  The purpose of this paper is to introduce a holistic and systematic approach,
based in key concepts of systems thinking, systems of systems and management
science; to completely represent, model and analyze microgrid systems. In this
paper we propose a Microgrid Reference Methodology (MRM) that guides the
cooperation and mutual benefits between electric utilities and industrial
customers for microgrid projects. We sketch a four-level socio-technical system
in which the {\delta} (business) level is added to the other three levels that
are traditionally analyzed in microgrid design and planning. This MRM clearly
specifies the steps and processes necessary for determining actors in the
system, their interrelations, interests, goals and undesired effects. Finally,
the MRM makes possible the evaluation of the impact of different alternatives
on the objectives of both parties through the determination of criteria and
factors. These factors can be influenced by the electric utility and customer;
or they can be external, but still influenced by other actors such as
regulators and government, to incentivize the implementation of microgrid
projects.
