What if fossil fuels were banned for power generation? [32]

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Summary of the Article:

A blanket ban on fossil fuels in power generation—implemented over a defined glide path—would fundamentally reshape power systems: (1) resource mix shifts to a portfolio of renewables, nuclear, hydro, and (where viable) geothermal and bioenergy, backed by long‑duration storage, grid expansion, and flexible demand; (2) reliability planning moves from peak‑capacity adequacy to multi‑day/seasonal energy adequacy; (3) costs rise in the near term due to accelerated investment in storage and networks but fall over time as learning curves and avoided fuel/volatility benefits accrue; (4) trade flows and industrial competitiveness change as carbon‑intensive electricity is displaced, consistent with IPCC pathways that show near‑zero power is prerequisite for economy‑wide decarbonization. In India, success requires: fast‑tracking pumped storage hydropower (PSH) and BESS already foreseen in the National Electricity Plan; scaling round‑the‑clock (RTC) renewable procurement; and building inter‑state transmission, all while managing just transition for coal regions. [energy-cities.eu] [interestin...eering.com], [baldwinemc.com]

1) Context: why a ban is systemically different from “net‑zero pathways”

Most decarbonization scenarios gradually shrink unabated fossil generation while adding clean capacity and, in some cases, carbon capture. A ban removes fossil dispatch entirely, accelerating the need for firm, clean supply and deep flexibility. The IPCC’s energy‑systems assessment shows that power must reach net‑zero globally by mid‑century under well‑below‑2 °C pathways, with coal without CCS falling 67–82% by 2030 and low‑carbon sources providing >90% of global electricity by 2050—a ban simply pulls those endpoints forward and eliminates residual unabated fossil as a contingency. [energy-cities.eu]

Implications:

  • Seasonality & multi‑day deficits must be managed without gas peakers or coal back‑up; that pushes systems toward long‑duration storage (LDES), hydro/PSH, nuclear, and demand flexibility. (LDES is codified in planning guidance in multiple jurisdictions.) [Huntorf CA...Operation]
  • Fuel risk and exposure to commodity price swings reduce materially, a benefit highlighted in IEA market outlooks as coal/gas price volatility has been a major driver of wholesale price spikes. [wren.uk.com]

2) System architecture without fossil generation

A) Supply stack

  • Variable renewables (VRE): solar and wind become the energy backbone, sized to meet annual energy plus storage charging needs, acknowledging curtailment as a design feature rather than failure. IPCC scenarios show electrification and clean supply as the central levers for economy‑wide mitigation. [energy-cities.eu]
  • Firm low‑carbon generation:
    • Hydro/PSH provides dispatchable energy and inertia;
    • Nuclear delivers 24×7 baseload and ancillary services;
    • Geothermal and sustainable bioenergy where resources exist;
    • Clean hydrogen‑to‑power may emerge for rare seasonal deficits, subject to economics and infrastructure readiness flagged by IEA/World Bank. [entsoe.eu]

B) Flexibility portfolio

  • Short‑duration storage (1–8 h): BESS to manage intraday ramps (duck curve), reserves, and fast frequency response—already supported by India’s VGF framework. [research-h...b.nrel.gov]
  • Long‑duration storage (8 h–multi‑day): PSH and emerging LDES to shift energy across days/weeks and reduce VRE overbuild. Policy groups recommend resource‑adequacy metrics that credit duration, not just MW. [interestin...eering.com], [Huntorf CA...Operation]
  • Demand flexibility: price‑based demand response, time‑of‑day tariffs, and industrial load control; such measures reduce required storage and overbuild under a ban scenario (consistent with IPCC emphasis on end‑use electrification with flexibility). [energy-cities.eu]
  • Transmission: large inter‑regional transfers reduce variability and firming needs; IEA’s WEO and coal market assessments underscore the system value of diversified portfolios and networks to manage shocks and variability. [entsoe.eu], [wren.uk.com]

3) Reliability and adequacy without fossil back‑up

Conventional capacity accreditation overvalues thermal nameplate. Planners need energy‑limited reliability metrics and hourly/seasonal loss‑of‑load expectation (LOLE) with explicit weather‑correlated VRE and storage state‑of‑charge constraints. Global policy analyses urge resource adequacy reforms that weight year‑round energy adequacy and multi‑day resilience, which becomes mission‑critical in a fossil‑free stack. IPCC pathways similarly stress that power decarbonization requires both supply diversification and flexibility scale‑up to sustain reliability as fossil exits. [Huntorf CA...Operation] [energy-cities.eu]

