A report released earlier this year by the Union of Concerned Scientists tweaked the IID for lackluster adoption of renewables until 2010, but the utility maintains that report was based on outdated information.

The IID has indeed been developing its renewable portfolio aggressively, promoting photovoltaic development on former agricultural land and signing contracts with local sources of geothermal and biomass power as well. Biomass is the single largest source of IID's renewable power, at just under 10% of the utility's supply.

California's RPS law requires publically-owned utilities to average 20 percent in renewable energy sources between 2011 and 2013. That increases to 25 percent by 2016 and 33 percent by 2020. IID is forecasting it will reach the 20% mark this year, reaching 30% in 2013.

The third largest public power provider in California, IID serves approximately 146,000 customers in Imperial County and parts of Riverside and San Diego counties.

ReWire is dedicated to covering renewable energy in California. Keep in touch by liking us on Facebook, and help shape our editorial direction by taking this quick survey here.