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Thirty-eight percent of EBCE's Bright Choice power mix originates from "Unspecified Sources of Power". The California Energy Commission refers to unspecified sources of power as "electricity that is not traceable to a specific generating facility, such as electricity traded through open market transactions. Unspecified sources of power are typically a mix of all resource types and may include renewables." Bright Choice receives unspecified power from the Asset Controlling Supplier, BC Hydro System, which procures large hydroelectric energy. Of Bright Choice's 705,638 Megawatt hours (MWh) of unspecified sources of power, BC Hydro System generates 535,768 MWh (29%), and the other 9% comes from other unspecified sources. This means Bright Choice's carbon -free makeup is really significantly greater than 85%, as explained in more detail later in this section. Large hydropower has its pros and cons. One potential issue with such a bulk of EBCE's energy portfolio relying on large hydropower is the possibility of drought. A drought can affect electricity generation, which ultimately can cause a fluctuation in supply and price. Unbundled Renewable Energy Certificates (RECs) are a type of electricity source energy providers can purchase. Unbundled RECs allow for CCAs or IOUs to purchase the credit for renewable energy, without actually purchasing the renewable energy itself. Unbundled RECs give utilities the credit, but they are not actually injecting renewable energy onto the grid. This is one way to comply with the state's Renewable Portfolio Standards, albeit a controversial way. Currently, California's RPS allows electricity providers to use up to 10% unbundled RECs in their portfolio. EBCE's own rule in its JPA document limits the CCA to no more than half of the unbundled RECs allowed in California's RPS program. This means EBCE's energy portfolio can include a maximum of 5% unbundled RECs. EBCE is currently below this threshold and less than 2% of EBCE's load is from unbundled RECs. California's RPS requires an electricity procurer's energy portfolio to contain at least 50% renewable energy by 2030, with an interim target of 33% renewable by 2020. The basic packages from the following CCAs have different renewable energy mixes: MCE, 61 %; Silicon Valley Clean Energy, 54%; Peninsula Clean Energy, 50%; and CleanPowerSF, 48%. EBCE's Bright Choice and Brilliant 100 programs are 38% and 40% renewable, respectively. While EBCE has already exceeded the 2020 interim target of 33%, it lags behind the other Bay Area CCAs. However, they have the potential to increase their renewable energy percentages with their new Power Purchasing Agreements (PPAs). Alternatively, PG&E's 2018 electric power generation mix is 86% carbon -free, with 39% coming from renewable energy sources. PG&E's electric renewable energy mix comes from a mix of mostly solar and wind, with smaller amounts of biomass/biowaste, geothermal, and small hydroelectric energies. PG&E's 2018 standard electricity mix would appear to derive slightly more energy from renewable sources than EBCE's Bright Choice. In addition, PG&E has improved its renewable and carbon -free portfolio by six percentage points from 2017 to 2018. Similar to EBCE and all the other CCAs in Page 10 of 20