4) Economics: capex up‑front, opex down the road

Total cost dynamics. In the near term, systems face a capex surge for VRE, storage, nuclear/hydro refurbishments, and grids; over time, fuel costs fall to near‑zero and exposure to commodity price spikes declines—a shift noted in IEA market reviews of coal and broader WEO analyses. IPCC indicates that deep power decarbonization is a cornerstone of least‑cost economy‑wide mitigation because clean power unlocks cheap decarbonization in transport and buildings via electrification. [wren.uk.com], [entsoe.eu] [energy-cities.eu]

Who pays? Tariff impacts depend on policy design: (i) well‑structured capacity/adequacy payments for LDES and PSH, (ii) ancillary‑service markets monetizing fast frequency and inertia, and (iii) transmission tariffs that reflect geographic diversification benefits. Jurisdictions are increasingly moving in this direction, with tenders for RTC/FDRE products bundling renewables and storage (e.g., India’s SECI auctions). [baldwinemc.com]

5) India: what a fossil‑free power ban would require (2026–2035)

A) Start from today’s base and stated plans

  • India’s electricity remains majority fossil‑based (coal >70% of generation recently), but clean capacity additions hit records in 2025 and coal generation declined year‑on‑year—rare outside the pandemic shock—indicating momentum for a pivot. [solaredition.com], [rsm-studio.com]
  • The National Electricity Plan (NEP 2023) projects ~411 GWh storage by 2031–32 (≈47 GWh PSH, 236 GWh BESS, plus others), aligning with a high‑RE future—exactly the flexibility scale you need if fossil is legislated out. [interestin...eering.com]
  • India is already procuring round‑the‑clock renewable power with delivery‑fulfilment ratios and penalties, compelling developers to integrate storage and/or PSH. Winning tariffs in 2025 landed around ₹5.06–5.08/kWh for RTC blocks, demonstrating market appetite. [baldwinemc.com]

B) A fossil‑free stack for India—credible building blocks

  1. Mass solar + wind buildout across resource corridors (Rajasthan, Gujarat, Tamil Nadu, Karnataka, AP) sized at >1.2–1.5× annual demand to cover storage charging and seasonal variability. IPCC and IEA analyses support the centrality of VRE scale‑up for decarbonized power. [energy-cities.eu], [entsoe.eu]
  2. PSH as the deep‑energy anchor: India’s PSH pipeline is large and advancing; CEA and PIB note multiple DPR concurrences and a push for off‑stream, closed‑loop sites with faster clearances—precisely the configuration to supply multi‑hour/weekly shifting. [hydrostor.ca]
  3. BESS for intraday flexibility: The 4,000 MWh Viability Gap Funding scheme (recently upsized administratively as costs fell) brings near‑term BESS to market with a target LCOS of ₹5.5–6.6/kWh, enabling RTC structures to scale without fossil. [research-h...b.nrel.gov]
  4. Hydro, nuclear, and biomass as firm complements: India’s existing hydro fleet and nuclear units deliver inertia and baseload; targeted life‑extension and uprates reduce reliance on storage during monsoon deficits and evening peaks. (IEA WEO and IPCC stress the value of diversified firm low‑carbon.) [entsoe.eu], [energy-cities.eu]
  5. Transmission & markets: Expand ISTS corridors and speed GNA/open access. RTC contracts should allow multi‑node delivery (western solar + southern wind) to harvest diversity, a best practice embedded in recent RTC designs. [baldwinemc.com]

C) Phased approach (illustrative)

Phase 1: 2026–2028 – “Firm clean foundations”

  • Commission 8–10 GW/year PSH (nameplate) and 10–15 GWh/year BESS via sequenced tenders using the VGF window and 15–20‑year adequacy contracts. (NEP’s cumulative 2032 storage target becomes a 2029 milestone under a ban.) [interestin...eering.com]
  • Lift RTC procurement to 10–15 GW/year, require minimum duration (e.g., 6–8 h) and DFR ≥ 80% monthly with penalties (as in SECI’s terms) to build operational discipline. [baldwinemc.com]
  • Prioritize inter‑regional lines to move peak‑surplus between west, south, and north, reducing storage requirements through geographic smoothing (an IEA‑consistent reliability strategy). [entsoe.eu]

Phase 2: 2028–2031 – “Fossil‑free hours”

  • Mandate fossil‑free operation in off‑peak time blocks first (e.g., 10:00–16:00, then 23:00–06:00), forcing optimal use of BESS/PSH and nuclear/hydro. Expand ancillary markets so storage monetizes frequency, inertia and black‑start. [research-h...b.nrel.gov]
  • Align industrial demand with solar‑rich daytime via ToD tariffs and green open‑access; IPCC highlights electrification + demand flexibility as central to deep decarbonization. [energy-cities.eu]

