Our new office has gone green and it will make a huge difference. We now only have 1 active aircon that runs on batteries not mains - we also have some twirly-wirlies on the roof and a special cooling system that works with underground pipes and the twirly-wirleis. Works great as my sinus has cleared up.
We have also replaced all the geysers (2) with gas. We have two new sky lights that work awesome and supply enough light during the day. Also had high end CFL lights installed - price/quality makes a big difference.
We also have an array of "solar" batteries for backup. So next load shed we can continue working for 2 hours without having to start the generator.
But the end result is we have a more comfortable office. My sinus has improved majorly and we are all happy