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Energy usage in Apartment Complexes and ways of reducing this energy usage using sustainable methods.


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Ms Sumedha Malaviya from World Resources Institute spoke about energy usage in Apartment Complexes and ways of reducing this energy usage using sustainable methods. She also presented simple ways in which electricity costs can be brought down for common area energy consumption.

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Energy usage in Apartment Complexes and ways of reducing this energy usage using sustainable methods.

  1. 1. Energy efficiency interventions for common areas of apartment complexes
  2. 2. ABOUT WORLD RESOURCES INSTITUTE INDIA WRI India is a research organization that turns big ideas into action at the nexus of environment, economic opportunity and human well-
  3. 3. TIDE is a Bangalore based NGO, providing technology solutions to meet societal needs. TIDE and WRII are running a successful electricity conservation program VidyutRakshaka. ABOUT TIDE
  4. 4. ENERGY USE IN APARTMENT COMPLEXES Source: BEE Design guidelines for energy efficient multistorey residential buildings for hot and dry and composite climates • Common area electricity bills accounted for in monthly/annual maintenance charges • Major opportunities to save energy and implement renewable energy and reduce emissions • Potential market opportunities
  5. 5. STUDY OF ENERGY USE IN APARTMENT COMPLEXES IN BANGALORE 1 Understand energy use in common areas and energy savings potential 2 Reduce energy demand through energy efficiency measures 3 Meet portion of reduced energy demand through RE 4 Facilitate engagement with service providers and vendors on EE and RE projects
  6. 6. SCOPE AND METHODOLOGY Scope • 10 apartment complexes and 4700 flats • 4.7 MW total sanctioned load • 5.5 million units- annual electricity consumption in common areas Methodology • Walkthrough assessments • Collection of electricity bills (3 years) • Examination of DG logs • Energy audit of pumps • Data analysis • Identification of EE and RE interventions • Customized recommendation reports
  8. 8. KEY FINDINGS- GENERAL OBSERVATIONS • Excess sanctioned loads • Electricity costs account for 15-25% of annual maintenance charges • Lack of systematic maintenance of electricity bills • Absence of standard procedures for monitoring energy or water use • Presence of analog electricity meters in some apartment complexes • Absence of sub-metering of any kind (e.g. water flow meters) • Unit cost of electricity generated from DG set ranged from 9 to 22 INR/kWh • Functional RWH and STPs in some places
  10. 10. KEY FINDINGS Common area service Lighting Common area lighting comprises entirely of LEDs (4/10). Some have occupancy sensors Old, inefficient tube lights and bulbs; LED lights kept on through the day and no occupancy sensors Pumping Automatic water level controllers installed with pumps; good maintenance in some complexes Leakages, improper sizing of pumps, multiple rewinding of motors; very old pumps (>10 years) DG set Digital meter DG sets; Annual Preventive Maintenance (AMCs) for DGs Poor or no DG logs; poor ventilation of DG rooms Lifts/elevators AMCs Lift lights without automatic controllers
  11. 11. RECOMMENDED BEST PRACTICES Communicate Awareness and capacity building of RWA members, residents, supervisors and ground personnel; simple toolkits and guides to instill best practices Upgrades and retrofits Use BEE star rated pumps and LEDs; ensure proper sizing and location lights and pumps; auto sensors and controllers O&M AMC for pump sets; maintenance of major electrical assets, DG loading studies and maintenance of DG logs
  12. 12. TOTAL ENERGY SAVINGS POTENTIAL Recommendation Average projected annual monetary savings as a percentage of annual electricity cost Surrendering excess sanctioned load 6% to 10% Replacing lighting systems with energy efficient lights 5% to 10% Occupancy sensors in elevators 2% to 5% Diesel generator • Maintenance of DG logs • Dry run fuel consumption • Optimal loading of DGs Could not be estimated due to lack of baseline data Pump performance study 10-30% Total savings for 10 apartment complexes 23% to 55%
  13. 13. EXAMPLE OF ONE APARTMENT COMPLEX- ECONOMICS Recommendations Area / utility Annual savings possible (INR) Surrender the excess sanctioned load Panel Room 15, 984 Surrender the unused meter connections Panel room 16, 500 Replacement of T12 tube lights with T5 tube lights Basement 93, 574 Replacement of halogen lamps with LED floodlights 6132 Auto – controller in Elevator for lighting 1,17, 208 Total indicative annual savings INR 2,49, 398 8% of the annual electricity cost
  14. 14. WAY FORWARD Potential market opportunities – Annual Maintenance contracts only for pumps – Energy Service Companies providing end to end solutions – Solar PV for meeting a part of common area energy loads (10 to 30% depending on area available) Next steps for WRII and TIDE – Energy needs assessment survey- deep-dive convening on EE- RE implementation in October/November 2018 – Further assess feasibility of demand aggregation and possible business models – Energy management booklet for apartment complexes
  15. 15. THANK YOU We thank MacArthur Foundation for their support! Contact- • Sumedha Malaviya- • Sumathy Krishnan- k.sumathy@tide-