The group that stopped the solar installation was something called "Save Our Mesa":
> But a group of residents organized as “Save Our Mesa” argued such a large installation would be an eyesore and could curtail the area’s popular recreational activities — biking, ATVs and skydiving — and deter tourists from visiting sculptor Michael Heizer’s land installation, “Double Negative.”
The group itself is not in any way an environmental group, they claim to be locals who want to save their tourism industry.
Their own website: http://www.saveourmesa.org
> The majority of our community’s revenue comes from tourism. We lost a lot of tourism and businesses when the shrinking lake levels of Lake Mead occurred closing a nearby beach. We have struggled but built back our economy through OHV tourism. When people come and camp/hotel for a week, they buy our gas, our groceries, eat in our restaurants, use our mechanics and parts stores. This allows these businesses to thrive thus keeping us self sufficient. Feedback from many of our Snowbirds was that they would look for new places to go, that’s lost revenue. People would not come to recreate, that’s lost revenue.