Introduction
U.S. solar manufacturing is entering a new phase of expansion, with cumulative photovoltaic manufacturing capital expenditure forecast to reach $12.2 billion by the end of 2026, according to a new analysis from Terawatt PV Research published September 22. The figure would represent more than half of all U.S. solar PV manufacturing spending recorded since 2001.
The timing is significant for another reason. Separate industry analysis shows that U.S. solar module production crossed 100 GW of cumulative output during the second quarter of 2026, marking a major milestone for domestic production.
The numbers point to something larger than a wave of factory announcements.
The U.S. solar industry is increasingly being measured by actual production, manufacturing investment, equipment deployment and supply-chain development rather than simply by the number of projects announced.
That shift is important because a factory only becomes strategically meaningful when it produces at scale.
Background and Context
For years, solar manufacturing in the United States has moved through cycles of factory construction, closures, technology changes and renewed investment.
The latest expansion has created a different manufacturing landscape.
Terawatt PV Research’s new Solar Manufacturing USA Quarterly report tracks individual U.S. manufacturing sites and breaks capital expenditure into buildings and infrastructure, production equipment, and maintenance or upgrades. The analysis covers production across the solar PV value chain and uses site-level information to distinguish announced capacity from manufacturing activity that is actually being developed or operated.
According to the report, U.S. solar PV manufacturing capital expenditure has exceeded $2.5 billion annually since 2023.
Investment reached a record $4.14 billion in 2024, with more than 60% of that year’s spending coming from First Solar and Qcells, according to the analysis.
The report says roughly 60% of 2023 to 2026 manufacturing spending went toward buildings and infrastructure, showing how much capital is required before production equipment even becomes the dominant expense.
This creates a crucial distinction between manufacturing capacity on paper and manufacturing output on the factory floor.
Latest Update or News Breakdown
U.S. solar manufacturing investment approaches $12.2 billion
The biggest number in today’s story is the $12.2 billion cumulative manufacturing capex forecast.
Terawatt PV Research estimates that U.S. solar PV manufacturing investment since the introduction of the 2022 Inflation Reduction Act will reach $12.2 billion by the end of 2026. The analysis says that spending represents more than half of all U.S. solar PV manufacturing investment since 2001.
The report does not simply count announced factories.
It examines manufacturing sites individually and tracks spending across construction, equipment and upgrades. That methodology is designed to provide a clearer picture of what is actually being built and operated.
This is increasingly important in an industry where announced gigawatts can differ substantially from operational production.
The United States has now produced 100 GW of solar modules
A separate analysis published September 21 found that cumulative U.S. solar PV module production reached 100 GW during Q2 2026.
The research, also conducted by Terawatt PV Research, covers U.S. module production dating back to the early 1970s and uses company and factory-level data.
More than 70% of the cumulative 100 GW figure was produced after the introduction of the Inflation Reduction Act in 2022, according to the analysis.
That does not mean every part of the solar supply chain has expanded at the same pace.
The next challenge is building a more integrated domestic chain that includes upstream materials, wafers, cells and modules.
Terawatt’s analysis says module production is currently much easier to track at the site level than upstream ingot, wafer and cell manufacturing, where the domestic ecosystem is still developing.
Texas is emerging as a major manufacturing hub
One of the most interesting geographical changes is happening in Texas.
Terawatt PV Research says Texas has become the leading U.S. state for solar module production in 2026, following the emergence of several manufacturers including Canadian Solar, Sirius/Elin, Imperial Star, SEG Solar, T1 Energy, TOYO/Abalance and Waaree Energies.
The report identifies additional manufacturing activity across the Southeast, including Louisiana, Florida, the Carolinas, Georgia and Alabama.
This creates several regional clusters rather than a single national manufacturing center.
For supply-chain companies, that geographic concentration can matter.
Manufacturers need access to transportation, electricity, industrial land, skilled workers, equipment suppliers and nearby customers.
Once multiple companies begin operating in the same region, the supporting ecosystem can become more efficient.
First Solar remains a major part of the U.S. story
First Solar continues to occupy an unusually important position in the domestic solar manufacturing landscape.
