Ditch the Diesel.
Switch to Battery.
Sub-10ms switching is invisible to PLCs and CNC machines — permanently eliminating the raw material waste that costs manufacturers up to 1% of annual turnover.
Can You Replace a Diesel Generator with Battery Storage in India?
Yes. Replacing a diesel generator with a Battery Energy Storage System (BESS) in India saves 70–77% on backup energy costs, delivers sub-10ms switchover speed invisible to PLCs and CNC machines, and requires zero upfront capital under PWRNXT's operating lease model.
A diesel generator costs ₹25–30 per kWh of actual backup power once fuel inefficiency, delivery, and storage losses are counted. A BESS charges from the grid at off-peak tariffs of ₹7–8 per kWh — delivering the same output at a fraction of the cost.
Every diesel generator takes 10–30 seconds to reach stable voltage after a grid failure. During that gap, PLCs reset, CNC machines fault, cold rooms alarm, and in-process batches are lost. PWRNXT BESS switches in under 10 milliseconds — permanently eliminating the switchover gap.
PWRNXT deploys LFP BESS from 125 kW upwards across manufacturing, cold storage, hospitals, and commercial buildings throughout India — on a zero-capex operating lease with a contractual 98.5% uptime SLA and 24/7 remote monitoring.
DG vs BESS Savings Calculator
Liveequipment + AMC incl.
What the Switch Looks Like On Your P&L
The numbers below use real-world inputs from a 500 kVA facility running 200 outage hours per year — typical for a mid-sized manufacturing plant or cold storage facility in North India.
The BESS quarterly lease is structured to sit at or below your current quarterly diesel spend. Most clients see positive net cash flow from month one — with operating margin improvement visible from the first quarterly close.
Share your DG capacity and monthly diesel consumption and we will return a personalised P&L within 24 hours.
Talk to Our Team →What Your DG Really Costs You
Diesel fuel is only the start. The true all-in cost is 3–4× higher once every P&L line is counted.
Fuel: ₹25–30 per kWh
After accounting for thermal efficiency losses, delivery and on-site storage, diesel backup power costs ₹25–30 per kWh — versus ₹7–8/kWh for grid-charged BESS. You pay 3–4× more for every hour your DG runs.
Maintenance & Staffing
Oil changes, injector servicing, load bank testing and AMC contracts add up to ₹200/kVA per year — a cost that rarely appears in the backup power budget but is a real recurring liability on every facility's P&L.
The 10–30 Second Gap
Every DG takes 10–30 seconds to reach stable voltage after a grid trip. In that window, PLCs reset, CNC machines fault and cold rooms alarm. No diesel generator eliminates this switchover gap — BESS does.
Total All-In Backup Power Cost — 500 kVA Facility
Fuel + maintenance + operator + production loss from switchover delay, 200 outage hours/year
Every Reason to Make The Switch
Financial, operational, environmental, strategic — BESS replaces diesel across every dimension.
Sub-10ms Switchover
PWRNXT BESS transitions from grid to battery in under 10 milliseconds — invisible to PLCs, CNC controllers and server UPS systems. The 10–30 second DG spool-up gap that causes downstream production loss is permanently eliminated.
77% Energy Cost Reduction
BESS charges at off-peak grid tariffs (₹7–8/kWh) and dispatches during outages — replacing diesel at ₹25–30/kWh. A 500 kVA facility running 200 outage hours per year saves ₹18–25 lakh annually on energy alone.
Zero Local Emissions
No NOx, no PM2.5, no CO₂ at your facility. Removes emission compliance liability, eliminates diesel exhaust health risk, and delivers verifiable Scope 1 reductions for ESG and BRSR reporting from day one.
Zero Capital Required
PWRNXT owns, installs and insures the asset. You pay a fixed quarterly operating lease — 100% tax-deductible as OpEx, off your balance sheet. No CapEx approval, no depreciation, no technology risk.
Diesel Generator vs PWRNXT BESS
Every parameter your operations, finance, and sustainability teams care about — compared directly.
