  The increasing penetration of renewable generation requires new tools to
achieve a high matching between demand and renewable generation at building and
community levels. Large commercial and public buildings with parking lots have
a considerable potential to provide energy flexibility by controlling the
charging of Electric Vehicles (EVs) and injecting part of the stored energy
into the building, using Building-to-Vehicle (B2V) and Vehicle-to-Building
(V2B) systems. However, EVs and buildings do not often belong to the same
entity and in Portugal the existing regulation does not allow financial
transactions between buildings and EVs as separate entities. Addressing this
regulation hurdle requires innovative optimization methods for the
implementation of B2V/V2B systems. Moreover, the new legislation regarding the
self-consumption of renewable generation in Portugal enables the trade of
renewable generation surplus between buildings and the establishment of
renewable energy communities. This paper intends to address this issue and
proposes a formulation to aggregate and manage the sharing of generation
surplus between buildings, using EVs as a flexibility resource. The simulation
results showcase the achieved increase in renewable self-consumption at
building and community levels, as well as the reduction in electricity costs.
