Cecil Van Niekerk, Construction & Engineering Manager, Engen


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With the expected Eskom increases over the next five years, retail petroleum service stations are facing reduced profitability and some even closure as profits are continually eroded by rising operating costs. Electricity is one of the costs that can be managed and self generated.

This conference aims to examine best practices in energy efficiency and unpack the options and complexities of generating electricity from renewable energy specifically for retail fuel sites.

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Cecil Van Niekerk, Construction & Engineering Manager, Engen

  1. 1. Best Practises and Lessons learned fromGreen interventions at Engen servicestations in AfricaI
  2. 2. Agenda- IBD Green Road Map-Process followed-Interventions implemented-Rundu - the greenest service station site in Africa?-Next steps
  3. 3. IBD : Green Road MapUnderstand the greatest impacts- Start with Retail Service Stations- then depots and offices- Encourage our partners to participate…..Wimpy & CornerBakery- Go for the quick wins- Gain credibility and support for initiatives- Expand on successesGet the Dealers to buy-in- Before and after measurements- Prove the claims
  4. 4. Process followed-9 step process-Key areas- Behaviour and Procedure- Technology
  5. 5. Step 1 : Audit - Operational and Behavioural change- 15-20% savings possible- Identify Opportunities- Observe procedures e.g. opening- Influence and educate- Implement (Training manuals)Switch off when not in usePre-heating is 10 minsTurn off the lightReport leaks
  6. 6. Step 2 : Audit - Identify Power consumers- Prioritise interventions based on:- Contribution to site- Capex Cost and payback
  7. 7. Step 3 : Audit - Occupancy Audits- Measure:• When the lights are on• When the room is occupied- Result – 10-90% savings potential with Sensor control
  8. 8. Step 4 : Audit - Lux Audits• Are areas over lit?• Identify, redesign andchange light fittings• Consider:– OHS Act– Marketers needs– E.g. Wimpy 25% over lit
  9. 9. Step 5 : Design - Thermal Modelling• Optimise Building orientation for lowest thermal gain• Benefits:– Reduced demand on HVAC– Increased shade on shop fronts
  10. 10. Step 6 : Design - Challenge the current standards• Replace black ceilings with white for improved lightreflection• Use reflective paint on walls and ceilings……light & space• Soften the angle on the vertical bulkheads to deflect lightAngled bulkhead White ceiling
  11. 11. Step 7: Design - Value EngineeringAs a result of ongoing monitoring of Demand Profiles across sites- Site Power Infrastructure down graded:– From 250kVA to 100kVA (Target is 50 kVA)– Lighter supply cables– Generator downsized by 150kVA
  12. 12. Step 8: Our Partners - Wimpy and Corner Bakery• Agreement reached on reduction of lux levels• Scrapping of dropped ceilings and bulkheads so as not toblock out the daylight• CO2 and Humidity sensors on extract fans : instead ofoperating 24/7, fans now activated by grilling activity• Variable speed drives fitted to extractor fans• Motion sensors in stores and cold rooms• Move towards gas appliances where feasible• Investigating induction cookers• Access to training manuals• Staggered start
  13. 13. Step 9 : Roll out interventionsRoll out the interventions!
  14. 14. Interventions implemented-Pilot approach- Analyse opportunities- Research emerging technologies- Design solutions- Implement solutions- Measure results- Roll out success stories
  15. 15. 1) Measuring and Managing- On site remote metering• Pro-active Demand Management• Voltage Optimisation• Tariff Analysis• Invoice Verification• Carbon Footprint
  16. 16. 2) Day-light Harvesting- Lighting accounts for 22% of electricity costs- 90% saving during daylight hours- Ceilings have to be white for reflecting light- Under ceiling bulkheads need to tilt at 60 degreesto deflect light onto shelving
  17. 17. 3) Indirect Evaporative Cooling – Solar powered- AC Cooling accounts for 23% of Electricity costsPowered by PV panels (reverts to grid after hours)The saving is R 51,888 paRundu 1 Stop:C Conventional AC: 30 kVAIndirect Evap Cooling:2.1 kVA
  18. 18. 4) Reflective roof coating- AC Cooling 23% & Refrigeration 16% of Site- Reduces load on cooling
  19. 19. 5) LED Bi-Level Canopy Lighting with sensor• LED Canopy lights with a light and motion sensor• Proven saving of 90% versus the 400w metal halide
  20. 20. 6) LED Lighting Internally with lux and motion sensors• LED lighting throughout• Sensor automatically maintains lux levels• Motion sensors in stores and cold rooms switch offautomatically• No light switches in service areas* LED – Light Omitting Diodes
  21. 21. 7) Voltage Optimisation• Direct the mains supply via a voltage optimiser tapping the voltagedown to 216 - 222 range• Benefits:– Voltage spike protection– Power factor correction– Improved Harmonics– Reduced maintenance costs– Guarantees on projected savings– Only pay for 222 volts– Saving of 16%
  22. 22. 8) Hot Water – Solar• Benefits:– Grid independence– Reduced electricity costs
  23. 23. OR: Hot Water - Heat Pump• Benefits:– Hot water generated at a high co-efficient ofperformance– Water heated on demand– Not limited by sunlight
  24. 24. 9) Solar Roof Void Venting Fan• Benefits:– Air-conditioning units operate at lower capacity due tothe reduced heat in the roof void– Enhances the life of the Air-conditioning Equipment
  25. 25. 10) Isofoil Roof Insulation• Benefits:– Double the current insulation : Greater U Value– Eco-Friendly : made from recycled coke bottles
  26. 26. 11) Thermal Imaging• Use Infrared imagery to evaluate the air-tightness ofbuilding• Benefits:– Reduced demand on HVAC– Ensure proper installation by contractors– Identify areas to be improved at existing sites
  27. 27. 12) Window Films• Benefits:– Reduce solar gain through windows– Reduced sunlight on perishables– Staff comfort
  28. 28. 13) Water-wise fittings• Benefits:– Water savings : Waterless Urinals, Flapper-lessToilets, Aerated taps and low-flow shower fittings– 100% saving on urinals– 30% on others
  29. 29. 14) Site Water Harvesting• Rainwater harvesting• Benefits:– Free resource– Currently used for watering– Will be developed for toilet flushing
  30. 30. 15) On site power generation• 3kW PV array piloted to run air conditioning• 5 year < payback• Roll out where:• Grid unstable• Use of generator is significant (R4 per kWh)• Electricity Costs justify payback
  31. 31. Other Interventions implemented• Signage internals all LED• LED strip lighting in fridge doors• Trees for shading• Awareness: TV monitor indicating power usage andcarbon footprint• Food probe for refrigeration optimisationTV screen onthe bulkhead
  32. 32. Interventions in the pipeline• Wind turbines• Hot water heat recovery from AC• Integrated refrigeration• Automated Demand switching• On site vapour recovery
  33. 33. Rundu Namibia: Greenest site in Africa?• 32 interventions implemented
  34. 34. Rundu Namibia: Greenest site in Africa?
  35. 35. Consumption comparison
  36. 36. Consumption comparison
  37. 37. Next steps in the road map• Solar PV project roll out• Depot energy efficiency audits
  38. 38. Thank you