 isagen sa achieves leed gold isagen sa one of the largest producers and distributors of electricity in colombia has a new corporate headquarters located in medellin the building achieved a leed gold rating by the usgbc by deploying a number of building operation conservation measures including fixed and movable shading daylight harvesting occupancy sensors controlling lights and hvac elevator energy production rainwater collection additionally 96 of the waste and residue generated by the building s construction was recycled with the building itself using products with recycled material content including steel aluminum concrete drywall and wood enersim ltd performed the energy modeling for the project  