To provide reliable and quality electricity to citizens of Kolkata, India, the Calcutta Electric Supply Company (CESC) decided to upgrade their distribution system using the latest technologies. CESC, in consultation with the U.S. Trade and Development Agency, selected Tetra Tech to conduct a feasibility study to develop requirements and specifications for a smart grid implementation roadmap. The study examined potential improvement for the efficiency and reliability of CESC’s 2.8-million-customer distribution system in Kolkata. The feasibility study included the design of a smart grid pilot project and assessment of the technological, economic, regulatory, and financial viability and social and environmental impacts of implementing smart grid projects in the CESC network. It also included recommendations for integrating enterprise applications.

Thank you for the Task 3 Report, which is excellent and prepared with a lot of diligence, understanding of our needs, and ESTA/Tetra Tech’s immense expertise. The Smart Meter Spec is very comprehensive and will help us as a model and guide in pilot rollouts and procurement and scale-up for such meters in the days to come.

Debasis Gupta, General Manager, Planning, CESC Limited, Kolkata

Tetra Tech reviewed and analyzed the requirements and recommendations for a pilot project and system-wide upgrades. Upgrades included distribution system automation, telecommunications upgrades to IT system plans, integrating smart meters, home area networks, and other relevant smart grid interactive communication technologies and management systems into the CESC distribution and management system. Our team reviewed the efficiency and challenges of CESC’s current distribution system and identified major bottlenecks for implementing smart grid technologies in the distribution system. We examined how these plans should address the smart grid pilot project and the eventual expansion to the entire distribution system.

Tetra Tech suggested small trials with ring monitoring units and with pilots of advanced metering infrastructure. A through-voltage profile study was conducted on approximately 1,000 feeders from 33 kilovolt (KV) to 6.6 KV. In addition, feeders for volt-var compensation were identified for improving reliability of power supply. Tetra Tech studied CESC’s existing SCADA system at 132 KV and 33 KV and made recommendations to incorporate the latest technological development in areas such as inclusion of outage management systems and an energy management system. Tetra Tech found that the smart grid project and technology solutions would immediately help in CESC’s ongoing quest to improve the quality and reliability of service while reducing technical and commercial power losses.

Finally, Tetra Tech assessed the impact of the smart grid on society and the environment in general. Tetra Tech made suggestions to mitigate the negative impacts on society and the environment such as utilization of manpower spared due to automation and disposal of existing 3 million meters in an environmentally friendly way.