  Transactive microgrids are emerging as a transformative solution for the
problems faced by distribution system operators due to an increase in the use
of distributed energy resources and a rapid acceleration in renewable energy
generation, such as wind and solar power. Distributed ledgers have recently
found widespread interest in this domain due to their ability to provide
transactional integrity across decentralized computing nodes. However, the
existing state of the art has not focused on the privacy preservation
requirement of these energy systems -- the transaction level data can provide
much greater insights into a prosumer's behavior compared to smart meter data.
There are specific safety requirements in transactive microgrids to ensure the
stability of the grid and to control the load. To fulfil these requirements,
the distribution system operator needs transaction information from the grid,
which poses a further challenge to the privacy-goals. This problem is made
worse by requirement for off-blockchain communication in these networks. In
this paper, we extend a recently developed trading workflow called PETra and
describe our solution for communication and transactional anonymity.
