Reduce common area electricity costs by 50-70%, directly lowering resident maintenance bills.
Showcase society's commitment to sustainability. Attract environmentally conscious residents and improves society reputation.
Solar savings clearly documented and visible to residents. Builds trust in management.
Properties in green societies command 3-5% premium in market. Attracts buyers valuing sustainability.
Reduces dependency on grid. Backup power available for lifts during brief outages (with battery).
Communities reduce carbon footprint collectively. Align with national net-zero 2070 commitments.
Typical Housing Society Consumption:
Society Profile: 400-500 Unit Complex
Common Area Loads:
Lighting
– Entrance/lobby: 100W × 12 hours = 1,200 units/year
– Corridors & stairwells: 500W × 10 hours = 1,825 units/year
– Parking area: 2,000W × 10 hours = 7,300 units/year
– Garden & grounds: 1,500W × 8 hours = 4,380 units/year
Total Lighting: ~14,705 units/year
ELEVATORS (assuming 8 elevators)
– Per lift consumption: 8,000W × 4 hours/day = 32 units/day
– 8 lifts × 32 units = 256 units/day
– Annual: 256 × 365 = 93,440 units/year
Water Pumping & Treatment
– Main pump: 7,500W × 3 hours/day = 22.5 units/day
– Backup pump: 7,500W × 2 hours/day = 15 units/day
– Treatment: 1,000W × 2 hours/day = 2 units/day
– Annual: (39.5 units/day) × 365 = 14,427.5 units/year
Security & Access Control
– CCTV: 500W × 24 hours = 12 units/day
– Access control: 200W × 24 hours = 4.8 units/day
– Security cabin: 2,000W × 12 hours = 24 units/day
– Annual: (40.8 units/day) × 365 = 14,892 units/year
Amenities (Gym, pool, clubhouse if applicable)
– Gym equipment & lighting: 5,000W × 6 hours = 30 units/day
– Pool circulation: 3,000W × 8 hours = 24 units/day
– Clubhouse: 4,000W × 8 hours = 32 units/day
– Annual: (86 units/day) × 365 = 31,390 units/year
MISC (Landscaping, maintenance equipment, etc.)
– Average: 10 units/day
– Annual: 3,650 units/year
Total Common Area Annual Consumption:
14,705 + 93,440 + 14,427.5 + 14,892 + 31,390 + 3,650 = 172,504.5 units/year
Average: ~475 units/day
Monthly Average: ~14,375 units/month
Monthly common Area Electricity Bill:
– 14,375 units × ₹8/unit = ₹1,15,000/month
– Annual: ₹13,80,000/year
– Per Unit Contribution (500 units): ₹2,300/month
WITH 50 kW SOLAR SYSTEM:
– Annual generation: 75,000 units
– Annual savings: 75,000 × ₹8 = ₹6,00,000
– New annual cost: ₹13,80,000 – ₹6,00,000 = ₹7,80,000
– New per-unit cost: ₹1,300/month (43% reduction!)
Initial Presentation
– Society management committee meeting
– Present solar benefits, financial projections, case studies
– Address concerns and questions
– Discuss governance and decision-making process
Detailed Proposal Preparation
– Site assessment (terrace, available space)
– Custom system design for society’s consumption
– Financial projections showing maintenance charge reduction
– ROI calculation, payback period analysis
– Financial projections showing maintenance charge reduction
Society-Wide Communication
– Circulate proposal to all residents
– Organize open information session
– Address resident concerns and questions
– Transparency about costs, savings, governance
General Body Meeting & Voting
– Present proposal in official general body meeting
– Take formal vote (typically >50% approval required)
– Document approval through meeting minutes
– Communicate decision to all residents
Structural Assessment
– Engineers evaluate terrace/installation location
– Check structural capacity, wind load considerations
– Identify any necessary strengthening
– Provide structural fitness certificate
Government & MSEDCL Approvals
– Apply for net metering through society management
– Obtain building/municipal approvals (if needed)
– Apply for MSEDCL net connection permission
– Get building permission and NOC
Financial Arrangements
– Finalize funding method (see financing options)
– Collect maintenance deposit from residents (if required)
– Set up dedicated society solar account for transparency
– Prepare financial governance structure
Material Procurement
– Source quality panels, inverters, equipment
– Verify certifications and warranties
– Schedule delivery to site
Installation Execution
– Minimal disruption—work during non-peak hours
– Install mounting structures
– Mount solar panels
– Install inverter and balance system
– Electrical connections and safety setup
