This report is the fourth release of the Smart Grid Laboratories Inventory. It presents aggregated information about smart grid research topics and shows the tendencies of the research community. It shows information about the technologies used and also gives more detailed information for specific areas, like standards and infrastructure used by the participant organizations. Numerous smart grid laboratories have been contacted for this scope and information has been gathered about their research activities. In this release, we have joined forces under the EIRIE platform, and we obtained an updated database containing information in coherence with the ETIP SNET (European Technology and Innovation Platforms Smart Networks for Energy Transition) concept. This release is not only an update with respect to the previous ones, but it shows information in coherence with similar European incentives, thus helping the scientific community to comprehend better the state-of-the-art technologies.