This report is the third release of the Smart Grid Laboratories Inventory. It presents aggregated information about the smart grid topics of research, the technologies, the standards and the infrastructure used by top organisations that hold smart grid activities at a laboratory level. Several categories of smart grid research have been identified and information is provided with respect to standards and sub-topics of research. It is an update with respect to previous releases with the scope to present the state-of-the-art on smart grid research and increase the sample of participants.