exportPDF Image | Anaerobic Digestion Of farm and food Processing residues The development of a sustainable industry
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