Blaming the wrong culprit
For much of the past decade, when conversations about India's wind energy sector turned to underperformance, the implicit explanation was the wind itself. Seasonal variability. Monsoon concentration. Lower-than-assessed resource quality. The gap between wind atlas projections and actual generation, year after year, was treated as a resource problem: a fundamental limitation of India's wind geography that made the sector inherently less attractive than the numbers had suggested.
That explanation is convenient. It is also largely wrong.
India's wind resource is real, substantial and in many locations genuinely world-class. The NIWE's wind potential assessment at 120 metres above ground level puts the commercially exploitable onshore potential at over 695 GW at a minimum 25% CUF. The states that host India's legacy wind fleet have wind resources that, properly harvested with modern turbines and professional operations, compare favourably with wind markets in Europe and the Americas.
The decade of underperformance was caused by a series of structural, commercial and policy failures that compounded each other over time, and that the industry is only now beginning to clearly diagnose and address.
The numbers that tell the story
India's national wind CUF has oscillated between 14% and 20% over the past decade: 14% in 2015-16, rising to around 20% in 2016-17, falling back to 16% in 2017-18 and averaging around 18% in recent years. Against a commercially exploitable potential estimated at 25% CUF and above, and against what modern turbines on good sites actually deliver, this is a significant and persistent gap.
Countries with comparable or weaker wind resources consistently deliver higher CUFs. India's low average CUF is a technology, siting, operations and policy story, not a resource story.
And the capacity addition numbers make the policy failure even clearer. From 2014 to 2022, India's solar capacity grew by over 2000% while wind grew by only 93%. A sector with 695 GW of exploitable potential, in a country adding renewable capacity at record pace, managed less than doubling of installed capacity in eight years. Something went systemically wrong.
The real reasons: a diagnostic
Reason 1: Small turbines on under-assessed sites
The first wave of Indian wind development, predominantly between 1995 and 2012, was characterised by turbines that were small by any modern standard, typically 250 kW to 1 MW per machine, installed on sites selected using wind resource assessments that were inadequate by contemporary standards.
Hub heights of 50-65 metres missed the stronger, more consistent winds at 100-120 metres that modern assessments target. Wind atlas data at the time lacked the spatial resolution to identify micro-siting variations that significantly affect individual turbine performance. The result was a fleet of small turbines on sites that were assessed as good but often turned out to be mediocre, delivering CUFs significantly below expectations.
Reason 2: The feed-in tariff to competitive bidding transition
The most consequential policy change in India's wind sector over the past decade was the shift from feed-in tariffs to competitive reverse auctions, which began around 2017.
Under feed-in tariffs, wind projects were allocated at state-determined tariffs of Rs 4-5 per unit, rates that provided the revenue certainty needed to finance projects and operate them professionally. The transition to competitive bidding drove tariffs to Rs 2.5-3 per unit. At these levels, many wind projects that had been financially viable under feed-in tariffs became marginal or unviable. The incentive to invest in quality O&M, condition monitoring and performance optimisation diminished.
The competitive bidding transition also changed the profile of wind developers in India. Under feed-in tariffs, wind development was accessible to a wide range of developers including smaller and more specialised operators. Under competitive auctions, scale became a prerequisite, reducing the diversity and pace of capacity addition.
Reason 3: Misaligned developer and operator incentives
A structural characteristic of India's wind sector that contributed significantly to underperformance was the separation between development and operations, and the misaligned incentives this created.
The dominant business model for wind development in India was developer-build-and-exit or developer-build-and-refinance. The developer's commercial event was at financial close and commissioning. O&M was contracted out to third parties on fixed-fee structures that minimised cost rather than maximised performance. The developer who built the plant was rarely the operator who ran it, and the operator who ran it had limited financial incentive to run it well.
Reason 4: Inadequate O&M investment and capability
The consequence of the misaligned incentives described above was systematic underinvestment in O&M capability across India's wind fleet.
Condition monitoring on legacy turbines was minimal. Predictive maintenance was largely absent. SCADA and monitoring systems were basic: data was collected but rarely analysed for performance insights. Spare parts availability for aging turbines was poor. Technician training and retention was chronically under-resourced.
The result was a fleet that degraded faster than it should have, suffered more unplanned downtime than necessary and generated significantly less than its resource potential across its operating life. The cumulative generation loss attributable to poor O&M across India's legacy wind fleet over the past decade, by any reasonable estimate, runs to tens of billions of units.
Reason 5: Regulatory and grid constraints
Grid curtailment of wind generation, where plants are asked to reduce output because the grid cannot absorb it, has been a recurring problem in high-penetration wind states, particularly Tamil Nadu. Banking and scheduling frameworks for wind generation have evolved slowly and inconsistently across states. Transmission infrastructure in wind-rich areas lagged behind generation capacity addition.
These regulatory and infrastructure constraints were not primarily responsible for the underperformance: the structural and operational issues described above were more fundamental. But they were a meaningful contributing factor.
Why this matters now
Understanding the real causes of India's wind underperformance is not an academic exercise. The sector is at an inflection point, and the decisions being made now about how to address the legacy fleet and how to structure the next wave of wind development will determine whether the next decade looks like the last one.
The structural causes of underperformance are addressable. Small turbines can be repowered with modern machines that deliver double or triple the generation from the same sites. Misaligned incentives can be corrected through output-based O&M contracting and longer developer accountability periods. Monitoring and O&M capability is improving as tools become more accessible and investor scrutiny increases.
Addressing these issues at scale requires capital, policy continuity and a willingness to confront the legacy of a decade of underinvestment honestly. Repowering requires navigating complex land, grid and regulatory approvals. Improving O&M on assets financed under thin margins requires commercial restructuring that not all stakeholders will find straightforward.
The wind sector's underperformance was not inevitable. It was the product of structural choices, in policy design, commercial structuring and operational investment, that can be made differently going forward. The resource was never the constraint. The question is whether the industry and its stakeholders have learned enough from the past decade to make better choices in the next one.
The wind is still there
India's wind resource has not changed. The sites that were identified as high-potential in the 1990s and 2000s remain high-potential today, often more so, because modern assessment methods and taller hub heights reveal wind resources that earlier studies missed.
What has changed is the industry's understanding of what it takes to harvest that resource reliably, efficiently and at commercially viable returns. That understanding, hard-won through a decade of underperformance, is the most valuable asset the Indian wind sector possesses as it enters its next phase.
The wind sector's best years are not behind it. They are ahead, for those willing to do the work of understanding what went wrong and building something better on the sites that remain.