Power Bills Set to Dip as Government Eases Emission Norms for Thermal Plants

The Indian government has relaxed sulphur emission norms for coal-fired power plants, aiming to lower electricity costs while maintaining environmental standards. The new rules exempt many plants from mandatory Flue Gas Desulphurisation systems, focusing on location-specific regulations.

In a move aimed at balancing environmental goals with economic realities, the central government has relaxed the sulphur emission norms for coal-fired power plants — a step expected to reduce electricity costs by 25 to 30 paise per unit, according to senior officials.

The revised rules, notified via Gazette, limit the earlier mandate of installing Flue Gas Desulphurisation (FGD) systems — which control sulphur dioxide (SO₂) emissions — only to thermal plants located within a 10 km radius of cities with populations over one million. Power plants located in critically polluted areas or non-attainment cities will be considered on a case-by-case basis, while nearly 79% of India’s coal power capacity — mostly in less densely populated or rural areas — will now be exempt from mandatory FGD installation.

The decision follows several independent studies and recommendations by bodies like IIT Delhi, CSIR-NEERI, and the National Institute of Advanced Studies (NIAS). Their findings showed that SO₂ levels in most parts of India remain well within permissible limits, largely due to the low sulphur content of Indian coal and the high smokestack designs that allow for effective dispersion. As per government data, sulphur dioxide levels in multiple cities were recorded between 3 to 20 micrograms per cubic meter, well below the national standard of 80 micrograms.

The Central Pollution Control Board (CPCB) also noted that retrofitting all thermal units with FGDs would inadvertently increase carbon dioxide (CO₂) emissions, due to added limestone mining, transport, and energy use. In fact, the NIAS study estimated that a nationwide FGD rollout would generate 69 million tonnes of CO₂ between 2025 and 2030 — defeating the purpose of reducing environmental harm.

The relaxed norms are expected to ease financial pressure on power producers. Earlier, the estimated cost of mandatory retrofitting was pegged at over Rs 2.5 lakh crore — or Rs 1.2 crore per megawatt (MW) — with downtime of up to 45 days per unit. Officials say the current policy shift will not only help keep electricity affordable but also improve grid reliability, especially during peak demand seasons.

Power sector leaders have welcomed the decision. "This is a science-driven, rational policy that prioritizes emissions control where it matters most," said a senior executive of a major state-run utility. "And ultimately, it protects the consumer’s wallet." State electricity boards (discoms) are expected to benefit too, with lower input costs helping contain tariffs and reduce the government’s subsidy burden.

Not a Rollback, But a Recalibration

Government sources stressed that the new approach isn’t a dilution of environmental commitment. "This is a targeted and evidence-based adjustment," a senior official said. "We remain fully committed to clean air and climate goals — but with smarter, location-specific regulation. An official affidavit incorporating these findings will soon be submitted to the Supreme Court, which is currently reviewing the timeline for FGD enforcement in the MC Mehta vs Union of India case.