Abstract: A modular data center is collocated with a primary electric generating station and receives its operating power from connections upstream of any step-up transformer for transmission lines or grids. The data center itself comprises a building shell with a modular common power and cooling infrastructure to support data center containers brought in later by unrelated modular data center unit tenants. The heat and loads the data center containers each produce are isolated from the common areas and kept within the respective data center containers. The costs, maintenance, environmental, and security issues are therefore independent of the other modular data center unit tenants, and more easily managed, projected, and financed.