The main function of distribution companies (DISCOs) are

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Option D: All of above

Explanation & Concepts:
Distribution companies (DISCOs) act as the final link in the power sector, responsible for the commercial procurement of electricity and the technical management of the low-voltage network. Their role integrates both the procurement of energy from wholesale markets and the operational maintenance of the distribution infrastructure to ensure supply to end-users.

Working Principle: DISCOs operate under a regulated framework where they purchase electricity via Power Purchase Agreements (PPAs) or power exchanges. They manage the physical infrastructure (substations, feeders, and service lines) to maintain voltage stability and reliability indices like SAIDI and SAIFI. The revenue is generated through retail tariffs regulated by the commission, balancing the cost of wholesale power procurement and infrastructure capital expenditure (CAPEX).

Key Formulas: $SAIDI = \frac{\sum (r_i 	imes N_i)}{N_T}$ — System Average Interruption Duration Index; $Revenue = \sum (Tariff 	imes Energy_{sold})$ — Basic Revenue model for DISCO

Key Points: DISCOs function as the interface between the transmission network and the end consumer.; Reliability management involves controlling voltage profile and fault clearing on feeders.; Deregulation separates DISCOs from Gencos and Transcos to create competitive markets.; They are responsible for meter reading, billing, and collection (MRBC).

Advantages: Local accountability for power quality; Tailored service for different consumer segments

Disadvantages: High Aggregate Technical and Commercial (AT&C) losses; Dependency on regulatory tariff approvals

Applications: Urban and rural grid electrification; Smart grid and AMI (Advanced Metering Infrastructure) deployment

Additional Info: Standard technical KPIs for DISCOs include SAIDI, SAIFI, and CAIDI metrics.. Option D is correct because all listed responsibilities constitute the legal and operational mandate of a typical distribution utility.

Answer: D is correct — The functions of a DISCO encompass the entire spectrum of electricity retail and local distribution network management.

Exam Tip: Always remember that in a deregulated power system, the DISCO acts as the 'Wires Company' (natural monopoly) and the 'Retailer' (competitive participant).

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Option A: Buy wholesale electricity through the spot markets through direct contracts with generation companies and supply electricity to the end user customer

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Option B: Constructs and maintain distribution wires connecting the transmission grid to the end-user customers

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Option C: Building and operating its electrical system to maintain a desired degree of reliability and availability

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