– Final safety inspections
Performance Testing
– Test system under various conditions
– Verify expected generation matches projections
– Check all safety systems
Grid Synchronization
– Install net meter with MSEDCL approval
– Synchronize with grid
– Final inspection by MSEDCL
Handover & Training
– Provide operation manual to management
– Train society management committee on monitoring
– Explain monitoring app/portal
– Document all warranties and guarantees
Throughout Process:
– Transparency: Monthly updates to residents on progress
– Communication: Address concerns promptly
– Governance: Regular management committee briefings
– Documentation: Maintain complete records for society archives
Solar Management Committee
– Constituted from society management committee
– Comprises: President, Treasurer, Secretary + 2-3 interested residents
Responsibilities:
– Oversee system performance
– Manage maintenance contracts
– Track financial benefits
– Communicate with residents
– Plan future expansions
Financial Management
– Dedicated solar savings account (separate from general society funds)
– Transparent monthly accounting of:
– Generation (units produced)
– Savings realized (₹ amount)
– Maintenance expenses
– Net benefit to maintenance fund
– Annual audit by independent auditor
– Quarterly reports to general body
Benefit Sharing Mechanism
– Document how solar savings benefit maintenance charges
– Clarify whether:
– Maintenance charges reduced immediately
– OR savings retained for system expansion/upgrade
– OR hybrid approach (part reduced, part saved)
– Ensure fairness—benefits proportional to maintenance share
Maintenance Schedule
– Professional maintenance contract
– Clear escalation procedures for issues
– Emergency contact protocol
– Annual preventive maintenance plan
– Quarterly performance reviews
Future Expansion Plan
– Document roadmap for individual rooftop installations
– Plan multi-phase expansion if additional roof space available
– Discuss battery addition (for backup power) in future phases
Financial Scenario: 500-Unit Housing Society
Current Situation (Without Solar):
Common Area Annual Electricity Cost: ₹13,80,000
Per Unit Annual Share: ₹2,760
Per Unit Monthly Contribution: ₹230
After 50 kW Solar Installation:
System Cost: ₹22,50,000
MNRE Subsidy (30%): -₹3,00,000
State Incentive (if applicable): –₹1,50,000
NET SOCIETY INVESTMENT: ₹18,00,000
Annual Solar Generation: 75,000 units
Annual Electricity Savings: 75,000 × ₹8 = ₹6,00,000 New Annual
Electricity Cost: ₹13,80,000 – ₹6,00,000 = ₹7,80,000
MONTHLY IMPACT PER UNIT:
From ₹230 → ₹130 (43% reduction)
Monthly Savings per Unit: ₹100
ANNUAL SAVINGS PER UNIT:
₹2,760 – ₹1,560 = ₹1,200/year
SOCIETY-WIDE ANNUAL BENEFIT:
500 units × ₹1,200 = ₹6,00,000
25-Year Projection:
SCENARIO A: Direct Maintenance Charge Reduction
Year 1-5: ₹6,00,000 × 5 × 0.95 = ₹2,85,00,000
Year 6-10: ₹6,00,000 × 5 × 0.90 = ₹2,70,00,000
Year 11-15: ₹6,00,000 × 5 × 0.85 = ₹2,55,00,000
Year 16-20: ₹6,00,000 × 5 × 0.80 = ₹2,40,00,000
Year 21-25: ₹6,00,000 × 5 × 0.75 = ₹2,25,00,000
———–
TOTAL 25-YEAR SAVINGS: ₹12,75,00,000
Less: Maintenance ₹50,000/year: -₹12,50,000
NET BENEFIT: ₹12,62,50,000
Per Unit 25-Year Benefit: ₹25,245
PAYBACK PERIOD FOR SOCIETY: 3 years
Alternative: Savings Reinvestment
If society retains solar savings for expansion/reserves:
Phase 1 (5 years):
– Accumulate ₹30,00,000 (5 years × ₹6,00,000)
– Pay off ₹18,00,000 initial investment
– Retain ₹12,00,000 for Phase 2 expansion
Phase 2 (Year 6-10):
– Invest ₹12,00,000 + ₹30,00,000 = ₹42,00,000
– Install 100 kW additional system
– Cover 70-80% of total electricity consumption
– Reduce maintenance charges by additional 30-40%
Result: Near-complete electricity independence by Year 10
Case Study 1: Urban Society – Mumbai
Profile: 600-unit society, 25-story towers, ₹18 lakh/year electricity cost
Challenge: High maintenance charges affecting affordability
Solution: 65 kW rooftop solar system on common areas
Results:
– Annual savings: ₹7.8 lakhs
– Payback period: 2.9 years
– Maintenance charge reduction: ₹155/unit/month (residents thrilled!)
– Property value increase: 2-3% premium noted in sales
– Community satisfaction: 94% residents approved Phase 2 expansion
– CO2 offset: 100+ tons/year (community pride)
Resident Testimonial: “Best decision our society made. Lower charges AND we feel good about contributing to clean energy.”
