GST on Retrofitting works for strengthening NPKRR Maaligai etc.

In re PSK Engineering Construction & Co. (GST AAR Tamilnadu) 1. What is the rate of GST to be charged on providing works contract services to TANGEDCO for carrying out retrofitting work for strengthening the NPKRR Maaligai against seismic and wind effect and modification of elevation in TNEB headquarters building at Chennai?  The rate of GST to be charged on the services provided by the applicant to TANGEDCO for carrying out retrofitting work for strengthening the NPKRR Maaligai against seismic and wind effect and modification of elevation in TNEB headquarters building at Chennai is 18% (...