Tools / Power Line Proximity

Power Line Proximity Check for Any Plot in India

Is this plot within the safety clearance zone of a high-tension line or electrical substation? Voltage classification, CEA setback status, and grid connectivity signal — for any location in India.

Why power line proximity is a dual signal

A high-tension line near your plot can mean two opposite things: good grid connectivity, or a safety clearance restriction on construction. This tool reports both.

The concern side: safety clearance and Right of Way

Every high-tension power line in India carries a statutory safety clearance zone defined under the CEA (Measures Relating to Safety and Electric Supply) Regulations 2010. Within this zone, permanent construction is restricted. The clearance varies by voltage — from 5 m for low-voltage 11 kV distribution lines to 30 m for 400 kV inter-state transmission lines. For plots that fall within this zone, any construction requires prior clearance from the local DISCOM or transmission utility.

Beyond the safety clearance, transmission companies (particularly POWERGRID for national grid lines) hold a statutory Right of Way (RoW) corridor. The RoW is typically wider than the safety clearance distance. No permanent structure is permitted within the RoW. The RoW boundary is not always clearly demarcated on the ground, and many buyers discover the restriction only at the building plan approval stage.

The opportunity side: grid connectivity

A plot adjacent to or near a high-tension line has a significant advantage for power-intensive uses. Industrial facilities, cold chains, data centres, EV charging hubs, and commercial complexes that require dedicated HT connections benefit from proximity to existing infrastructure — it reduces both the capital cost of the grid connection (shorter line length) and the time to energisation. In rural and peri-urban India, the presence of a 33 kV or 66 kV line within 1–2 km of a plot often determines whether power can be connected within months or years.

Substations: the strongest grid signal

An electrical substation within 2 km is the clearest indicator of grid infrastructure maturity. Substations are where voltage is stepped down for distribution. A nearby substation means: reliable grid connection available, shorter distribution cable run, lower voltage drop, and typically faster sanction for new connections. For industrial and commercial land acquisition, substation proximity is a due-diligence checklist item — not just a nice-to-have.

What the result card shows

Four signals plus a map of all HT infrastructure within range, colour-coded by voltage.

Nearest HT line

Distance in metres to the closest high-tension line of any voltage level. Below the CEA clearance threshold for that voltage, a restriction flag is raised.

Note: Distance is measured to the nearest point on the line geometry — not to the nearest tower, which can be farther away.

Voltage classification

The voltage level of the nearest line — 11 kV, 33 kV, 66 kV, 132 kV, 220 kV, or 400 kV. Higher voltage means wider clearance zone but also stronger grid infrastructure signal.

Example: A 400 kV POWERGRID inter-state line has a 30 m clearance and a 52 m RoW. A 33 kV urban distribution feeder has a 10 m clearance.

Clearance zone status

Whether the plot falls within the CEA-mandated safety clearance zone for the nearest line’s voltage level. Inside the zone: construction restricted, DISCOM approval required. Outside: no standard restriction.

Important: The clearance zone check uses the OSM-tagged voltage. If the actual voltage is different, the clearance zone boundary changes. Verify voltage with DISCOM before acting.

Nearest substation

Distance to the nearest electrical substation of any type — transmission (220/400 kV), sub-transmission (66/132 kV), or distribution (33/11 kV). A substation within 2 km is a strong grid-readiness signal.

Best for: Industrial, commercial, data centre, and EV infrastructure siting — where grid connection cost and speed are critical inputs.

HT line setback distances — CEA Safety Regulations 2010

Minimum horizontal clearance from the outer conductor of the nearest HT line. Exact distances are governed by CEA Safety Regulations 2010 and state utility policies — verify with your DISCOM before construction.

Voltage level	Min. safety clearance	Typical RoW width	Grid function
400 kV	30 m	52 m (26 m each side)	Inter-state transmission (POWERGRID)
220 kV	20 m	35 m (17.5 m each side)	State transmission grid
132 kV	15 m	27 m (13.5 m each side)	Regional sub-transmission
66 kV	12 m	26 m (13 m each side)	District distribution
33 kV	10 m	15 m (7.5 m each side)	Urban feeder distribution
11 kV	5 m	Not always notified	Local last-mile distribution

Source: CEA (Measures Relating to Safety and Electric Supply) Regulations 2010. RoW widths are typical values from POWERGRID and state transmission utility guidelines — not a legal document. Verify with your state electricity board before any construction.

