Digital Realty's 225 Megawatt Data Center

Earlier this month Digital Realty Trust told securities analysts that its top 15 properties had a total capacity of 733 megawatts of utility power - an average of nearly 49 megawatts per facility. The company provided additional detail in an SEC filing that included its latest investor presentation, itemizing the power capacity for each of those 15 sites. Nearly a third of that power capacity is found at a single data center campus in Northern Virginia.

Digital Realty (DLR) says its project on Devin Shafron Road in Ashburn has 225 megawatts of power capacity. The project, originally known as the Loudoun Exchange, currently has three buildings with a total square footage of 432,000 square feet. Digital Realty bought the site in March for $62.5 million. Forty percent of the existing space is leased by tenants including Amazon (AMZN), and the remainder is being developed over time. A Dominion Power substation is located adjacent to the property. The site plan by the original developer, Genisus, included plans for a second phase of three additional buildings totaling 318,000 square feet.

Digital Realty says for other properties have power capacity of 40 megawatts or more, including the huge Internet gateway building at 350 East Cermak Road in Chicago (100 megawatts) and a new facility in Piscataway, N.J. (44 megawatts). Here's the full list: