Priority Dispatch Under Network Congestion

Introduction

Network congestion occurs when the amount of electricity that market participants seek to transmit exceeds the safe technical capacity of a transmission or distribution network. In such circumstances, system operators may have to modify schedules or curtail generation to maintain grid security. Priority dispatch determines which generating resources receive preferential treatment when network capacity is limited. It is particularly relevant to renewable-energy generators because electricity from solar and wind projects is variable and often concentrated in specific geographical areas.

Legal Framework in India

The Electricity Act, 2003 establishes a framework for coordinated and secure electricity-system operation. Section 28 assigns functions to the Regional Load Despatch Centre (RLDC), including ensuring integrated operation of the power system and monitoring grid operations. Section 29 requires compliance with RLDC directions. Sections 32 and 33 provide corresponding responsibilities for State Load Despatch Centres.

Section 86(1)(e) requires State Electricity Regulatory Commissions to promote electricity generation from renewable sources. Thus, renewable-energy promotion must operate alongside transmission constraints and grid-security requirements. Priority dispatch cannot ordinarily be treated as an absolute right to inject electricity regardless of network limitations.

Priority Dispatch During Congestion

When congestion occurs, the system operator may need to redispatch or curtail some generating stations. A legally sound framework should establish objective criteria for deciding which resources are curtailed and the order in which curtailment occurs. These criteria should consider technical security, transmission limitations, contractual arrangements and applicable regulatory requirements.

Where renewable generators receive priority under applicable regulations, their generation should not ordinarily be curtailed merely for commercial convenience when other technically feasible measures are available. However, genuine system-security conditions may justify restrictions. Transparent scheduling, congestion identification, communication of curtailment instructions and appropriate settlement mechanisms are therefore important.

Long-term solutions include transmission expansion, improved forecasting, energy storage, demand response and better interconnection planning. These measures can reduce dependence on curtailment as a congestion-management tool.

Case Laws

In PTC India Ltd. v. Central Electricity Regulatory Commission (2010), the Supreme Court recognised the statutory authority of electricity regulatory commissions under the Electricity Act, 2003. The judgment supports the principle that market and dispatch regulations must remain within the statutory framework.

In State of Andhra Pradesh v. NTPC Ltd. (2002), the Supreme Court considered legal issues relating to electricity supply and transactions across State boundaries. The case illustrates the importance of coordinated legal and regulatory arrangements in an interconnected electricity system.

In Energy Watchdog v. CERC (2017), the Supreme Court examined contractual obligations and regulatory intervention in the electricity sector. The decision is relevant where congestion-related regulatory decisions have consequences for power-purchase agreements and other contractual arrangements.

Conclusion

Priority dispatch under network congestion requires a balance between renewable-energy promotion, contractual rights and secure grid operation. Indian law gives load despatch centres significant responsibilities for maintaining system security, while regulatory commissions have duties to promote renewable generation. Curtailment during genuine network constraints should therefore be technically justified, transparent and non-discriminatory. Clear regulatory procedures, transmission expansion and storage can reduce congestion-related curtailment while supporting reliable and efficient electricity-market development.