The spec includes details for the 48V power shelves, tool-less service access, "vanity-free" cases, recycled components, battery backups and high-efficiency rectifiers that convert AC to DC power. The entire system, Google says, has been perfected over the years in cooperation with its partners. (Though not part of the Open Rack proposal, the search giant builds its own computing hardware using off-the-shelf parts from Qualcomm and others, rather than leaning on standalone switches from the likes of Cisco.)

Google says its Open Rack 2.0 is "ready-to-use" for companies that want to transition to more efficient servers. It's pitching the project to the OCP community at a conference next week, and industry players including Microsoft, Intel, Facebook and IBM will vote to accept it. If that goes as planned, Open Rack 2.0 will form part of the OCP spec and others manufacturers will be urged to adopt it.