Do things cost energy to maintain?

[fatbooboo]

I just started playing again and I was wanting to know whether turrets,stations, units ,  everything that can be built cost energy to maintain?

[Toranth]

Yes, everything you build costs some amount of energy.  Unlike Metal, however, this is more of a continuous measure:  You have X total energy production, you have Y total energy consumption, and X is bigger than Y so everything operates.  You cannot save up energy to spend later, which means that if Y, your usage, is bigger than X, your production, you will start to have problems.