| Parameter | 🔴 Diesel Generator | 🟢 PWRNXT BESS |
|---|---|---|
| Switchover Speed | 10–30 seconds to operational voltage PLCs Reset | <10ms — invisible to all control systems Zero Impact |
| Energy Cost | ₹25–30/kWh all-in (fuel + losses + logistics) | ₹7–8/kWh off-peak grid charging 77% Cheaper |
| Local Emissions | NOx, PM2.5, CO₂ at point of use Compliance Liability | Zero local emissions — 100% clean ESG Compliant |
| Noise Level | >85 dBA continuous — noise compliance risk Restricted Zones | ~75 dB near-silent solid-state operation No Restriction |
| Maintenance | Oil, filters, coolant, injectors, load bank testing — ₹8–12L/yr | Quarterly check by PWRNXT — zero internal workload Included in Lease |
| Fuel Supply Risk | Diesel procurement, storage, price volatility, quality risk Operational Dependency | No fuel — charges from grid at fixed tariff Zero Supply Risk |
| Capital Cost | High upfront CapEx for new DG or refurbishment | ₹0 — PWRNXT-owned on operating lease Off Balance Sheet |
| Uptime Guarantee | No SLA — performance depends on operator and maintenance quality | Contractual 98.5% uptime SLA with 24-hr MTTR Enforceable |
| Regulatory Trajectory | Increasing emission norms, CPCB compliance burden Tightening | Zero emission — future-proofed against all regulations Future-Proof |
From DG to BESS — In Four Steps
Your existing DG stays live until BESS is commissioned and signed off. Zero gap in coverage at any point.
Feasibility Study
Our engineers audit your existing DG set, capture your load profile and historical outage data, and calculate the optimal BESS capacity to match or exceed your current backup coverage. Returned within 5 business days at zero cost.
Lease Agreement
We present a fully modelled financial case — BESS lease cost vs current DG cost, complete P&L impact, SLA terms and exit provisions. Standard lease term 5–7 years. Your finance and legal teams review before signing.
Parallel Installation & Testing
PWRNXT installs and commissions the BESS alongside your running DG — never in place of it. Full Site Acceptance Testing confirms sub-10ms switching and SLA compliance before your DG is reclassified as secondary or retired.
PWRNXT Takes Operations
From go-live, PWRNXT manages all BESS operations, monitoring and maintenance. Your DG operator's workload reduces significantly. Your quarterly invoice replaces your diesel fuel budget and AMC contract.
Zero-risk transition guaranteed. Your existing diesel generator remains fully operational and available throughout the entire installation and testing period. We will not decommission your backup power coverage at any point. BESS goes live only after Site Acceptance Testing confirms every performance parameter has been met.
DG Replacement FAQ
The questions operations heads and CFOs ask us most.
Can BESS completely replace my diesel generator?
For most C&I applications, yes. PWRNXT BESS sized to your load profile handles all routine outage events without any DG involvement. For sites requiring very long backup durations (over 4 hours), a hybrid BESS + DG configuration works best — BESS handles the sub-10ms switchover and short outages, while the DG remains available for extended grid failures. Both approaches eliminate the switchover gap entirely.
How much will I actually save by replacing my DG with BESS?
Most clients save 70–77% on backup energy costs. BESS charges at off-peak grid tariffs (₹7–8/kWh) vs diesel at ₹25–30/kWh all-in. For a 500 kVA facility running 200 outage hours per year, that is ₹18–25 lakh in energy savings before counting maintenance cost elimination and production loss recovery. Share your DG capacity and diesel spend and we will calculate your specific number within 24 hours.
How long does the transition from DG to BESS take?
From signed lease to commissioned BESS is typically 6–10 weeks depending on system size and site preparation. Critically, we install and test the BESS in parallel with your running DG — your backup power is never at risk during the transition. We do not decommission your DG until the BESS has passed full Site Acceptance Testing.
What happens to my existing DG set once BESS is installed?
You have two options. Most clients retain the DG as a secondary backup for extended outage events — which account for less than 5% of annual outage incidents for most facilities. Some clients decommission the DG entirely once the data confirms BESS covers all routine events, and recoup the ongoing maintenance and AMC contract cost. We recommend the hybrid approach for the first 12 months while you build confidence in the outage data.
Is there any capital required to move from DG to BESS?
Zero. PWRNXT purchases, finances, installs and insures the BESS asset — it sits entirely on our balance sheet. You pay a fixed quarterly operating lease that is 100% tax-deductible as OpEx. No CapEx approval, no depreciation, no asset management. For most clients, the quarterly lease is structured at or below their current quarterly diesel spend — making the cash flow impact neutral or positive from day one.
What certifications does PWRNXT BESS hold — is it safe for industrial use?
Our systems are built on Tier-1 OEM components from CATL, BYD, EVE Energy, Sungrow and Delta — certified to UL 9540A (fire safety for BESS), IEC 62619 (lithium battery safety for industrial use) and CE standards. We use LFP (Lithium Iron Phosphate) chemistry exclusively — the safest lithium chemistry available, with no thermal runaway risk. Our IP55 outdoor-rated enclosures require no special infrastructure in most Indian industrial parks.
Ready to Replace
Your Diesel Generator?
Commission a data-backed feasibility study. Our engineers calculate your all-in diesel cost, size the right BESS for your facility, and show you exactly what you save — month by month — within 5 business days.