Phase 3: 2031–2035 – “Full ban compliance”

  • Retire or repurpose remaining coal units to synchronous condensers or seasonal reserve (non‑generating role), finalize firm clean capacity (PSH/nuclear/hydro uprates), and enforce zero‑fossil dispatch with exceptions only for national emergencies under predefined reliability standards. (IEA/coal market analysis underscores benefits of exiting fuel‑price volatility.) [wren.uk.com]

D) Managing transition risks

  • Reliability: Adopt energy‑adequacy accreditation and seasonal LOLE to size storage correctly; move from MW to MWh‑crediting for procurement—guidance consistent with LDES policy recommendations. [Huntorf CA...Operation]
  • Tariffs: Blend capex support (e.g., VGF) with tapered adequacy payments; leverage RTC competition (as in SECI rounds) to contain prices while guaranteeing availability. [baldwinemc.com]
  • Regional equity: Use part of savings from avoided coal imports/fuel volatility and incremental clean‑power revenues to fund just transition packages in coal states—redeployment into PSH construction, transmission EPC, and battery parks. (Macro logic aligned with IEA’s volatility narrative and IPCC’s emphasis on socio‑economic co‑benefits.) [wren.uk.com], [energy-cities.eu]

6) Common objections—and pragmatic answers

“Won’t we face blackouts without coal and gas?”
Not if reliability is redefined around energy duration, portfolios include PSH/BESS + firm clean, and inter‑regional transmission is in place. Resource‑adequacy reforms that credit duration and availability across seasons are key; multiple policy groups now recommend this shift. [Huntorf CA...Operation]

“Isn’t this too expensive?”
Up‑front capex is large, but fuel savings and reduced volatility offset opex; RTC tenders in India already reveal market‑viable all‑in prices with storage obligations (₹5.06–5.08/kWh), and storage LCOS is trending down under the BESS VGF. [baldwinemc.com], [research-h...b.nrel.gov]

“What about seasonal monsoon deficits and evening peaks?”
PSH provides multi‑hour/weekly energy shifting; BESS flattens peaks; nuclear/hydro anchor baseload; overbuild + curtailment plus demand response fills residual gaps—this stack is consistent with IPCC’s no/low‑fossil electricity pathways. [energy-cities.eu]

7) Board‑level checklist (next 12–18 months)

  1. Set fossil‑free milestones by time block (e.g., “daytime zero‑fossil by 2029”) to de‑risk a hard ban date. [energy-cities.eu]
  2. Commit multi‑GW RTC procurements with firm duration and DFR metrics; run PSH and BESS tenders in parallel using the existing VGF/CEA frameworks. [baldwinemc.com], [research-h...b.nrel.gov], [hydrostor.ca]
  3. Codify energy‑adequacy accreditation (MWh‑based), seasonal LOLE, and ancillary markets for inertia and fast frequency. [Huntorf CA...Operation]
  4. Accelerate ISTS build‑out to stitch solar‑rich west with wind‑rich south and load centres in the north/east (IEA WEO planning principle). [entsoe.eu]
  5. Publish a just‑transition plan for coal regions—retraining and capex pipelines tied to PSH sites, transmission EPC, battery manufacturing. (Macro rationale: fuel‑volatility savings redeployed domestically.) [wren.uk.com]

Bottom line

A ban on fossil fuels in power generation is ambitious but system‑designable. The technical playbook is clear—VRE overbuild, PSH/BESS scale‑up, firm low‑carbon anchors, demand flexibility, and big wires—and India already has many building blocks in motion (NEP storage targets, RTC tenders, PSH pipeline, BESS VGF). The decisive steps now are procurement at scale, adequacy reform, and transmission acceleration—turning a policy aspiration into a reliable, affordable, fossil‑free grid. [interestin...eering.com], [baldwinemc.com], [research-h...b.nrel.gov]

Endnotes & references (selected)

  • IPCC, AR6 WGIII—Energy Systems: decarbonized power, coal without CCS down 67–82% by 2030, low‑carbon electricity >90% by 2050, electrification and flexibility central to pathways. [energy-cities.eu]
  • IEA World Energy Outlook (2023): system value of diversified clean portfolios, networks, and resilience to commodity shocks. [entsoe.eu]
  • IEA Coal 2024/2025: price/volatility context and implications of accelerated coal exit. [fsr.eui.eu], [wren.uk.com]
  • Resource adequacy & LDES policy: call to pivot from peak MW to year‑round energy adequacy and duration‑based crediting. [Huntorf CA...Operation]
  • India planning and procurement:

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