How the analysis works

One PostGIS query. No external API. All power infrastructure pre-loaded — results in under 200 ms.

You mark the site

Draw the plot boundary, drop a pin, or type an address. We extract the centroid and run a spatial query against all mapped HT lines and substations within 10 km.

We find the nearest line and substation

HT lines are stored as line geometries in PostGIS. Distance is measured to the nearest point on the line — not to the nearest tower. The voltage tag determines which CEA clearance threshold applies, and we compare your distance against it to set the clearance zone flag.

You see a voltage-coded map and four signals

All HT lines within range are rendered on the map colour-coded by voltage level. Substations are shown as square markers. The result card shows clearance zone status, voltage, and grid connectivity signal alongside the map.

Methodology and data sources

All data pre-loaded in PostGIS. No external API calls at query time.

Data source: OpenStreetMap

OpenStreetMap contributors (ODbL licence), snapshot 2024. High-voltage transmission lines (132 kV and above) are comprehensively mapped across India. Urban distribution lines (33 kV and below) have good coverage in cities; rural coverage is variable. Some recently commissioned lines and private industrial feeders may not yet appear.

OpenStreetMap contributorsODbL licenceSnapshot 2024CEA Safety Regulations 2010

Classification logic

Voltage classification uses the OSM voltage tag on power=line ways. Where multiple voltages are tagged on the same physical line (common for multi-circuit towers), the highest voltage is used for the clearance calculation — conservative approach. Substations are identified via power=substation nodes and ways.

Limitations

OSM voltage completeness: Approximately 30–40% of OSM power line ways in India lack a voltage tag. For untagged lines, voltage is estimated from the line’s role in the network topology — this estimate may be wrong. Verify with DISCOM.
No official RoW boundary data: The statutory Right of Way boundary is not publicly available as GIS data. This tool uses the safety clearance distance (smaller than the RoW) as a conservative proxy.
Underground cables: Underground HV cables do not appear on OSM maps as clearly as overhead lines. If your plot is in a dense urban area, underground cables (which carry no overhead restriction) may exist but not be shown.
Private and industrial feeders: Lines supplying industrial estates, SEZs, and private captive power users are rarely mapped in OSM and are not included in this analysis.

Frequently Asked Questions

Can I build under or near a high-tension power line?

Construction directly under HT lines is restricted within the safety clearance zone defined in CEA Safety Regulations 2010. Buildings, trees, and permanent structures must maintain minimum clearances from the nearest conductor — ranging from 5 m for 11 kV to 30 m for 400 kV. Approval from the local electricity board is required before construction within the clearance zone.

What is the Right of Way (RoW) for a power line, and is it bigger than the clearance zone?

Yes — the RoW is always wider than the safety clearance. Transmission companies hold a statutory RoW corridor (typically 26 m for 66 kV up to 52 m for 400 kV, measured as total width centred on the line). No permanent structure is permitted within the RoW. This tool uses the safety clearance distance as a conservative proxy — the actual restricted zone may be wider. Contact your State Transmission Utility for the notified RoW width.

Do HT lines affect health for people living nearby?

The scientific consensus on EMF health effects from power lines at typical setback distances is inconclusive. ICNIRP guidelines — which India follows — set reference levels for public exposure that are not exceeded at standard clearance distances. However, many buyers and lenders treat HT line proximity as a negative factor regardless of regulatory status, which can affect resale value and mortgage eligibility.

Is a substation nearby a problem or a benefit?

Primarily a benefit. A nearby substation indicates grid infrastructure maturity — reliable supply, shorter distribution run, faster connection sanction, and lower voltage drop. For industrial, commercial, or data centre use, substation proximity is a key siting advantage. Substations are not subject to the same setback rules as overhead lines, though local planning rules may apply near high-voltage transmission substations.

The voltage shown seems wrong for the line near my plot. Why?

OSM voltage data is contributed by mappers and may be incomplete or outdated. Approximately 30–40% of power line ways in India lack a voltage tag — in these cases we estimate voltage from the line’s network role, which may be incorrect. For any construction decision near an HT line, verify the actual voltage with your local DISCOM or by contacting POWERGRID for transmission lines.

Where does this data come from?

Power infrastructure boundaries are from OpenStreetMap contributors (ODbL licence). High-voltage transmission lines (132 kV and above) are comprehensively mapped. Distribution lines have good urban coverage but variable rural coverage. For definitive records and the official RoW boundary, contact your state electricity distribution company (DISCOM) or POWERGRID.