Your Solar Was Right.
MERC's New Rules Broke the ROI.
PWRNXT Closes the Gap.
Zero Upfront Cost.
Whether your solar is rooftop, group captive, or open access — Maharashtra's revised banking rules have ended free, flexible grid storage. The math no longer works without a BESS. Your surplus solar earns ₹2.82/unit at year-end settlement. You buy the same units back at ₹14.31/unit every evening. That ₹11.49 gap runs every single day — on every unit that goes to the grid instead of a battery. PWRNXT's BESS operating lease requires zero capex. We own, install and maintain the system. You pay a fixed quarterly lease and keep the full saving — the solar + BESS payback period is 4–6 years for a typical Maharashtra HT consumer. From April 2026, Maharashtra's REES Policy mandates co-located storage for new solar above 100 kW. PWRNXT BESS is fully REES-compliant — so your financial recovery and your regulatory obligation are solved in a single system.
Three Reasons Your Solar Investment Is Now Underperforming
Maharashtra's revised energy banking framework has broken the financial model that justified your solar investment. Here is what changed — and what it costs you every year.
The Free Battery Is Gone
The grid used to act as your free, unlimited storage. Surplus solar generated between 9am and 5pm could be drawn back at any time — day or night — to offset your facility's consumption. Maharashtra's revised banking rules have ended this. Credits are now locked to the same time window they were generated. If your heaviest load runs after 5pm and your solar peaks during the day, those credits no longer offset your evening bill.
The Gap That Costs You Every Month
Your surplus solar earns approximately ₹2.82 per unit at year-end banking settlement. Your facility pays ₹14.31 per unit for every unit it draws from the grid during the D-zone (5pm–midnight). That ₹11.49 per unit gap runs every single day — on every unit of surplus that goes to the grid instead of into a battery. On a 300 kWp plant, this gap alone is ₹12–15 Lakh a year in value your solar generates but your business does not capture.
Solar Without Storage Is Now a Sunk Cost
Your solar investment was evaluated on a financial model that assumed free, flexible banking. That model no longer holds — whether your solar is on your rooftop, procured through a group captive arrangement, or drawn via open access. Every year without a BESS is another year the solar capex fails to deliver its projected return. The asset is live and generating. The recovery mechanism is what is missing.
What a BESS Does — in Four Steps
PWRNXT BESS is installed behind your billing meter. It captures your surplus solar during the day and discharges it in the evening — restoring the value your solar investment was always meant to deliver.
Captures What the Grid No Longer Will
Surplus solar that would previously go to the grid at ₹2.82 now charges the BESS instead. Whether your solar comes from a rooftop array, a group captive OA plant, or an open access arrangement — the BESS sits behind your HT billing meter and intercepts that surplus before it leaves your premises. Every unit stored is a unit that doesn't become a loss.
Discharges Every Evening — D-Zone by D-Zone
After 5pm, the BESS discharges automatically — covering your facility's grid draw hour by hour during the D-zone (5pm–midnight). Your MSEDCL meter sees near-zero import during the most expensive tariff window of the day. The ₹14.31/unit evening cost is replaced by energy you already paid nothing extra to generate and store.
Restores the Original Solar ROI
The same kWh your solar has always generated now deliver their full financial value instead of being surrendered to the grid at a fraction of their worth. Your solar capex, which has been underperforming since the banking rules changed, begins compounding returns again. The BESS does not add a new cost — it recovers a return that the regulatory change took away.
Zero Capex — PWRNXT Owns It, You Operate It
PWRNXT purchases, finances, installs, and insures the BESS asset. You pay a fixed quarterly operating lease — 100% tax-deductible as OpEx, off your balance sheet. No CapEx approval cycle. No technology risk. No maintenance burden. A contractual 98.5% uptime SLA means the system performs or PWRNXT is accountable. Deployment takes 6–10 weeks from lease signing.
Solar Without BESS vs Solar + PWRNXT BESS
The same solar asset. The same generation. Two completely different financial outcomes — depending on whether you have a BESS behind your meter.
