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No 1 Configuration / Type Pumped Storage Power Station 2 Battery installed within a Large Power Station comprising Synchronous Generating Units 3 Battery installed within a Large Power Station comprising Power Park Modules Grid Code Treatment As per current Grid Code requirements applicable to Pumped Storage Power Stations Battery would need be considered as an VSC HVDC Unit with requirements applying at the point where it connects within the power station As per 2) above. Issue/Comment The connection arrangements could be complex (e.g. a connection at the Generating Unit Terminals or to a Transformer tertiary would mean that you have a BMU within a BMU which could cause commercial difficulties. Difficulties in incorporating a battery / storage device within a power park string. This would have complexities in terms of obligations on the Power Park Module and obligations on the Storage device. A solution may be to mandate that the Storage device has to have its own connection point and cannot be integrated into the power park module but this could be complex. There is also the risk of having a BMU within a BMU. 4 5 6 7 8 Battery connected directly to the Transmission or Distribution System Compressed air Energy Storage using Synchronous Generating Units Flywheels Superconductive Magnetic Energy Storage Systems Hydrogen storage Battery would be treated in the same way as a Voltage Source HVDC Converter As per 1) above As per 1) above – assuming they are connected to a synchronous Generators As per 4) above, but questions remain on short energy duration Multiple applications - Not applicable 9 Supercapacitors As per 4) above but questions remain on short energy duration. Note in all of the above cases, more detailed data submissions of the technologies would be required under the Planning Code in addition to amendments to the Data Registration Code. This would be necessary for modelling purposes which at the present time are quite limited.