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The West Bengal Electricity Regulatory Commission (WBERC) has introduced draft regulations that outline the framework for grid-connected rooftop solar systems. These regulations enable consumers of any distribution licensee to install solar systems, allowing for both self-ownership and third-party ownership options. The maximum capacity for these installations is set at 100% of the consumer’s sanctioned load or contract demand to maintain grid stability.
To accommodate different system sizes, the WBERC has proposed two metering options. For systems up to 5 kW, net metering will be available, enabling consumers to offset their energy consumption with the electricity generated by their solar systems. In contrast, gross metering will apply to installations exceeding 5 kW, requiring separate accounting for the energy consumed and injected into the grid. The regulations stipulate that bi-directional meters must be installed to accurately track electricity imports and exports, ensuring fair energy accounting.
A detailed energy accounting and settlement mechanism is also part of these regulations. The energy produced by rooftop solar systems is primarily intended for self-consumption, with any excess energy exported to the grid credited to the consumer’s account. The settlement occurs monthly, allowing consumers to carry forward excess energy to future billing cycles. At the end of each financial year, any remaining surplus units will be forfeited, encouraging efficient energy usage while preventing large accumulations of credits.
The proposed tariff structures vary across consumer categories to ensure fair compensation for solar energy generation. Domestic consumers with systems up to 5 kW will receive a tariff equal to the average power purchase cost of their respective distribution licensee for any net excess energy injected. For commercial and industrial prosumers, the tariffs will be set by the Commission for that year. Special provisions have also been made for government buildings and institutions to encourage solar energy adoption in the public sector.
To ensure the reliability and safety of rooftop solar systems, the draft regulations emphasize compliance with established technical standards and safety measures. These include adherence to the regulations set by the Central Electricity Authority regarding the connectivity of distributed generation resources. Installation of safety equipment, such as manual disconnect switches and anti-islanding protection, is mandatory, along with regular maintenance and testing to ensure continued system performance and safety.
The implementation framework outlined in the regulations includes a simplified application process. Prosumers can apply online to the relevant distribution licensee, which must complete a technical feasibility assessment within 15 days. The licensee is then required to communicate its decision within 30 days, with the system needing to be commissioned within 180 days of receiving approval. This streamlined process aims to facilitate the adoption of rooftop solar systems while ensuring proper oversight.
The regulations also define the responsibilities of distribution licensees and prosumers. Distribution licensees are expected to assist in the interconnection process, perform technical feasibility studies, and manage proper metering and billing. Prosumers, on the other hand, are responsible for maintaining their systems, complying with safety standards, granting access for inspections and meter readings, and following the terms outlined in the interconnection agreement. This clear delineation of responsibilities is designed to ensure the smooth operation of rooftop solar systems.
Compliance with specific technical standards is crucial for maintaining grid stability and power quality. These standards include limits on harmonic current injection and maintaining power factors within specified ranges. Additionally, rooftop solar systems must have the capability to disconnect automatically in the event of a grid failure, ensuring safety and reliability for all users. |
