So that's the bad news for SCE and PWP residential customers, but what about commercial customers? Well for businesses operating under SCE's GS-1 and GS-2 rates, your bad news starts now.
GS-1 and GS-2 Explained
SCE's commercial customers (what it refers to as general service, hence the "GS") are largely divided into two groups: those that pay only for monthly energy usage (GS-1) and those that pay for both usage and peak power demand charges (GS-2). You can use all the energy you want in a month, but as long as your peak power demand never exceeds 20 kW you will stay in GS-1. Once your demand sneaks past 20 kW however, you will be consigned to paying higher bills under GS-2.
Solar for GS-1 customers is a no brainer, just as it now is for SCE's residential customers. For GS-2 customers, however, the question is a tougher call since it can be very hard to know how well solar will coincide with a potential client's peak power demands, and it is those demand charges that so drive the pain of GS-2 bills. Neither GS-1 nor GS-2 are tiered, meaning that every kWh of energy is charged the same. Under GS-2, however, demand charges are significantly higher during the summer than they are the rest of the year.
We have a cool simulator (based on the old rates) that shows how your actual usage drives the difference between GS-1 and GS-2 rates.
To try this for yourself, click on the image above to go to the visualization page.
We said that you could use all of the energy you like and remain in GS-1 but that's not strictly true—if your peak power demand stays below 20 kW you can only pull so much energy into your site. Let's imagine a commercial entity that is right under that limit: say 19 kW peak demand and they sustain that demand for 10 hours a day, every day. The remaining 14 hours their demand drops to just 5 kW. Their daily usage averages:
Usage = 10*19 + 14*5 = 190 + 70 = 260 kWh/day.
Under the old rate, this maxed-out GS-1 customer would have seen a bill of $15,355 or roughly 16.2¢/kWh. (A bargain, by the way, compared to what a residential customer using that much energy would have paid.)
Under the new rate, their bill jumps to $16,777 an increase of 9.26%, and now they are paying 17.7¢/kWh.
We recently provided a proposal to a potential GS-2 client, so we will model their usage to demonstrate what the new rates will do to a GS-2 customer's bill. Their usage has peak demands that average 119 kW per year, but spike as high as 167 kW during the summer. Their daily energy usage is substantial as well, ranging between 600 and nearly 1,000 kWh per day from winter to summer.
Under the old rates, they were paying some $56,873 or 21.73¢/kWh. The new rates will see their bill climb to $59,598, and increase of 4.79%, averaging 22.77¢/kWh.
But here's the interesting thing about the new GS-2 rate: it is actually more beneficial to solar customers, since the increase is mostly in the per kWh charge. Indeed, when we model our potential client's savings in Year 1 under the new rate as compared to the old, it increases by over $1,000—going from $14,808 to $15,818, a 6.8% savings increase for no additional out-of-pocket expense! Their payback now occurs in Year 6 instead of Year 7, their IRR increases from 12.2% to 12.9% and they will have saved an additional $12,000 in Year 10 than they would have under the old rates. (Combine the solar power system with intelligent storage and you are really on to something.)
SCE's rates are going up for all classes of customers that we see: residential (12%+), small commercial (9%), and large commercial (4.8%). Solar can help all of these customer classes, and GS-2 customers can see an even greater savings from solar under the new rates than they could before. Oh, and SCE still has some rebate money for commercial projects, but that won't last for long.
Stop suffering, start saving—make this the Summer you go solar.