India’s electrical energy demand is hovering, pushed by financial progress and upcoming drivers for demand, together with from cooling, trade, inexperienced hydrogen, and mobility (electrical autos). The federal government’s plan to put in 500 GW of non-fossil capability by 2030 is formidable, however is that this “sufficient”?
Let’s think about solely assembly rising demand with new renewable vitality (RE, and even non-fossil, which provides new hydro and nuclear provide) — if we don’t have sufficient, then we want extra fossil gasoline output, primarily coal. As we dig deeper via a brand new CSEP examine, we discover that not solely is the ambition inadequate to satisfy incremental demand via 2030 on common, however the state of affairs is much more difficult for these RE targets after we think about their time-of-day output, variability and uncertainty, and grid stability.
Balancing the electrical energy grid is likely one of the most advanced duties mankind has achieved, primarily as a result of it depends on real-time balancing demand and provide (web of system losses). The previous calculation began with demand after which constructed out sufficient capability to satisfy stated demand always, together with a predictable buffer. However with the rise of wind and photo voltaic, mainstays of India’s decarbonisation ambitions, even provide is extremely variable.
If we begin with the vitality necessities (kilowatt-hours, or kWh), nobody is aware of exactly how a lot output a one MW wind turbine or photo voltaic plant will give, not to mention when it’s going to accomplish that. We solely know photo voltaic largely follows a bell curve of output, and wind is comparatively seasonal. Even these rely on a spread of variables we examine, together with location and using rooftop photo voltaic. We even have monumental uncertainty on the form of the demand curve. Whereas mid-day demand is rising, which is sweet for aligning with photo voltaic provide, we nonetheless have enormous demand progress within the night, and this can solely worsen with extra air-con hundreds.
Even underneath optimistic eventualities the place all deliberate RE tasks full on time — a big assumption given historic delays — our examine reveals that by 2030, renewable progress is prone to fall quick by nearly 12% when it comes to assembly incremental whole annual vitality.
The problem turns into much more acute when contemplating the mismatch between provide and demand throughout particular occasions of the day or yr, which we studied utilizing precise historic knowledge throughout a number of years. Even when we sized wind and photo voltaic to supply sufficient energy yearly, nearly all of time intervals would both have giant deficits or surpluses.
An apparent resolution to renewable variability and to bridge deficit intervals with surplus is vitality storage, like batteries or pumped hydro. Nevertheless, storage techniques face effectivity losses (10–25%) and seasonal mismatches. Even when we oversize to beat such losses, an financial penalty, our examine highlights a serious unanswered query — how will we cost the batteries?
Whereas RE surpluses are invariably in the course of the day, as we quantify, they range enormously by season. The day you want the battery essentially the most, there may be little RE surplus inside that earlier day. Counting on daily-use storage might have important overbuilding of renewable capability, which is pricey.
Addressing these challenges requires a spread of coverage and planning upgrades.
First, we’ve to give attention to the general portfolio, as an alternative of a slim silo method. India’s renewable plans are closely skewed towards photo voltaic, which seems cheaper on common, however photo voltaic may be very coincident in output, to the purpose it’s going to quickly change into surplus mid-day. Wind could seem dearer on common than photo voltaic (foundation its LCOE, or levelised price of vitality), however it gives output extra occasions of the day (it’s sadly additionally extra seasonal). A extra balanced solar-to-wind combine may mitigate surpluses and deficits however scaling up wind energy faces challenges equivalent to land constraints and regional disparities. Moreover, the rising share of rooftop photo voltaic within the whole photo voltaic capability reduces the general nationwide photo voltaic output as a result of inherently decrease capability utilisation issue of rooftop photo voltaic.
Portfolio planning should additionally consider uncertainty, threat, resilience, and higher coverage selections (like subsidies/free energy, which skew producer and shopper incentives). All these want much more clear assumptions and granular knowledge, a limitation in the present day.
Second, we’ve to give attention to scale, not simply capability but in addition the precise sort. Doubling the tempo of renewable installations is essential, with an emphasis on high-quality tasks that ship higher capability utilisation. Furthermore, grid planning should incorporate hourly and seasonal variability moderately than relying solely on annual averages, particularly as new demand sources like electrical autos (EVs) and inexperienced hydrogen emerge. And whereas India urgently wants storage, these aren’t but almost low-cost sufficient to “finish coal”. Any storage wants clear plans for the way it will cost — storage ought to complement renewables, not proceed the dependence on fossil fuels.
Lastly, we’ve to sign costs and worth accurately. Electrical energy pricing ought to replicate time-of-day prices, encouraging industries and customers to shift demand to intervals when renewables are plentiful. Demand response programmes, powered by sensible grids and know-how, might help dynamically align demand with RE provide. We don’t simply wish to save vitality however reserve it on the proper time. Importantly, this isn’t only a provide drawback.
India’s vitality transition stands at a essential juncture. The 2030 targets are nonetheless simpler than future wants when the share of RE might be larger and there might be extra stress on avoiding coal. Failing to handle these challenges dangers growing India’s dependence on coal, undermining decarbonisation objectives. Even with deliberate hydro and nuclear additions, fossil fuels will fill the hole left by renewables. Whereas this can be prudent economically and grid-security-wise, there may be an apparent environmental trade-off. The excellent news is clean-tech prices proceed to fall. We must be able to innovate, adapt and speed up.
Rahul Tongia is senior fellow and Rohit Vijay is analysis affiliate, on the Centre for Social and Financial Progress (CSEP), a New Delhi-based not-for-profit assume tank. The views expressed are private