The factory-level analysis says almost two-fifths of cumulative U.S. module production can be attributed to First Solar.
The company’s long-standing U.S. manufacturing footprint gives it a position that newer entrants are trying to replicate.
At the same time, recent investment from companies such as Qcells and other manufacturers has expanded the number of participants in the domestic market.
The result is a manufacturing landscape that is becoming more diverse, even as a relatively small number of companies account for a large share of actual production.
Policy incentives remain part of the manufacturing equation
Federal policy has played a role in the economics of domestic manufacturing.
The IRS says the Section 45X Advanced Manufacturing Production Credit provides tax credits for qualifying components produced and sold in the United States, including certain solar components, inverters, battery components and critical minerals.
Current rules have also introduced restrictions involving prohibited foreign entities and material assistance from prohibited foreign entities. The IRS issued related guidance in 2026.
For manufacturers, this means the supply chain itself increasingly matters when evaluating the economics and eligibility of domestic production.
A solar module assembled in the United States is one part of the equation.
Where the cells, wafers, materials and other components originate can affect both cost and access to incentives.
Expert Insights or Analysis
The most important change in U.S. solar manufacturing may be the industry’s growing focus on production instead of announcements.
A factory announcement can generate headlines and investment expectations.
Actual production is harder to fake.
A functioning factory needs equipment that works, trained employees, raw materials, quality control, reliable power, logistics and customers.
That is why the new Terawatt analysis places so much emphasis on effective capacity, production output and capacity conversion rather than simply adding up announced gigawatts.
The distinction becomes especially important during a manufacturing boom.
A company can announce a 5 GW factory, but the commercial impact depends on how quickly that facility is constructed, equipped, commissioned and brought to consistent production.
The report says effective capacity-conversion rates can vary substantially during factory ramp-up, with early-stage facilities operating at much lower levels than mature manufacturing sites.
That creates a second challenge for U.S. solar manufacturing: ramping efficiently.
Building the factory is only step one.
The next step is making the production line work consistently.
Broader Implications
The growth of U.S. solar manufacturing could reshape the country’s broader clean-energy supply chain.
Solar modules are only one component of a much larger system.
The industry also requires:
- photovoltaic cells
- silicon
- wafers
- inverters
- glass
- frames
- electrical equipment
- mounting systems
- transformers
- storage systems
- logistics services
- industrial automation
- testing equipment
A larger domestic module industry can therefore create demand for a much wider manufacturing ecosystem.
But it can also expose gaps.
If module factories expand faster than domestic upstream suppliers, manufacturers may continue depending on imported inputs.
Terawatt’s analysis specifically points to the need for a more balanced silicon-based value chain as the United States expands production.
That is where the supply-chain story becomes more interesting than the headline investment figure.
The question is no longer simply how many solar factories America can build.
It is how much of the complete manufacturing chain can operate domestically and competitively.
For more coverage of advanced manufacturing, energy technology and supply-chain transformation, see The Tech Marketer.
Related History or Comparable Technologies
The U.S. solar manufacturing industry has been through several distinct eras.
Early American companies helped establish commercial photovoltaic manufacturing decades ago. The industry later experienced periods of consolidation and intense competition from overseas producers.
The current buildout is different in scale and structure.
The new investment wave is creating large manufacturing facilities while also encouraging development across multiple parts of the supply chain.
The 100 GW cumulative U.S. module production milestone provides useful historical context because it includes more than five decades of domestic manufacturing activity.
Yet the distribution of that production has changed dramatically over time.
The current generation of factories is increasingly focused on high-volume automated production and vertically integrated supply chains.
The same pattern can be seen in other strategic industries.
Semiconductors require fabs, equipment manufacturers, chemical suppliers and packaging operations.
Automotive manufacturing depends on component suppliers, logistics networks and specialized labor.
Battery production requires materials processing, cell manufacturing, pack assembly and energy-storage integration.
Solar manufacturing is moving toward a similar ecosystem model.
What Happens Next
The next phase of U.S. solar manufacturing will be measured less by factory announcements and more by production data.
Terawatt PV Research plans to update its analysis quarterly, with the first quarterly deliverable scheduled for October 2026 after Q3 data is completed.
