The spectral power generator is extremely cheap but extremely fragile. It produce the same. You can built the module over it but it will retain some of it fragility.
As soon as I introduced it in NRS, it became obvious that there is no reason to pay for extra HP for the generator during the opening. The spectral generator became the favourite of anyone. In fact, it's the only building I recommend to build as default in NRS.
Having your entire power generation collapse, at the tiniest attack seem to everyone a good price to pay for a quicker opening.
I suggest 2 solutions :
1) Implement the spectral gens as an alternative.
2) Reduce the construction cost and the HP of the normal power gen (we all prefer that)