For Resident welfare association, low cost options include among others:
Replacing CFL and incandescent bulbs with LEDs. Light bulbs are used every day of the year so the savings are pretty significant. LED prices are cost effective and the slight premium paid to obtain a LED is recovered within less than a year! Typical common area lighting is on for atleast 10 hours. Check our calculator to see the savings potential with LEDs for your community. Link to Lighting Calculator
Install timers to automatically turn on and turn off lights
Consider Solar Powered Lighting for Garden, Walkways and other common area lighting areas like outdoor Parking Garage
Install an overhead tank overflow alarm system to save water and electricity. The added benefits are that the roof and walls are not damaged due to water overflow!
Consider solar power as primary source for common area services like CCTV, electric fencing and light posts for the community.