That should provide a clearer picture of how quickly new facilities are moving from construction to production.
Several developments will be worth watching.
1. Cell and wafer production
The United States has made significant progress in module manufacturing, but upstream production remains an important gap.
Greater domestic cell, wafer and ingot capacity would make the supply chain more integrated.
2. Factory utilization
The industry will need to demonstrate that newly constructed facilities can achieve reliable production at commercially meaningful volumes.
3. Regional supply chains
Texas and the Southeast are emerging as important manufacturing regions. The development of local supplier networks around those factories could determine how durable the expansion becomes.
4. Policy and supply-chain rules
Manufacturers will continue tracking federal tax-credit rules and restrictions related to foreign entities and supply-chain content. The IRS has already issued 2026 guidance affecting Section 45X eligibility.
5. Actual production versus announced capacity
This may become the industry’s most important metric.
The next stage of U.S. solar manufacturing will increasingly be judged by what factories produce rather than what companies say they intend to produce.
Conclusion
The U.S. solar manufacturing industry is entering 2026’s final quarter with two numbers that capture the scale of the transformation.
Cumulative U.S. solar PV manufacturing capital expenditure is forecast to reach $12.2 billion by the end of the year, while cumulative domestic module production has already crossed 100 GW.
But the bigger story is underneath those numbers.
America is building a larger solar manufacturing base across Texas, the Southeast and other regions, while companies invest in factories, equipment and production capacity.
The next challenge is integrating that manufacturing base.
More domestic modules require more domestic cells, wafers, materials, equipment, logistics and supporting industries if the country wants a deeper end-to-end solar supply chain.
That makes 2026 less about whether U.S. solar manufacturing is expanding and more about whether the new factories can translate billions of dollars in investment into sustained, competitive production.
The factories are being built.
Now the supply chain has to catch up.
FAQ
What is happening with U.S. solar manufacturing in 2026?
U.S. solar manufacturing investment is expanding rapidly. Terawatt PV Research forecasts cumulative U.S. solar PV manufacturing capital expenditure to reach $12.2 billion by the end of 2026.
How much is the U.S. investing in solar manufacturing?
Cumulative U.S. solar PV manufacturing capex is forecast at $12.2 billion by the end of 2026, according to Terawatt PV Research’s new factory-level analysis.
Has U.S. solar module production reached 100 GW?
Yes. Terawatt PV Research’s factory-level analysis says cumulative U.S. solar PV module production crossed 100 GW during Q2 2026.
Which U.S. state is becoming a major solar manufacturing hub?
Texas has emerged as the leading U.S. state for solar module production in 2026, according to Terawatt PV Research. Several manufacturers are contributing to the state’s production base.
What is the biggest challenge for U.S. solar manufacturing?
One major challenge is developing a complete domestic supply chain. Module production has expanded, but upstream areas such as ingots, wafers and cells need further development for a more integrated manufacturing ecosystem.
What is the 45X manufacturing tax credit?
Section 45X is a federal Advanced Manufacturing Production Credit covering qualifying components produced and sold in the United States. Eligible categories include certain solar components, inverters, battery components and critical minerals.
Why is actual production more important than announced capacity?
A factory announcement does not necessarily mean a facility is producing at commercial scale. Production data shows whether equipment has been installed, commissioned and operated successfully, making it a more direct measure of manufacturing activity.
Sources & References
- “IRA-stimulated U.S. solar manufacturing capex to reach $12.2 billion by end 2026,” pv magazine USA, September 22, 2026
Read the full pv magazine USA report - “U.S. solar module production reaches historic 100 GW landmark,” pv magazine USA, September 21, 2026
Read the 100 GW production report - “U.S. solar capacity nears 300 GW, enough to power 50 million homes,” pv magazine, September 22, 2026
Read the U.S. solar capacity report - “Advanced Manufacturing Production Credit,” Internal Revenue Service
Read the IRS guidance - “Treasury, IRS provide guidance for certain energy tax credits regarding material assistance provided by prohibited foreign entities,” Internal Revenue Service, February 12, 2026
Read the IRS guidance on supply-chain restrictions