Case Study 2: Mid-Size Society with Battery Backup – Pune
Profile:350-unit society, 12-story buildings, frequent 2-3 hour blackouts
Challenge:Lifts non-functional during power cuts (safety concern)
Solution:40 kW solar + 30 kWh battery system for lift emergency backup
Results:
– Electricity cost reduction: 45%
– Blackout incident impact: Lifts operational during outages
– Safety improvement: Residents never stuck in lifts
– Monthly maintenance reduction: ₹85/unit (₹30,00,000/year)
– Emergency backup value: Prevented 4+ major incidents (worth ₹2-3 lakhs each)
– Enhanced property appeal: “Solar + backup power” marketing advantage
Investment Payback: 3.2 years (including avoided incident costs)
Case Study 3: Large Housing Complex – Bangalore
Profile: Multi-building campus, 1,500+ units, multiple amenities
Challenge: Total electricity cost ₹45+ lakhs/year, high maintenance
Solution: 200 kW distributed solar system across 4 buildings
Results (First Year):
– Annual savings: ₹24 lakhs
– Maintenance charge reduction: ₹400/unit/year
– Amenity expansion funded from savings (never possible before)
– New WiFi, upgraded CCTV funded from solar savings
– Property values increased 5% (solar as major selling point)
– Community engagement: 90%+ participation in energy awareness
Year 2-3 Expansion: Added battery storage and electric vehicle charging
| Aspect | Investment | Implementation | Governance |
|---|---|---|---|
|
Common Area Solar |
Centralized, economical |
Single approval process |
Democratic society decision |
|
Individual Unit
Solar |
Individual choice, higher cost per unit |
Each unit approves separately |
Individual
autonomy
|
|
Hybrid
Approach
|
Both available |
Phased
approach
|
Society +
Individual
choice |
Choose Common Area Solar if:
– Society has large terrace/common area roof
– Unified decision-making culture in society
– Desire to reduce maintenance charges for ALL residents
– Priority is democratic, fair benefit sharing
– Society is newer (less established individual installations)
Choose Individual Unit Solar if:
– Residents want independent energy control
– High-income residents seeking tax benefits
– Rooftop access available to individual units
– Residents willing to make individual investment
– Society has diverse financial capabilities
Choose Hybrid if:
– Society wants comprehensive coverage
– Financial diversity among residents
– Long-term energy independence goal
– Willing to implement in phases
| Service | Frequency | Covered Under |
|---|---|---|
|
Visual Inspection |
Quarterly |
Maintenance
contract |
|
Panel Cleaning |
Bi-annually (or as
needed)
|
Maintenance
contract
|
|
Inverter Service |
Annually |
Maintenance
contract |
|
Electrical Safety Check |
Annually |
Maintenance
contract
|
|
Annual Performance Audit |
Annually |
Maintenance
contract
|
|
Emergency Response |
As needed |
Support contract |
Annual Maintenance Cost:
– For 50 kW system: ₹20,000-30,000/year
– Typically covered from solar savings (small fraction of benefit)
– Emergency support available 24/7
Management Portal Features:
– Real-time generation monitoring (accessible to society management)
– Monthly savings tracking and reporting
– Performance alerts if underperformance detected
– Mobile app for instant notifications
– Annual reports with financial summaries
Support Team:
– Dedicated account manager for society
– Technical support hotline
– Long-WhatsApp support channel
– On-site visits for maintenance
– Emergency response within 24 hours
| Option | Details | Best For |
|---|---|---|
|
Bulk Bank Loan |
Society takes loan at
corporate rates
|
Established societies with credit |
|
Resident
Collections
|
Each resident contributes proportionally |
Cooperative minded communities |
|
Society
Reserves
|
Use accumulated society reserves |
Societies with adequate corpus
|
|
Vendor
Financing |
Equipment supplier provides EMI
|
Quick implementation |
|
Lease Model |
Third party invests; society gets lease income |
Zero capital societies |
Government Subsidy
– MNRE 30% subsidy
state incentives
– All societies eligible
Recommended Approach:
Total System Cost: ₹22,50,000
Less: MNRE Subsidy (30%): -₹3,00,000
Less: State Incentive: -₹1,50,000
NET SOCIETY COST: ₹18,00,000
Method: Mix of Society Reserve + Bank Loan
Society Reserve Contribution: ₹5,00,000
Bank Loan (7-year @ 9%): ₹13,00,000
Monthly EMI: ₹21,500
First Year Savings: ₹6,00,000
Minus EMI (12 months): –₹2,58,000
NET FIRST YEAR BENEFIT: ₹3,42,000
This surplus immediately improves society finances and reduces maintenance charges!