| Parameter | 🔴 Solar Without BESS | 🟢 Solar + PWRNXT BESS |
|---|---|---|
| Surplus solar value | ₹2.82/unit at year-end banking settlement Devalued | ₹14.31/unit D-zone cost avoided — every evening Full Value |
| D-zone grid draw (5pm–midnight) | Full grid cost every shift — ₹14.31/unit Unavoidable | Near zero — BESS covers the evening draw Eliminated |
| Solar investment ROI | Stranded — financial model built on free banking no longer holds Broken | Restored — surplus solar delivers its full intended return Recovered |
| Banking judgment risk (HC) | Fully exposed — if monthly banking upheld, year-end credits lapse at zero High Risk | Indifferent — BESS captures value regardless of annual or monthly ruling Hedged |
| REES Policy compliance (April 2026) | New solar/wind above 100 kW requires co-located storage — non-compliant Non-Compliant | PWRNXT BESS satisfies REES co-location mandate from commissioning Compliant |
| Capital required | Solar capex already invested — underperforming Sunk Cost | ₹0 additional — PWRNXT zero-capex operating lease Zero Capex |
| Net annual benefit | Gap grows every year as D-zone rates escalate | ₹10–14 Lakh/year recovered — improves as D-zone rates rise Growing Return |
| Applicable solar routes | All routes affected — rooftop, group captive, open access | BTM BESS works for all procurement routes — one system, full value Universal Fix |
D-zone rate ₹14.31/unit based on HT Industrial-A category, MSEDCL April 2026. Banking credit ₹2.82/unit based on MSEDCL year-end settlement rate. Actual figures vary by consumer category, contract demand, and load profile.
The Numbers Behind the Gap
The arbitrage case for BESS in Maharashtra is not theoretical — it is built from actual MSEDCL bill data and verified tariff schedules. The model below reflects a typical 300 kWp rooftop or group captive solar installation for an HT industrial consumer running two or three shifts.
Two scenarios are shown. Annual banking (today's position) assumes the Bombay High Court stay protecting the year-end credit pool holds. Monthly banking reflects what happens if the HC upholds MERC's original intent. In both cases, the BESS delivers a positive return. The hardware is the same. Only the base case changes.
Both scenarios share the same conclusion: every month without a BESS is a month the ₹11.49/unit gap runs against you.
(Annual Banking) ₹10.85L
Share your electricity bill and solar capacity. PWRNXT engineers run your specific load profile and return a verified saving figure — within 5 business days, at zero cost.
Your Industry. Your BESS Case.
The banking gap is the same across every sector. But each industry's load profile, shift pattern, and solar procurement route shapes a different BESS story. Here is how it plays out in Maharashtra's major industrial clusters.
Auto & Manufacturing
Multi-shift auto and precision manufacturing plants run continuous loads well into the night — exactly when the D-zone penalty is highest. Group captive OA solar is common in this sector; the banking gap hits hardest when 24×7 load means zero rooftop surplus but the open access schedule still forces evening grid draw.
Pharma & Chemicals
Pharmaceutical and chemical plants run regulated cleanroom HVAC and chiller loads around the clock. Rooftop solar on large flat-roof processing buildings generates significant daytime surplus — surplus that now earns ₹2.82 instead of offsetting the expensive evening chiller load. Batch process reliability makes uninterruptible power a compliance requirement, not just a preference.
Cold Storage & Logistics
Cold chain facilities run compressors at maximum load during peak hours — often timed with produce arrivals in the early evening. The mismatch between rooftop solar generation (day) and peak compressor draw (evening) creates one of the largest per-unit banking gaps in any sector. Solar is already installed on most large cold stores for daytime offset. BESS completes the loop.
Hospitality
Hotels and resorts have a near-perfect solar BESS profile: rooftop solar generates during low-occupancy daytime hours while the property's highest energy draw — kitchens, event lighting, HVAC — runs during the evening guest peak. The LT-II commercial tariff category applies, which carries the widest evening surcharge in Maharashtra's tariff schedule.
Data Centres
Hyperscale and enterprise data centres carry constant baseloads at all hours — making the D-zone tariff a fixed, unavoidable daily cost rather than a peak event. Group captive OA solar is increasingly common in this sector to meet ESG commitments, but without BTM BESS, the arbitrage advantage of the OA arrangement is eroded by evening grid draw costs.
All HT C&I Consumers
The banking gap applies to every MSEDCL HT consumer in Maharashtra who has invested in solar — regardless of sector, location, or procurement route. If you have rooftop solar, a group captive arrangement, a captive plant, or an open access PPA, and your facility's peak load falls after 5pm, the ₹11.49/unit arbitrage gap is running against you today. PWRNXT BESS operating lease closes it with zero capital required.
The Compliance Clock Is Running
Maharashtra's REES Policy has set hard deadlines for solar-plus-storage co-location. The financial case for BESS exists today — the compliance obligation makes it mandatory from April 2026 onwards.
Banking Rules Changed
MERC 5th Control Period MYT Order takes effect. Same-slot banking restriction activates. Free grid storage ends for C&I consumers.
Already LiveREES Mandate — 100 kW Threshold
All new solar and wind projects above 100 kW must co-locate BESS at 50% of RE capacity with minimum 2-hour discharge. New solar without storage is non-compliant from this date.
