This article provides a detailed explanation of Sections 4 to 11 of the GISS-23-1 Regulations, available on the TNERC website. https://www.tnerc.tn.gov.in/website/Regulation.aspx
https://www.tnerc.tn.gov.in/Regulation/files/Reg-221020211743Eng.pdf
The section 4 establishes who can participate in each GISS mechanism and the applicable capacity boundaries, providing the starting point for selecting the right regulatory pathway for a solar project.
The physical arrangement of meters depends on the selected GISS mechanism. The section 5 maps the metering architecture for Net Metering,
Net Billing and Gross Metering, including ToD and multiple-inverter configurations.
The three GISS mechanisms translate solar generation into consumer billing in fundamentally different ways. The section 6 compares unit-based settlement, monetary settlement and direct payment for gross generation.
Solar capacity is constrained not only by the consumer’s sanctioned load but also by the cumulative capacity connected to the distribution or power transformer. The section 7 brings these grid-level limits into focus.
GISS implementation also places responsibilities on the distribution licensee, from enforcing technical standards and upgrading billing systems to providing transparent data and publishing transformer-wise solar capacity information.
The point at which the solar system interfaces with the distribution network determines the applicable infrastructure and responsibilities. The section 8 contrasts the interface arrangements for Net Metering/Net Billing and Gross Metering.
Anti-Islanding & Hazard Prevention: Grid safety is fundamental to GISS operation. The section 8 explains Automatic isolation during grid failures and the restrictions on battery or DG backup systems to prevent unintended back-feeding into the distribution network.
Accurate and reliable energy accounting depends on compliant metering infrastructure. The section 9 covers meter accuracy, communication capability, Time of Day(ToD) functionality, check-meter provisions and the procurement, testing and installation process.
Network charges reflect the cost of maintaining the grid infrastructure required for parallel operation of GISS. The section 10 explains their applicability to Net Metering and Net Billing and the different treatment under Gross Metering.
This page provides a detailed explanation of Sections 4 to 11 of the TNERC GISS-23-1 Regulations, 2021, covering Grid Interactive Solar PV Energy Generating Systems (GISS) in Tamil Nadu. It explains eligibility criteria, Net Metering, Net Billing and Gross Metering, solar capacity limits, metering arrangements, Time-of-Day (ToD) metering, billing and energy accounting, distribution transformer capacity, distribution licensee responsibilities, grid interface requirements, anti-islanding protection, battery storage and DG backup, metering infrastructure, communication requirements, network and wheeling charges, application, approval and commissioning procedures. The article translates the TNERC GISS regulations into a practical systems engineering and technical perspective for solar PV developers, EPC companies, consumers and renewable-energy professionals.