Electricity: The backbone of an integrated energy system

Abstract

In an era defined by rapid technological change and an urgent need for cleaner energy, an integrated energy system, one that ties together generation, transmission, distribution and demand, is essential for meeting the world's growing energy needs. This paper argues that electricity is the backbone of such a system: it is the common medium through which renewable sources are absorbed, smart grids are coordinated, and decarbonization is delivered. It then makes a sharper, India-specific claim. India's challenge is no longer building enough clean generation, the country crossed 50% non-fossil installed capacity in 2025, five years ahead of its target (PIB, 2025). The weak links in the backbone are now the distribution utilities that remain financially stressed, and the missing storage layer needed to turn intermittent solar and wind into firm, round-the-clock power. Fixing the backbone therefore means fixing distribution and storage together, and the paper proposes one concrete mechanism to do so.

Introduction

As the world faces climate change, energy insecurity and the pressure to keep power affordable, a piecemeal approach to energy no longer works. An integrated energy system draws on diverse sources, modern technology and smart infrastructure to optimise how energy is generated, moved and consumed. At the heart of that system is electricity. Coal, gas, nuclear, hydro, solar and wind are all different at the point of generation, but they become interchangeable the moment they are converted into electrons on a shared grid. Electricity is the connective layer that lets these very different sources be planned, dispatched and balanced as one system. This paper first explains that role, then examines where India's backbone is actually breaking, and finally proposes a mechanism to strengthen it.

The role of electricity in renewable integration

The biggest technical challenge with renewables is intermittency. Solar and wind depend on the weather, so their output rises and falls through the day and the season. Electricity, and the grid that carries it, is what makes these variable sources usable: surplus solar generated at noon can be moved, stored and released to meet the evening peak, so long as the system is built to do it.

Two tools make this work. The first is the smart grid, a digitally enabled distribution network that senses load in real time, allows two-way communication between consumers and utilities, and shifts electricity to where and when it is needed. The second is energy storage, which time-shifts clean power from when it is generated to when it is demanded. Together they let an electrified system stay reliable even as its generation mix becomes more variable, which is the precondition for decarbonization: as transport, heating, cooking and industry electrify, cutting the carbon intensity of electricity cuts emissions across the whole economy at once.

India shows both the promise and the gap. Non-fossil sources now account for more than half of installed generating capacity (PIB, 2025), and coal's share of capacity has fallen below 50% for the first time since the 1960s (Deccan Herald/CEA, 2024). Yet coal still produces roughly 75% of the electricity India actually generates (IEA, 2024), because renewable capacity only generates when the sun shines and the wind blows. That gap between capacity and generation is exactly the gap that storage and smart grids are meant to close, and it is where India's real work now lies.

Where India's backbone is breaking

India has largely solved the generation-capacity problem it faced a decade ago. The remaining challenges sit downstream, in four connected areas.

1. Uneven distribution and access

Despite near-universal household connections, access is not the same as reliable, affordable, good-quality supply. Access is meaningful only when electricity is available in an adequate, reliable and affordable way, and when the utility meets basic standards of service. This is why the definition of "access" has moved beyond simply having a connection. The UN's Sustainable Development Goal 7 targets affordable, reliable, sustainable and modern energy for all by 2030 (UN SDG 7). To measure progress honestly, the World Bank's Multi-Tier Framework (MTF) grades access on capacity, availability, reliability, quality, affordability, legality and safety, from Tier 0 (no access) to Tier 5 (full access) (ESMAP). Under that lens, India's task is to lift millions of connections up the tiers, from "connected but unreliable" to genuinely dependable supply, which depends directly on the health of the distribution utilities discussed below.

2. The regulatory and policy framework

Electricity sits on the Constitution's Concurrent List, so both Parliament and state legislatures can legislate on it. The Electricity Act, 2003 governs generation, transmission, distribution and trading, and it opened the sector to competition: generation (except hydro) needs no licence, while transmission, distribution and trading remain licensed. Crucially, the Act allowed private participation alongside state-owned utilities.

The policy toolkit has since grown to force renewables to behave like firm power. The Round-The-Clock (RTC) Guidelines of 2020 let distribution companies procure 24×7 supply by bundling solar and wind with thermal power. But the framework's weakest point is financial: the state-owned distribution companies (DISCOMs) that actually sell power to consumers are still losing money, which is what undermines reliability and investment. Regulation has fixed the rules of the market; it has not yet fixed the balance sheet at the heart of it.

3. The energy-storage deficit

Storage is the single most important missing piece. India's peak demand keeps breaking records, it reached about 250 GW on 30 May 2024 (PIB, 2024) and has since crossed ~257 GW (Business Standard, 2026), and much of that peak falls in the evening, after solar generation has dropped off. Heat is the driver: April 2022 was the third-hottest April in 122 years, with the all-India average maximum reaching 35.30°C (IMD, 2022), and demand for cooling has climbed with population, incomes and urbanisation. Without storage, the evening peak has to be met by firing up coal and gas plants, which cancels out the emissions benefit of daytime solar.

The government has quantified the need. The National Electricity Plan (2023) projects a requirement of about 47.24 GW / 236 GWh of battery energy storage by 2031-32, needing roughly ₹3.49 lakh crore of investment (Govt of India, 2026). Support instruments are in place, Viability Gap Funding has been approved for 43.8 GWh, inter-state transmission charges are waived for co-located storage, and a Production-Linked Incentive scheme backs domestic cell manufacturing (MNRE). The pieces exist; what is missing is a hard obligation that forces storage to be built and used at the scale the numbers demand.

