DISCOM

What a DISCOM is

A DISCOM (Distribution Company) is the electricity utility responsible for distributing power from the high-voltage transmission network to end consumers (homes, businesses, industries, farms, and government users). Every Indian state has at least one DISCOM, and most states have several DISCOMs covering different geographic regions or consumer categories.

The DISCOM operates the distribution network of high-tension (HT) and low-tension (LT) lines that deliver electricity from substations to the consumer’s meter. It also handles billing, metering, customer service, connections, outage management, and increasingly the implementation of net metering for rooftop solar.

For solar customers, the DISCOM is the primary government interface for net metering, grid connection, and billing matters. While the State Nodal Agency administers subsidy schemes and the SERC sets policy, the DISCOM is where day-to-day customer interactions happen.

DISCOM structure in India

India’s electricity reform history has shaped the DISCOM structure significantly.

State-owned DISCOMs: Most states have unbundled their state electricity board into separate transmission and distribution entities. The DISCOM portion typically has 2 to 6 utilities per state, often covering different geographic regions.

Private DISCOMs: A few metro areas have private DISCOMs operating under regulatory frameworks. Examples: BSES Rajdhani and BSES Yamuna in Delhi, Tata Power Delhi Distribution, BESCOM-managed BMA in Bengaluru, Mumbai’s Adani Electricity and Tata Power, Kolkata’s CESC.

Holding companies: Many states have a holding company (like GUVNL in Gujarat) that owns the multiple DISCOMs and the state transmission utility.

The fragmentation creates complexity for multi-state solar developers and for consumers in cities with multiple utilities.

Major Indian DISCOMs

The list is illustrative; smaller utilities and licensee areas exist within several states.

What DISCOMs do

Network operation: Operate, maintain, and upgrade the LT and HT distribution networks (substations, transformers, poles, lines).

Connections: Provide new electricity connections to consumers, including residential, commercial, industrial, and agricultural categories.

Metering: Install energy meters at consumer premises, conduct meter reading, manage meter replacements.

Billing: Generate monthly or bi-monthly bills based on consumption, demand, and applicable tariffs.

Tariff implementation: Apply tariffs as approved by the state SERC, including special categories for solar net metering.

Customer service: Handle complaints, outage reports, connection requests, and grievance redressal.

Outage management: Restore power after faults, plan maintenance shutdowns, coordinate with transmission for system issues.

Net metering: Process applications for rooftop solar, install bidirectional meters, sign net-metering agreements, manage monthly settlement.

Subsidy administration: Coordinate with State Nodal Agencies on subsidy schemes affecting consumers.

Empanelment: Maintain lists of approved solar installation vendors for DISCOM-administered programmes.

DISCOM’s role in rooftop solar

When a residential or commercial customer wants to install rooftop solar with net metering, the DISCOM is involved at multiple stages.

Application: The customer’s empanelled installer submits a feasibility application to the DISCOM, including site details, system specifications, and electrical drawings.

Feasibility study: The DISCOM verifies that the distribution network can accept the proposed solar export. Some sites may need transformer or feeder upgrades.

Sanction: After verification, the DISCOM sanctions the solar installation with specific capacity, voltage, and metering details.

Bidirectional meter installation: The DISCOM (or the customer through DISCOM-approved vendor) installs a bidirectional meter that records both import and export.

Net-metering agreement: A formal contract between the customer and DISCOM specifying the net-metering arrangement, billing, settlement, and other terms.

Commissioning: The DISCOM verifies that the installation is functional and grid-compliant before authorising commissioning.

Monthly billing: The DISCOM generates monthly bills accounting for net consumption (grid import minus solar export).

Annual settlement: At the end of the financial year, any unused export credits are settled per state policy.

DISCOM financial health and policy impact

Many Indian DISCOMs face significant financial stress due to:

Aggregate Technical and Commercial (AT&C) losses: A combination of technical losses (line resistance) and commercial losses (theft, billing errors, non-payment). AT&C losses in Indian DISCOMs typically range from 12% to 25%.

Subsidy backlogs: State governments often delay subsidy payments to DISCOMs for residential and agricultural consumers, accumulating receivables.

High-cost power purchase agreements: Legacy PPAs at high tariffs increase DISCOM’s average cost of supply.

Tariff revisions: SERCs sometimes constrain tariff revisions for political reasons, squeezing DISCOM margins.

The financial stress affects solar:

DISCOMs may resist solar net metering applications because the consumer’s reduced grid purchase removes revenue while overheads remain.

DISCOMs may delay net metering processing.

DISCOMs may push back against open access and rooftop solar growth.

The Central Government’s UDAY (Ujwal DISCOM Assurance Yojana) and Revamped Distribution Sector Scheme (RDSS) have attempted to address DISCOM finances, with varied success.

DISCOM-customer relationship for solar

For most rooftop solar customers, the DISCOM relationship continues throughout the solar plant’s life:

Net metering monthly settlements.

Annual end-of-year settlement of unused credits.

Any system changes requiring DISCOM approval (capacity upgrade, new meter, location change).

Customer grievance resolution.

Periodic meter testing or replacement.

A good working relationship with the DISCOM, often facilitated by an experienced solar installer or EPC contractor, smooths these ongoing interactions.

Common mistakes regarding DISCOMs

Treating all DISCOMs as identical. Implementation practice varies significantly across utilities.

Skipping DISCOM verification when buying or selling property with rooftop solar. The agreement must be transferred to the new owner.

Not maintaining records of net-metering agreement, meter installation, and inspection. These documents are essential for future warranty and service issues.

Trying to bypass DISCOM by under-the-table arrangements. This creates legal, technical, and contractual risks.

Forgetting that DISCOMs are state-specific. A vendor familiar with one state may not understand another’s DISCOM processes.

Best practices

Choose solar installers familiar with the local DISCOM’s processes and empanelment.

Verify the DISCOM’s current net-metering policy and turnaround times before committing.

Maintain copies of all DISCOM communications, applications, and agreements for the solar plant’s life.

For multi-state operations, develop a DISCOM-by-DISCOM tracker of policies, contacts, and procedures.

Engage with the DISCOM’s customer service for issues, escalating to state grievance redressal forums if necessary.

For large commercial projects, build relationships with senior DISCOM staff for smoother implementation.

Standards and references

DISCOMs operate under the Electricity Act 2003, CEA Connectivity Regulations 2019, state SERC orders, and applicable consumer rights frameworks. Each DISCOM publishes its own website with customer service contacts, tariff schedules, and net-metering procedures.

Related glossary terms

• Net Metering
• SERC
• CERC
• DISCOM Empanelment
• Sanctioned Load
• Contract Demand
• HT vs LT Connection
• Power Purchase Agreement
• PM Surya Ghar Yojana

Key takeaways

A DISCOM (Distribution Company) is the electricity utility responsible for distributing power from the transmission network to end consumers in India. Every state has one or more DISCOMs handling connections, metering, billing, outages, and customer service. For solar customers, the DISCOM is the primary government interface for net metering, grid connection, and billing matters. DISCOM financial health and operational quality varies significantly across states and utilities, affecting solar implementation. Working effectively with the local DISCOM is essential for successful rooftop solar adoption.