MGVCL Underground Cabling: Why GPR Survey Comes First

Updated: 23 October 2026

Why does MGVCL underground cabling put the GPR survey first?

Any plan for MGVCL underground cabling starts with the utility itself. Madhya Gujarat Vij Company Ltd. (MGVCL) is the state power distribution company for central Gujarat, with its head office in Vadodara. It serves seven districts – Vadodara, Anand, Kheda, Panchmahal, Dahod, Chhota Udepur and Mahisagar – across roughly 23,854 sq km (Power Line, Aug 2021). Most of that network was built overhead: in March 2020 its underground line length was only 0.114 times its overhead length (Power Line, Aug 2021).

That balance is starting to shift. In August 2026 a listed contractor reported being L1 for MGVCL work worth ₹275.05 crore (Kalkine, 24 Aug 2026), and in October 2026 another reported an order of ₹471.92 crore (Whalesbook, 12 Oct 2026). The reported scope covers converting 11 kV overhead lines to covered conductor and building underground networks, including work in the Borsad, Nadiad City and Baroda areas.

For the contractors who carry out this work, the MGVCL underground cabling GPR survey is the first field task, because no cable can go into a road until the services already in it are known. Mezux Touch is not affiliated with MGVCL or any other DISCOM; this article is written for contractors and uses only public information about the utility.

What does overhead-to-underground conversion actually involve?

Two different kinds of work are often grouped under conversion, and they touch the ground in different ways.

• Covered conductor: the bare overhead wire is replaced with an insulated conductor that stays on poles. Digging is limited to new or shifted pole foundations and earthing, but each of those pits can still meet a buried service.
• Underground network: the overhead line is removed and its load moved to underground cable laid in trenches or ducts below roads and footpaths. This means continuous excavation along the route, bored crossings under main roads, drains and railway lines, and pits for joints and for ground-mounted equipment.

The underground share is where a utility survey earns its place. A trench several hundred metres long in a town like Nadiad or Anand passes over, beside and under services laid by the municipality, gas distribution companies, telecom operators and the DISCOM itself. Where existing services cross the path, the cable has to go over or under them with clearance, and the designer needs that information before the alignment is frozen.

Why must existing services be found before the first trench?

Overhead lines never had to share space with buried pipes, so the old network gave little reason to keep an underground record of the roads it ran along. Town centres in central Gujarat also carry water mains and drains laid in several phases, telecom ducts added by different operators, and gas networks extended street by street. Drawings for these lines, where they exist, sit with different owners and are rarely tied to a common reference.

For a conversion contractor this creates three practical risks:

• Strikes on live services – a damaged water main or gas service stops the gang and invites a repair claim.
• Alignment changes mid-work – a congested stretch found only when the trench is open forces redesign while labour and machines stand idle.
• Disputes over quantities – extra hand-digging, crossings and diversions that were not foreseen in the BOQ are hard to recover later.

Scanning the route with ground penetrating radar (GPR) first moves these discoveries to the desk stage, where they cost the least. Our GPR survey in Vadodara page describes the ground and road owners in the MGVCL head-office city.

Which survey tasks does a conversion package need?

Route survey for trenched sections

The core task: a scan along and across the planned cable path, recording the position and approximate depth of the underground utilities already there, marked on the ground and logged for the designer. Our HT/LT cable route survey in Vadodara page shows how this works on city roads.

Crossing survey for bored sections

Where the cable must pass under a highway, a canal, a large drain or a rail line, the bore path and its entry and exit pits are scanned in their own right. Depth matters most here, and the report must say how deep the radar could actually see. Our guide to HDD crossing surveys in Gujarat covers this step.

Spot scans for pits and foundations

Joint bays, pits for ground-mounted equipment and new pole foundations on covered-conductor lines are small excavations, but each one can land on a service. A short close-grid scan clears the spot before digging.

L-section where the scope asks for it

Some packages ask the contractor to submit a depth profile of the services along the route. An L-section survey adds that profile and should be ordered together with the route survey so one field pass serves both.

Which terms in a conversion scope relate to the survey?

• OH to UG: shorthand for overhead-to-underground conversion, meaning lines removed from poles and replaced with buried cable.
• Covered conductor: an insulated overhead conductor; the line stays on poles, so survey needs are limited to foundation pits.
• L1: the lowest bidder in a tender evaluation, who is usually offered the work.
• BOQ survey item: the line in the bill of quantities under which the utility survey is measured and paid, normally per running metre of route.
• Existing-services record: the marked-up record of buried lines found along the route, submitted before excavation where the work order asks for it.
• As-built: the record of where the new cable was actually laid, which should be read together with the survey record.

When a scope is unclear about which of these deliverables it expects, send the clause with your enquiry and we will price exactly what is written, no more and no less.

What separates a useful survey from a paper exercise?

A survey can satisfy a submission requirement and still be of little use to the gang on site. On conversion work, the following points make the difference:

• Pace matched to excavation: scanning and marking should stay a few days ahead of the trench across every division, not finish in one area while another digs blind.
• Honest depth statements: in Vadodara's alluvium with moderate clay, Mezux notes put typical penetration depth at 2.5–3.5 m in open ground. Elsewhere in the MGVCL area soil type and moisture content set it, and it should be stated section by section.
• Two methods, not one: radar for all materials, and an EM cable locator to confirm metallic utilities – live cables and metal pipes.
• Unknown lines flagged: a line nobody can identify is recorded as unknown and raised with the site team, not dropped from the record.
• Same standard in every division: the record from a rural feeder near Dahod should read the same way as one from a Vadodara city road.

Our power utilities sector page explains how distribution networks use these records more widely.

How should a contractor plan the survey on an MGVCL package?

1. Collect routes by division. Ask for the alignment of each section as KML or drawings and group them the way your contract splits the work.
2. Size the quantity. Measure route length per division, add the bored crossings, and identify the part of the route where an L-section is required. Our guide to survey quantities in a DISCOM tender BOQ walks through this.
3. Price the whole order. At ₹24 per metre a standard survey costs ₹24,000 per km. Once the order passes 100 km, every metre drops 25%, so a 150 km standard survey is billed at ₹18 per metre, or ₹27 lakh before GST. Further slabs apply above 500 km (40% off) and 1,000 km (50% off).
4. Add the separate items. Mobilisation, night-shift working, traffic arrangements and permissions, and CAD/GIS drawing sets are not part of the per-metre rate. As the MGVCL area is outside Delhi NCR, a ₹1,00,000 per-project minimum also applies, along with the 4 km minimum length.
5. Sequence with excavation. Give us the order in which divisions will start digging, so survey crews arrive there first.

What records should be kept after the survey on conversion work?

Conversion packages generate a lot of paper, and the survey record is easy to lose among it. Keep it organised from day one:

• File each division's survey report, marking notes and any drawings under the same section references used in the work order.
• Record every change to the alignment made because of survey findings, with the reason, so the as-built and the survey agree.
• Note trial pits or boreholes that confirmed or corrected a depth; these are the most valuable lines in the whole record.
• Keep the list of stretches that could not be scanned, and whether they were later checked by hand.
• Hand over copies in the form your contract specifies at completion.

For divisions outside Vadodara, our Anand and Nadiad pages describe local roads, crossings and survey planning.