4. Efficient demand-side management

Demand-Side Management (DSM) is the cheapest capacity of all: every unit of peak demand avoided is a unit of generation, transmission and storage that never has to be built. DSM programmes encourage efficient end-use appliances and shift consumption away from peak hours, lowering both consumers' bills and utilities' costly peak-power purchases. India has the mechanism for this in the Time-of-Day (ToD) tariff, introduced through the Electricity (Rights of Consumers) Amendment Rules, 2023: peak-hour tariffs of at least 1.2× the normal rate for large commercial and industrial users, and solar-hour tariffs at least 20% below normal (MoP, 2023). Used well, and paired with the smart meters being rolled out under the distribution scheme below, ToD tariffs can move flexible load into the sunny middle of the day and flatten the evening peak, shrinking the very storage gap described above.

A concrete proposal: couple the DISCOM bailout to storage and demand-shifting

India already has the right instruments, RDSS money, an Energy Storage Obligation, Time-of-Day tariffs and smart meters, but it runs them as separate programmes. The central argument of this paper is that they should be run as one lever. Because the backbone's weak links are distribution finance and storage, the highest-leverage reform is to tie the money DISCOMs already receive to the storage and demand-shifting they are failing to deliver.

The recommendation is a storage-firmed supply compact, built entirely from existing tools:

1. Attach a storage floor to distribution-support money. The Revamped Distribution Sector Scheme (RDSS), successor to UDAY, carries a ₹3,03,758-crore outlay and aims to cut AT&C (Aggregate Technical & Commercial) losses to 12 to 15% (MoP). Those losses actually rose to 16.12% in 2023-24, from 15.11% a year earlier (PFC, 2025), so the money is not yet buying the result. Make each future RDSS disbursement conditional on the DISCOM contracting a rising share of its evening-peak energy from storage-backed renewables, escalating annually. This hardens the government's own Energy Storage Obligation, which already targets a rise from 1% to 4% by 2029-30 (MoP, 2023), by making it a condition of receiving central funds rather than a soft target.
2. Pay for the storage with instruments already on the table, the 43.8 GWh of approved Viability Gap Funding and the inter-state transmission-charge waiver (MNRE), so that firming the grid does not spike consumer tariffs.
3. Widen and enforce the Time-of-Day tariff (peak ≥1.2×, solar hours ≤0.8×) using the smart meters RDSS is funding, so consumers themselves shift load into solar hours. Every kilowatt of peak that demand-shifting removes is a kilowatt of storage that never has to be procured, which makes the storage floor in step 1 cheaper to hit.

The proposal is deliberately falsifiable. If, after this coupling, AT&C losses keep rising and the evening-peak deficit is still met by thermal plants, the claim that distribution-plus-storage is the binding constraint would be wrong. But the logic holds: pouring capital into DISCOMs without demanding firm clean power, and mandating storage without fixing the utilities meant to buy it, are the two halves of the same failure. Joining them is the reform.

Conclusion

Electricity is the backbone of an integrated energy system because it is the shared medium that lets diverse sources, smart grids and decarbonizing sectors work as one. For India, the encouraging news is that the generation half of that backbone is now strong, non-fossil capacity has passed 50% ahead of schedule. The honest news is that the backbone's strength is being lost downstream, in loss-making distribution utilities and an under-built storage layer, so that clean daytime power still gives way to coal at the evening peak.

The way forward is not another standalone scheme but the coupling of the ones India already has: tie distribution-support money to a storage-backed peak-supply obligation, fund the storage through existing viability-gap support, and let Time-of-Day tariffs flatten demand. Done together, these steps turn electricity from a backbone that merely carries power into one that carries a cleaner, more reliable and more affordable energy system, the outcome an integrated energy system is meant to deliver.

Sources

1. India crossed 50% non-fossil installed capacity in 2025, five years ahead of the 2030 NDC target; 500 GW non-fossil goal by 2030.
2. Coal's share of India's electricity generation is ~75%, far above its capacity share (supports the "generation vs. capacity" argument).
3. CEA projection of coal's capacity/generation trajectory.
4. Coal's share of installed capacity fell below 50% for the first time since the 1960s.
5. PFC report: pan-India AT&C losses 16.12% in 2023-24, up from 15.11% in 2022-23.
6. Corroborates DISCOM AT&C-loss and collection-efficiency figures.
7. Revamped Distribution Sector Scheme (RDSS): ₹3,03,758 crore outlay, target to cut AT&C losses to 12 to 15% and ACS-ARR gap to zero.
8. Govt (Rajya Sabha): BESS need of 47.24 GW / 236 GWh by 2031-32; ~₹3.49 lakh crore (BESS) / ₹4.78 lakh crore (total ESS); VGF for 43.8 GWh.
9. MNRE energy-storage policy support (VGF, ISTS waiver, PLI for cell manufacturing).
10. Energy Storage Obligation trajectory: 1% (FY24) rising to 4% by FY30, ≥85% of stored energy from renewables.
11. Time-of-Day tariff (Electricity Rights of Consumers Amendment Rules, 2023): peak ≥1.2× normal for large C&I; solar-hour tariff ≥20% below normal.
12. India met a record peak demand of ~250 GW on 30 May 2024.
13. Subsequent record peak of ~257 GW (May 2026).
14. IMD: April 2022 was the third-hottest April in 122 years nationally (all-India avg max 35.30°C).
15. World Bank ESMAP Multi-Tier Framework for measuring energy access.
16. UN Sustainable Development Goal 7 (affordable, reliable, sustainable, modern energy for all by 2030).
17. IEA India Energy Outlook (retained from the original, verified).