Since reptilians are evil, they decided to enslave humans to generate their power for them. The humans turn a generator to create energy. The only cost is food and water. If you have too many human slaves they could revolt and destroy many buildings in the process. After revolutions you lose resources, all of your slave population, and buildings. Reptilian citizens often get mad after revolts and you may need to use a stimulus package.
or that just can be the LIS or the human who have "steal" the building and some reptilian enginer to learn how you build that and learn what does that need but the tec will be also expansive