A solar power conversion device embedded security module creates trusted metering data in relation to power generated and outputs it as metering data. The security module might be constructed as an IC card using semiconductor chip fabrication and assembly techniques integral with the solar power conversion device. The device might include more than one solar cell mounted on a panel to form an array. There may be a panel management module for collating data, e.g., from multiple cells, prior to transmission over a network via the metering output. The panel management module might include a subscriber identity module and the metering data output may provide associated mobile telephone endpoint technology so that the metering data can be transmitted over an air interface.