For most of the history of California solar, exporting power to the grid was the whole point. Build big, run the meter backward, and let the utility settle up at the end of the year. That arrangement is gone, and a great deal of solar advice has not caught up with its absence.
Understanding what replaced it is the difference between a commercial system that performs as modeled and one that quietly underdelivers for twenty-five years.
What Changed
California has revised the rules for crediting customer-generated electricity three times. Each revision moved compensation further from the retail rate.
| Era | How Exports Were Credited | Why It Matters |
|---|---|---|
| NEM 1.0 (1996) | Essentially full retail value | A kilowatt-hour sent to the grid was worth the same as one you did not buy. Size had no downside. |
| NEM 2.0 (2016) | Largely retail, with Time-of-Use pricing and Non-Bypassable Charges | When you produced began to matter as much as how much. |
| Net Billing Tariff (April 2023) | Avoided-cost values set hourly, not retail | Exported energy is now worth a fraction of energy you consume yourself. Self-consumption becomes the entire game. |
The Net Billing Tariff sets a separate export value for every combination of month, hour, and weekday or weekend. The lowest of those values fall in the middle of sunny days, because that is precisely when California’s grid is most oversupplied with solar — and the middle of a sunny day is when your array produces most of its output.
That is the trap. The hours when an oversized system has surplus to sell are the same hours when surplus is worth least.
The Arithmetic of a Surplus Kilowatt-Hour
Consider two kilowatt-hours produced by the same array on the same afternoon.
The first is consumed inside the building. Its value is the full retail price of the electricity you did not have to buy — including the delivery charges, the surcharges, and every other component stacked onto a commercial rate.
The second has nowhere to go, because the building’s demand is already met. It flows out to the grid and is credited at that hour’s avoided-cost value.
Same panel. Same sunshine. Substantially different value. The only variable is whether the building had a use for it.
This is why our homepage puts it the way it does: by utilizing most or all of your solar production for your building’s needs, the Utility imposed 75% sell-back reduction is defeated.
The word that matters there is defeated. The reduction is not negotiated, appealed, or offset. It is made irrelevant, by never generating the surplus in the first place.
Why Commercial Buildings Are Well Positioned
The standard industry answer to the Net Billing Tariff is to add battery storage: capture the midday surplus, discharge it in the evening, and recover the difference. For a house, that reasoning is sound. A home’s demand arrives after sunset, so without storage the mismatch is unavoidable.
A commercial building generally does not have that mismatch. Refrigeration compressors, air conditioning, pumps, ovens, compressors and production equipment run during business hours. Business hours are daylight hours. The load curve and the production curve already overlap.
That means a commercial customer can reach very high self-consumption through sizing alone — no storage, no additional equipment, no second system to maintain. It requires only that the array be sized to the load rather than to the roof.
Storage remains worth revisiting as your operation changes or as its economics improve. It is simply not a prerequisite for a first system that performs well.
What This Means for Commercial Customers
Ask any solar proposal you receive a direct question: what portion of this system’s annual production does your model assume will be consumed on site, and what portion will be exported?
If the proposal cannot answer, it was sized to the roof. If it answers with a large export fraction and treats those exports as savings at retail value, the payback figure on its cover page is not achievable under current rules.
At Light Ray Electric we analyze interval usage data, utility rate schedules, building operating hours, and available roof area to identify the system size that delivers the strongest financial return. Rather than maximizing exports, our goal is to maximize the amount of solar energy consumed directly by your business.
Our Design Philosophy
We do not build systems that depend on selling electricity back to the utility. We never have, and under the Net Billing Tariff we are less inclined to than ever.
What we build are systems that reduce the bill — sized so that the power they make is power your building was going to buy anyway.
Request a free consultation and we will show you where that line falls for your facility.