Battery energy storage systems as storage service, not generation; GST applies at 18% and registration required.

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....Battery energy storage systems (BESS) are characterised as storage facilities that convert electrical energy to chemical energy and back, and therefore are not generation, transmission or distribution utilities; accordingly, exemption notifications for generation/transmission/distribution do not apply, whether BESS is standalone or co located. The activity of developing and operating BESS does not amount to supply/generation of electricity for the notified exemptions, so those nil rate/exemption entries are inapplicable. The service is classifiable as support services to electricity transmission and distribution (HSN 998631), liable to GST at 18%, and the operator must register for GST in Tamil Nadu if the BESS is established there.....