MNRE Pushes Wind Energy Expansion in India’s Border Regions Amid Industry Concerns

The Ministry of New and Renewable Energy (MNRE) has confirmed that active inter-ministerial coordination is underway to facilitate the expansion of wind energy projects into India’s sensitive border regions. According to the MNRE Secretary, the ministry is engaged in high-level discussions with the Ministry of Defence (MoD) and the Ministry of Home Affairs (MHA). These talks are specifically focused on establishing a framework for the deployment of wind infrastructure in frontier zones where national energy targets intersect with national security imperatives.

Geographical Focus and Project Precedents

The India-Pakistan border has emerged as the primary geographical focus for this developmental push. The region has already served as a site for significant infrastructure precedents; specifically, a wind energy project was awarded to the Adani Group in this frontier zone. To facilitate this development, existing defence rules were relaxed, allowing the project to proceed within a restricted area. This instance provides a factual baseline for the relaxation of regulatory hurdles in high-security zones to accommodate renewable energy goals.

Regulatory Framework: NOCs and Security Clearances

The installation of energy infrastructure in border regions requires a stringent regulatory vetting process, necessitating “No Objection Certificates” (NOCs) from both the Ministry of Defence and the Ministry of Home Affairs. As India looks toward international benchmarks to resolve these domestic border frictions, the standards of Electromagnetic Compatibility (EMC) have moved to the forefront of the inter-ministerial dialogue.

As defined by technical expert Group Captain Maurice Dixon (RAF Retd) for WindEurope, EMC is the “ability of devices and systems to operate in their electromagnetic environment without impairing their functions.” In regulatory terms, wind turbines must achieve compatibility with military surveillance systems by avoiding “Electromagnetic Interference” (EMI) or “radio-frequency interference” (RFI), which are unwanted signals at the receiver that can degrade system performance.

Technical Security Risks: Radar Interference and Clutter

Technical assessments indicate that wind turbines pose multifaceted risks to military radar systems. These impacts on “Air Defence for Airspace Security” are categorized into four primary phenomena:

• False Plots and Ghost Targets: Turbines create indirect paths for radar signals, leading to the appearance of “ghosting” or false target positions on a display.
• Target Masking and Lost Tracks: An airborne target can be lost when its return is obscured by the “large RF and Doppler return” of a turbine. This masking occurs due to the turbine’s physical and electronic shadow, where the turbine’s signal return is significantly larger than that of the actual target.
• Track Seduction: There is a documented risk of turbines either initiating new radar tracks or “seducing” existing tracks, pulling them away from legitimate airborne targets.
• Radar Clutter: Turbines generate “unwanted signals, echoes, or images” on radar display tubes, categorized as clutter, which interferes with the observation of desired signals.

Industry and Operational Concerns

Beyond the immediate technical interference with radar, stakeholders have highlighted broader operational risks that affect both “Air Traffic Management for Airspace Safety” and “Aircrew Training.” These challenges include:

• Airspace Denial: The physical presence of wind farms can lead to a reduction in available operating and training airspace, directly impacting military flying maneuvers.
• Quick Reaction Alert (QRA) Challenges: Large-scale developments complicate the rapid detection, identification, and prosecution of unknown air targets, which is essential for the air defence of national airspace.
• Low-Level Flying Hazards: Turbines act as physical obstacles and generate turbulence, posing risks to low-level flying and parachute training.
• Surveillance Complexity: As turbines contribute more complex interference to an “ever noisier” radio-frequency (RF) spectrum, the surveillance challenge is heightened. This environment is likened to a “bigger and denser haystack” hiding “smaller needles.”
• Tactical Limitations: While the military can amend air combat tactics, doctrine, and plans to evolve with the clutter challenge, technical experts note these adjustments are effective “only to a point.”

Mitigation Status and Technical Roadmap

Current mitigations for air defence radar are not considered permanent solutions. In the United Kingdom, for example, the use of the TPS-77 air defence radar was employed to mitigate the impact of the Sheringham Shoal Wind Farm; however, such measures are characterized as “interim, partial and/or bespoke mitigations.”

To secure a more sustainable integration of renewable assets, the industry has proposed a “Radar and Wind Turbine Co-existence Roadmap.” This initiative advocates for “positively disruptive collaborative approaches” to define smart metrics for airspace safety and surveillance between 2020 and 2040. The roadmap serves as a technical and strategic guide to balancing wind energy expansion with the requirements of national energy security and military surveillance integrity.