Power is the silent backbone of telecom infrastructure. Without a steady electricity supply, even the best radio hardware and backhaul cannot deliver consistent service. India operates more than 0.8 million mobile towers across regions. As per industry reports, the sector consumes over 7.15 billion litres of diesel annually, at an average of roughly 8,760 litres per tower. Much of this is driven by sites with unstable or limited grid supply, forcing operators to rely on generators to keep services running. When generators become the fallback, the operational load rises. These sites require more field visits because gensets must be checked, refuelled and repaired more often. Across a large network, this effort adds up quickly.

This is where storage changes the equation. By providing a stable buffer between the grid and the site, batteries reduce the frequency of generators start-ups, reduce their runtime and smooth out power fluctuations that would otherwise trigger alarms or outages.

A look at how energy storage supports telecom operations…

Technology landscape

Lead-acid batteries remain an economical option in many legacy deployments because of their low upfront costs and familiarity with the technology. Their limitations include a short cycle life, large footprint per kWh, high ongoing maintenance requirements and poor performance in deep-cycle hybrid scenarios. Lithium-based chemistries are now replacing lead-acid batteries. Its key advantages include higher energy density, longer cycle life, faster recharge capability and lower maintenance overhead. For sites that combine solar, grid and generators, lithium batteries have deeper discharge profiles and deliver more predictable performance across seasons.

Meanwhile, containerised battery energy storage systems (BESSs) are emerging as the preferred option at larger sites and campuses. They package batteries, thermal management, controls and safety systems into a scalable module that reduces on-site civil works and simplifies commissioning. Containerised units also make it easier to scale storage incrementally as site power demands grow; for example, when new ­radios or edge compute nodes are added.

As adoption increases, usage across different site set-ups is becoming more defined. Deployments vary across the network. At one end are small tower-top or shelter-level battery banks that provide brief ride-through during short outages. In the middle are hybrid systems that pair solar arrays with batteries and a managed generator, making them a practical fit for locations that get reliable daytime solar. At the larger end, a containerised BESS is deployed at campus sites and edge data centres, smoothing multiple power feeds, and where permitted, even supports grid-support functions.

Technological impact

Storage delivers several operational outcomes including improved uptime, lower operational expenditure and simpler scaling of power capacity:

  • Improved uptime: Storage smooths transient grid dips and manages short outages without triggering generator starts. In portfolios where outages are frequent, this converts noisy alarm spikes into quiet transitions that rarely require human intervention.
  • Fuel and maintenance savings: By carrying short- and medium-duration loads, batteries reduce generator runtime.
  • Planning benefits: Clear expectations of storage capacity allow network developers to plan generator and solar investments, reduce redundant capacity and sequence upgrades with minimal disruption.
  • Total cost of ownership: While lithium systems typically involve ­higher upfront capital expenditure than lead-acid, their lower maintenance requirements, longer service life, and reduced generator fuel and servicing often result in a lower life cycle cost per kWh delivered.

Safety and sustainability

Batteries and BESSs bring clear benefits, but they also require careful handling. Thermal design, fire suppression and compliance with safety standards are key factors that determine system reliability. Operators also need a realistic end-of-life plan, including when batteries need to be replaced and strategies for recycling or repurposing. Clear performance guarantees from vendors help align expectations with real-world cycling conditions.

Storage also supports a broader shift in how networks are powered. By capturing and using more on-site renewable energy, operators can cut diesel usage and make steady progress towards their sustainability commitments.

Future outlook

Energy storage has emerged as a critical component of the basic power design of a telecom site. As radio layers get denser, 5G traffic grows and fuel costs remain unpredictable, storage enables networks to expand without any power constraints. The next phase of growth will make its role even more evident. More sites are coming up and edge compute is moving closer to the tower, introducing far more variation in power demand throughout the day. Batteries and BESSs will play an increasingly important role in handling this variability.

This shift will also reshape operator decision-making. Operators that adopt a more standardised approach to procurement and invest in robust energy management systems and remote monitoring will be able to fully leverage the benefits of energy storage.