The facts are what they are. Voters approved to be automatically opted in to a program that will charge them more for electricity that is promised to be from a "green" portfolio administered by a government agency. It's purely a slight of hand that does not deliver what voters thought they were voting for.
Everyone, no matter what they sign up for, is receiving power from the interconnected (except for Texas) North American power grid. Every operational generation site pushes electricity through wires connected to every operational usage device. Generation must = load within a very small tolerance, otherwise things break. You have only one grid to choose from to get electricity. There's no special wire going from the green generation plant to plug into your house. The only thing that changes is you're being charged a special rate to the OCPA
So when OCPA buys power from it's carefully chosen (*cough* biggest donors and supporters *cough*) "green" generation sites, those "green" generation sites now have less generation capacity to sell to SCE. It was going to sell the "green" generation energy anyway, but instead of to SCE, now it's to OCPA.
It makes no difference to SCE because they always pay market rate for electricity whether it comes from nuclear, gas, solar, wind, or hydro, and pass that price on to the customer at cost (zero mark up) per law. SCE is generation source agnostic (in terms of price). It's mandate is to deliver power and maintain grid reliability. It's profit comes from a markup charged to users on the costs to maintain the grid, which they own, and that mark up amount is set annually by the California Public Utility Commission.
When you use SCE, you're paying market rate for electricity + cost plus a fixed mark up set by the government for SCE to transmit power to your house.
When you use the OCPA you're paying some negotiated rate for green electricity + OCPA administration + SCE (via OCPA) for the use of their local grid.
Nothing has changed in the overall portfolio of electricity generation with this new OCPA program. Users of OCPA are simply paying for an extra layer of administration +/- some negotiated rate for green electricity.
SCE users continue to pay market rates for electricity + transmission costs + a government set mark up on those transmission costs.
Time and time again voting to give more power (no pun intended) to the government proves to deliver deceit, corruption, inefficiency, and unintended consequences. Yet voters keep supporting measures like this because just maybe, this time will be different.