The grid: how power reaches a plug, who regulates it, and what renewables change

Prelims and MainsCurrent affairs on this: Grid, power sector and energy policy

Electricity is made at a plant, carried at high voltage by transmission lines, delivered by a distribution company and paid for by a consumer, and the Electricity Act, 2003 gave each stage its rules: generation needs no licence, transmission and distribution do, and a large consumer may buy from whom it likes through open access. India has run as one synchronised grid at 50 hertz since the southern region joined in 2013, operated by the Grid Controller of India through its load despatch centres and regulated by the Central Electricity Regulatory Commission and its State counterparts. About half of installed capacity is now non fossil, and the grid's problems have changed with it: solar and wind arrive when the weather allows rather than when demand asks, give none of a spinning turbine's inertia, and need lines, storage and a market that pays for flexibility.

• The chain and its institutions, in the figure: the Central Electricity Authority plans; generators, public and private, sell under long term agreements or on the exchanges; the Power Grid Corporation builds and owns most inter State lines, at 765 and 400 kilovolts and by high voltage direct current where distance or asynchronous links demand it; the Grid Controller of India balances supply and demand minute by minute; distribution companies, most owned by States, deliver and bill; three power exchanges, on their own subject, trade the short term.
• The regulators: the Central Electricity Regulatory Commission for inter State matters and tariffs of central generators, State commissions for retail tariffs and distribution, the Appellate Tribunal for Electricity above both, and the Bureau of Energy Efficiency under the Energy Conservation Act, 2001 for the demand side, with its star labels, building codes and the Perform, Achieve and Trade scheme for industry. The Energy Conservation (Amendment) Act, 2022 added a carbon credit market and turned the renewable purchase obligation into a consumption obligation on large users.
• What renewables change: variability, since demand peaks after sunset and solar at noon, answered by storage, hybrids and time of day tariffs that make daytime power cheaper; inertia, on the inverter subject, answered by grid forming inverters and synchronous condensers; curtailment, on its own subject, when lines or load cannot take the power; and transmission, the Green Energy Corridor on its own subject, since the sun and wind are in Rajasthan, Gujarat and Tamil Nadu and the load is elsewhere.
• The distribution companies: aggregate technical and commercial losses of about 15 per cent, the sum of theft, billing failure and line loss; tariffs below cost for farms and homes, met by State subsidy and by industry paying more; and the reforms, the Ujwal DISCOM Assurance Yojana of 2015 that moved debt to States, the Revamped Distribution Sector Scheme of 2021 that pays for smart prepaid meters and loss reduction, and the Late Payment Surcharge Rules of 2022 that cut supply to a company that does not pay its generators.
• The measures a question uses: installed capacity in gigawatts against peak demand, which passed 270 gigawatts in May 2026, against generation in units, where coal still supplies about three quarters; the frequency band the grid must hold, close to 50 hertz; per capita consumption of about 1,400 units a year, a third of the world's; and the pending Electricity (Amendment) Bill, which would let more than one distribution company serve an area.

Mains: The grid's bottleneck has moved from generating enough to moving and paying for it: the plants are built and half of them are clean, but the lines lag, the distribution companies lose money on every unit sold below cost, and a market that rewards a plant for being available at seven in the evening is what the next decade has to build.

Further reading: The Electricity (Amendment) Bill, 2022 (PRS India)

See also: India's renewable capacity · Curtailment · Inverter based resources · Green Energy Corridor · Power exchanges and market coupling · Renewable projects near the international border · Solar: the cell, the chain and the schemes · How a battery works, and the chemistries in play · India's carbon market: the Carbon Credit Trading Scheme