  This paper presents a set of methods for estimating the renewable energy
generation downstream of a measurement device using real-world measurements.
First, we present a generation disaggregation scheme where the only information
available for estimation is the micro-synchrophasor measurements obtained at
the substation or feeder head. We then propose two strategies in which we use
measurements from the substation as well as a proxy solar irradiance
measurement. Using these two measurement points, we first propose a multiple
linear regression strategy, in which we estimate a relationship between the
measured reactive power and the load active power consumption, which are then
used in disaggregation. Finally, we expand this strategy to strategically
manage the reconstruction errors in the estimators. We simultaneously
disaggregate the solar generation and load. We show that it is possible to
disaggragate the generation of a 7.5 megawatt photovoltaic site with a
root-mean-squared error of approximately 450 kilowatts.
