Record Solar Growth Keeps Falling First: Why First Solar and TCO Thinking Matter

I coordinate emergency deliveries and last-minute fixes for utility-scale solar and storage projects. In my role, when something is about to miss a deadline, I’m the one on the phone at 9 p.m. looking for a solution. I have handled more than 200 rush orders in the last eight years, including same-day turnarounds for module deliveries and commissioning support after a supplier missed its window. Most of those emergencies were not caused by weather. They were caused by someone comparing quotes by first cost instead of total cost.

Here is my opinion: The record solar growth keeps falling first in procurement reviews because too many buyers still focus on first cost instead of total cost of ownership. The lowest $/W quote can be the most expensive solar panel you ever buy. The same logic applies to batteries, inverters, and EV charging stations.

The price per watt is not the price of energy

Global solar deployment is already at record levels. According to the IEA, about 375 GW was added in 2023. But a record capacity number doesn't tell you whether those assets will still be profitable in year 25. If a module degrades faster than promised, or a supplier delivers late, the energy yield falls and the schedule cost rises. That is where the TCO equation matters.

In 2023, I watched a 250 MW project approve a module supplier based on upfront price. I won't name the vendor, but by the time late deliveries, weather delays, re-sequencing, and overtime were added, the project had spent more than the supposed savings. That is not an abstract risk; it is a line item on someone's budget that doesn't appear on the vendor's quote.

This is why I ask for more than a spec sheet. First Solar's Series 6 Plus 460W and Series 7 modules, for example, are built around thin-film CdTe technology. They don't always win a headline efficiency comparison. But their annual degradation rate of less than 0.5% means more energy over the life of a plant. At utility scale, a few tenths of a percent of degradation can represent millions of dollars in revenue across a 30-year power purchase agreement.

First Solar's backlog—around 66 GW as of its early 2025 investor updates—is another part of the story. A large, contracted backlog is not a vanity metric. It signals supply chain visibility, manufacturing planning, and customer commitments. When I'm triaging a project, supplier reliability is worth more than an attractive $/W number.

Solar history and the pace of change

Whenever someone asks when was the first solar panel invented, the usual answer is Charles Fritts's selenium cell in 1883, or the Bell Labs silicon panel in 1954. Those are both true in their own way. But the more useful history is about bankability: when did solar become something a lender could underwrite with confidence?

The record solar growth keeps falling first not because demand is weak—it isn't. It falls first in priority when budgets are reviewed without a TCO lens. We have gone from a scientific curiosity to multi-gigawatt factories in about a century. The question now is whether we are building projects smart enough to last.

Batteries follow the same logic

Storage is where I see the cheapest-first delusion most often. Take a LiFePO4 battery 100Ah. In Q4 2024, a decent 12V lithium iron phosphate battery with a good BMS cost roughly $700 to $900. A comparable lead-acid AGM battery might be $200 to $250. If you compare only sticker prices, the AGM looks like the sensible purchase.

But compare cost per cycle. A LiFePO4 battery 100Ah is usually rated for 4,000 to 6,000 cycles; an AGM may only deliver 500 to 1,000 cycles before its capacity becomes unusable. The lithium battery's cost per cycle is lower. Add the time spent replacing, disposing of, and reinstalling lead-acid batteries, and the cheap option is anything but.

There is also the voltage question. People search what voltage to charge LiFePO4 battery because it matters. A 12V LiFePO4 battery typically needs a bulk and absorption voltage around 14.2 to 14.6V, then a drop to a resting voltage near 13.6V or lower. Some manufacturers recommend no float at all. If you use a lead-acid profile at 14.8V, the BMS may disconnect or you can reduce battery life. I have seen a battery bank die because the charger settings were wrong. The battery wasn't bad—the interface was. That's a TCO problem hiding in an installation detail.

EV charger installation in Katy, TX: a real-world TCO test

When I'm triaging a rush order for an EV charger installation in Katy TX, I don't ask who is the cheapest. I ask what can go wrong and when we would know. The same principle applies to solar module procurement.

Say one contractor quotes $850 and another quotes $1,150. The first quote may not include the permit, the load calculation, the conduit, or the panel upgrade. The second quote might be all-in and can schedule a crew within 72 hours. If the project is tied to a fleet launch or an inspection date, the $850 quote can become $1,400 after resubmits and re-inspection. The $1,150 quote is cheaper. This is exactly why I now calculate TCO before comparing any vendor quotes.

But aren't all modules the same?

I hear that objection a lot: they all make electrons, so why pay extra for a brand? I believed that in 2019. After the past few years, I have refined my thinking—or rather, I have changed it. Modules are similar only if you ignore degradation rates, temperature coefficients, supplier delivery behavior, and warranty service. Same MW does not mean same kWh.

I'm not arguing that thin-film CdTe is always better than crystalline silicon. That would be absurd. In some climates and financing scenarios, a c-Si module will have the lower TCO. My point is narrower: evaluate that. Don't assume it. And don't let a record-breaking industry headline become an excuse to stop looking at the real cost.

The bottom line

It took me years and more than 200 procurement decisions to understand that the cheapest quote is rarely the lowest-cost solution. I still kick myself for approving a vendor switch in 2021 to save $0.005/W. That decision ended up costing us far more in schedule disruption, and the lesson still guides how I review every solar module, battery, and EV charging contract.

Total cost of ownership should include:

• Module or battery price, delivered
• Degradation and expected lifetime
• Balance-of-system compatibility
• Installation and labor complexity
• Permitting, inspection, and delays
• Supplier reliability and warranty support
• Cost of failure if the schedule slips

The solar industry's record growth is real. If that record keeps falling first in favor of upfront savings, we will build more capacity but worse assets. The winners in utility-scale solar won't be the ones who bought the cheapest hardware. They will be the ones who calculated the true cost over the life of the asset—and then made the disciplined choice to pay for performance.