Land is usually the first practical question on a storage project and, until recently, the one with the least official guidance behind it. Developers were sizing sites from their own experience because India had no published minimum land criterion for battery capacity at all.
That changed in 2025.
The CTUIL benchmark
CTUIL (Central Transmission Utility of India Limited) is the body that handles connectivity to the interstate transmission network. In May 2025 it published, for stakeholder feedback, a proposed benchmark:
A minimum of 3 acres per 100 MWh as the land requirement for establishing a battery energy storage project.
CTUIL arrived at the number by analysing land requirements submitted by BESS developers, taking into account the layout of battery containers, the power conversion system and transformers, alongside current technology, safety regulations, infrastructure needs and room for future expansion.
Three acres per 100 MWh works out to roughly 0.03 acres — about 1,300 square feet — per MWh. That is broadly in line with the general industry rule of thumb of around 1,000 square feet per MWh for the container footprint itself.
What you must show, and when
The benchmark has teeth at the connectivity stage. When applying for connectivity to the ISTS (interstate transmission system) network, a developer must submit land documents corresponding to at least half the benchmark requirement — the balance comes later in the process.
The logic is sensible: it would be punishing to require a developer to tie up an entire site before knowing whether connectivity will be granted at all. Half is enough to demonstrate the project is real. If you are working through the connectivity process, our guide to General Network Access and grid connectivity for storage covers what else sits in that application.
The area the benchmark does not cover
This is where site plans go wrong. The CTUIL figure covers the equipment — containers, power conversion, transformers. A working site needs more than equipment.
- Access roads wide enough for a truck to deliver and eventually remove a container.
- Safety setbacks between container rows and to the site boundary, driven by fire separation requirements.
- Transformer and switchyard area, which grows with voltage level.
- Perimeter fencing and buffer, plus space for security and site offices.
- Expansion room, if the project has a phase two or will need augmentation later.
General industry guidance puts a complete site at meaningfully more than the container footprint — commonly a multiple of it once roads, setbacks and buffers are counted, with the exact figure driven by local codes and project design.
| What drives the area | Effect on land |
|---|---|
| Battery energy density | Lower container footprint per MWh |
| Fire separation distances | Larger gaps between rows — often the binding constraint |
| Voltage level of connection | Bigger transformer yard and switchyard |
| Truck access and craneage | Wider roads, more turning area |
| Planned phase two | Reserved land that sits empty for years |
Fire separation deserves emphasis because it frequently sets the layout rather than the batteries do. Our article on fire safety and thermal runaway explains why those clearances exist, and the choice between containerised and cabinet form factors changes the arithmetic significantly for smaller sites.
What this means for you
- If you are a developer or IPP: use 3 acres per 100 MWh to screen a site, not to buy one. Do a real layout with fire separation and truck access before you commit, because setbacks routinely push the practical requirement above the benchmark.
- If you are a C&I buyer: this benchmark is aimed at grid-connected projects seeking ISTS connectivity. A behind-the-meter system at your factory is a different scale question entirely — often a corner of a yard or a plant room rather than acres. The ADESS 250 cabinet fits beside the load in roughly 1.5 m², which is a different conversation from acres.
- If you are a landowner being approached: understand that the equipment area and the leased area are different numbers, and that a storage project needs far less land than a solar farm of comparable output.
The CTUIL benchmark was issued as a proposal for stakeholder consultation, and connectivity criteria, land norms and documentation requirements change by regulation and notification. Treat the figures here as an August 2026 snapshot and verify current provisions in live CTUIL, CEA and CERC documents before making a land commitment. To scope a system for your own site, try our BESS savings calculator, or get in touch with our team.
Snapshot as of August 2026. Connectivity regulations and land norms change by notification; verify current provisions with CTUIL / CEA / CERC documents before financial or land decisions.