Department of Management Sciences (DoMS) Indian Institute of Technology Kanpur

BRPL Letter dt. 17th April, 2023

Rooftop Solar send Renewable Purchase Obligation
07 November 2023 Keywords: Solar Rooftop Systems, Battery, Renewable Purchase Obligation, Capacity Utilisation Factor, Net Metering


Highlights:

Objective: To measure the Renewable Purchase Obligation (RPO) for the Solar rooftop systems having battery installed on the DC side of the system.

The letter in in reference to DERC (Net Metering for Renewable Energy) Regulations, 2014 and DERC (Group Net Metering and Virtual Net Metering for Renewable Energy) Guidelines, 2019. These regulations provide the pathway for the installation of renewable energy system (RES) with battery energy storage system (BESS).

A consumer intends to couple its solar plant with BESS on the DC side. Key components of the intended system are (i) solar meter for the measurement of total solar generation to estimate discom’s RPO and consumer’s generation based incentive (GBI), and (ii) separate backup wiring to prevent battery power to flow into the grid when the grid is not supplying electricity.

CER Opinion:

1. Introduction: The proposed configuration by BRPL provides for a bidirectional inverter wherein the battery can be charged both from the electricity generated from the PV panels or that imported from the distribution utility. The battery will thus be able to inject “non-green” electricity, which was drawn from the distribution utility, into the grid. 
This will lead to following issues- 
❖ This will make it difficult to estimate the proportion of green energy in the energy injected by a consumer under the prevailing net metering regulations. It will be challenging to estimate the correct RPO met by the distribution utility. 
❖ Under the proposed configuration, the battery may also be charged by drawing electricity from the distribution grid during the peak hours and discharged during the off-peak hours, thus further aggravating the peak load management of the distribution utility. 
Calculation of storage obligation



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