For large (>5 MW) data center applications, it is common to have large generator power plants connected directly to the medium voltage (MV) electrical distribution network. The principal way to cost optimize the system is to reduce the number of generators installed using N+1 redundancy instead of 2N. This paper introduces some optimized electrical distribution architectures for the generator power plant that meets the various Uptime Institute Tier levels. A cost comparison study and reliability calculations were made on a representative case study. The results are presented in this paper. Recommendations for choosing an architecture based on the expected performance of the system are also provided.