Industrial Internet of Things (IIoT) is emerging as a new communication paradigm for a class of low-power wireless networks used in critical applications, such as industrial process monitoring and automation. While these networks are receiving significant attention from standardization bodies, a lightweight protocol stack, built on top of the Time Slotted Channel Hopping (TSCH) technology, is now available. IIoT devices are usually energy-constrained. Thus, the worldwide scientific community is spending a lot of efforts in designing new energy-saving communication protocols for TSCH-enabled networks. Nevertheless, even if the energy consumption is mainly due to radio communications, transmission of unneeded data, protocol overhead, and non-optimized communication patterns, the implementation of the IIoT protocol suite in real platforms may introduce a further and unpleasant waste of energy. The aim of this work is to experimentally measure the energy consumption of TSCHenabled platforms (specifically TelosB motes) under different system configurations. The two investigated operating systems are OpenWSN and Contiki. Obtained results will demonstrate that OpenWSN always registers a lower energy consumption, thus emerging as a promising protocol implementation for upcoming energy-efficient IIoT systems.