Live Now4-Hour Duration Mandate
New solar projects must upgrade to 4-hour BESS discharge duration. Consumers who lock in the 4-hour configuration now can access the 10-year Electricity Duty exemption on captive OA consumption.
Upcoming65% Renewable Target
Maharashtra targets 65% of total state electricity demand from renewable sources. DISCOMs must procure storage equal to 10% of peak demand — an estimated 100 GWh daily. BESS infrastructure built today is part of this future.
10-Year HorizonFrom Enquiry to Live BESS — Four Steps
Fast and transparent. Most clients go from first conversation to signed lease in under 30 days.
Feasibility Study
Share your electricity bills, solar generation data, and load profile. PWRNXT engineers baseline your D-zone draw, banking gap, and solar surplus to right-size the BESS and quantify the financial case. Delivered within 5 business days.
P&L & Lease Proposal
We model your complete annual P&L impact — D-zone savings, banking gap recovered, REES compliance value — alongside the operating lease term sheet. Both scenarios (annual and monthly banking) shown. Fully auditable assumptions.
Legal & Commercial Review
Standard 5–7 year operating lease. Your finance and legal teams review the SLA, performance guarantee, and exit provisions. PWRNXT discloses every clause — MSEDCL interconnection, REES compliance filing, and metering arrangements are all documented upfront.
EPC & Go-Live
PWRNXT manages full installation — design, procurement, civil works, MSEDCL interconnection, commissioning and Site Acceptance Testing. System live within 6–10 weeks of lease signing. PWRNXT operates and monitors everything from go-live.
The Commitments Behind Every Lease
A lease is only as good as the organisation behind it. Here is what you can hold us to.
Tier-1 OEM Components
PWRNXT systems are built on Tier-1 LFP battery cells from CATL, BYD and EVE Energy, with inverters from Sungrow and Delta. Certified to UL 9540A, IEC 62619 and CE standards. No thermal runaway risk. This is what backs the 98.5% uptime SLA.
Contractual SLA — Not Best-Effort
The 98.5% uptime guarantee is a contractual obligation with defined remedies — not a marketing claim. If PWRNXT misses the SLA, the lease agreement specifies the credit or remedy. Your finance team can model worst-case scenarios and they are covered in writing.
Proven in Live Deployments
Our Haryana auto ancillary deployment has operated across 200+ annual outage events with zero production impact. The operating lease model, SLA structure, and EMS operations are all live, verified and auditable — not a concept proposal.
24/7 Remote EMS Operations
Our Energy Management System monitors every BESS parameter continuously. Predictive fault detection flags our engineering team 2–4 weeks before any potential failure. Your facility team has zero BESS operational workload — all included in the lease at no additional cost.
ESG & BRSR-Ready Reporting
PWRNXT EMS generates complete, auditable energy and emissions data. Every kWh dispatched, every tonne of CO₂ avoided is logged and exportable for annual ESG, BRSR, and sustainability reporting — directly from our system, no manual calculation required.
Backed by Financing Partners
PWRNXT structures its leases through partnerships with leading NBFCs and green capital funds — giving your CFO and legal team institutional-grade counterparty confidence that the lease is underwritten by established financial partners, not solely by PWRNXT's own balance sheet.
Deep-Dive Regulatory Guides
The two articles below go deeper on the regulatory and financial mechanics behind the Maharashtra BESS opportunity. Both are free, no registration required.
MERC MYT Order 75 of 2025: Five Changes Every C&I Consumer Must Act On
The complete breakdown of what changed in Maharashtra's tariff framework — same-slot banking restrictions, the removal of the night rebate, the GSC mechanism, and what each change means for your electricity bill. Includes the full ToD tariff schedule and verified rate data for FY 2025–26 to FY 2029–30.
Read the full guide → Strategy & ArbitrageWhat Is the Cheapest Electron You Can Land at Your Meter — and How Does BESS Maximise What You Keep?
A complete strategic framework for HT industrial and commercial consumers in Maharashtra. Covers the full ₹6–19/kVAh arbitrage spread, the intermediate storage exemption under REES Policy Section 5.1, BTM vs co-located BESS value comparison, and the 2-hour vs 4-hour sizing decision.
Read the full guide →Maharashtra BESS — Your Questions Answered
Our engineers have answered these questions for plants in Chakan, Waluj, and Mumbai. Share your situation — we'll give you a straight answer in one conversation.
💬 Ask Our Maharashtra TeamCommission Your Maharashtra Feasibility Study
Share your electricity bill, solar capacity, and shift pattern. Our engineering team sizes the right BESS for your facility, models both banking scenarios, and returns a detailed P&L with the net annual saving figure — within 5 business days, at zero cost.