Most “state of solar” reports are about money and megawatts. Engineering teams need a different question answered: what does the data change about the drawings we produce next quarter?
This Q2 2026 edition uses only public data from the International Energy Agency (IEA), the Solar Energy Industries Association (SEIA) with Wood Mackenzie, and India’s Ministry of New and Renewable Energy (MNRE). We ran no survey and we publish no internal statistics.
Quick answer. The state of solar engineering in 2026 is high volume under tighter rules. The US installed 11.4 GWdc in Q2 2026, mostly utility-scale, ahead of tax credit deadlines. India reached 168.04 GW of solar by 31 August 2026 and began enforcing ALMM List-II for cells on 1 June. The 2026 NEC edition is published but adopted state by state. Design teams face more storage, more documentation, and stricter equipment sourcing.
TL;DR
- IEA expects global solar additions to slow slightly in 2026 after a record near 600 GW in 2025.
- US Q2 2026 installs were 11.4 GWdc, up 45% year on year, led by utility-scale.
- US residential and community solar fell year on year. Commercial grew.
- India added 17.78 GW of solar from April to August 2026 and now has 168.04 GW.
- Code and sourcing rules, not demand, drive most engineering rework this year.
This report is for heads of engineering, design managers, and EPC owners in the US and India. For India-only market detail, read our India solar market 2026 outlook.
What does the global data say about solar in 2026?
The IEA’s Renewables 2025 report, published in October 2025, is the latest full forecast.
| IEA figure | Value |
|---|---|
| Solar added in 2025 | Nearing 600 GW |
| 2026 to 2028 | Slight slowdown from 2025 levels, linked to policy changes in China and the US |
| 2029 | Over 600 GW |
| 2030 | Approaching 700 GW |
| Renewables added 2025 to 2030 | About 4.6 TW, with solar about 80% |
| US solar to 2030 | About 140 GW less than the previous forecast |
Figures as summarized by pv magazine (October 2025). A flat global year still means hundreds of gigawatts of design work. The mix shifts between countries and segments.
What happened in the US solar market in Q2 2026?
The SEIA and Wood Mackenzie US Solar Market Insight Q3 2026, released in September 2026, covers Q2 installations.
| Segment | Q2 2026 installed | Change vs Q2 2025 |
|---|---|---|
| Utility-scale | 9.6 GWdc | +61% |
| Commercial | 638 MWdc | +11% |
| Residential | 995 MWdc | -12% |
| Community solar | 231 MWdc | -14% |
| Total | 11.4 GWdc | +45% |
Solar’s share of new US generating capacity fell from 51% in 2025 to 45% in the first half of 2026, according to pv magazine USA. The previous quarter was weak: Q1 2026 installs were 7.8 GWdc, down 27% year on year, per the June edition.
What drove the utility-scale jump?
SEIA links the strong quarter to developers bringing projects online ahead of tax credit deadlines.
Under the One Big Beautiful Bill Act of 2025, wind and solar projects must begin construction by 4 July 2026, or be placed in service by the end of 2027, to keep the Section 45Y and 48E credits. IRS guidance on beginning of construction is in Notice 2025-42, which has since faced litigation.
For engineering teams, that means a backlog of safe-harbored projects that still need design, permits, and interconnection. Tax treatment is a question for your tax adviser, not your designer.
Why is residential down?
The residential clean energy credit under Section 25D ended for expenditures after 31 December 2025. Wood Mackenzie expected the residential market to shrink in 2026 in its June edition. Storage attachment is rising, which adds work to every residential permit set. Our US residential permit trends for 2026 covers what that means for plan sets.
What changed in US codes this year?
NFPA issued the 2026 edition of the National Electrical Code (NEC, NFPA 70) in 2025. See the NFPA 70 page for the current edition.
The code is published, but it is not law until a state or local authority adopts it. Many jurisdictions still enforce NEC 2020 or 2023. Plan sets must cite the edition the authority having jurisdiction (AHJ) actually enforces.
Our guides cover the detail:
- NEC 2026 changes for solar designers
- Which NEC edition each state enforces
- NEC 690.12 rapid shutdown compliance
What is the state of solar engineering in India in 2026?
MNRE’s physical progress report shows 168.04 GW of solar on 31 August 2026. India added 17.78 GW from April to August 2026, after a record 44.61 GW in FY 2025-26.
Three engineering changes stand out.
- Cell sourcing. ALMM List-II for solar cells applies from 1 June 2026. Net-metering and open access projects have an exemption until 31 December 2026. See our ALMM List-II deadline guide.
- Distributed volume. Distributed solar was 16.3 GW of FY 2025-26 additions, per MNRE. Rooftop and PM-KUSUM work needs fast, repeatable design and CEIG and DISCOM paperwork.
- Grid and storage. Transmission and curtailment limits push storage into more tenders. Our analysis of whether India’s solar surge is outpacing its grid covers the constraints.
What do these trends mean for design teams?
This table turns the data into engineering consequences. It is our reading of the public figures, not a forecast.
| Trend (source) | Engineering consequence | What to change now |
|---|---|---|
| US utility-scale surge before credit deadlines (SEIA) | Compressed schedules on large ground mount projects | Lock design basis early; avoid late equipment swaps |
| US residential decline with more storage (SEIA) | Fewer but more complex residential permit sets | Template battery and backup sections of the plan set |
| NEC 2026 adoption varies (NFPA, state adoption) | Mixed code editions across a portfolio | Track the edition per AHJ in every project file |
| ALMM List-II in force (MNRE) | BOQ and module choice tied to commissioning date | Keep layouts flexible on module size until purchase |
| India distributed growth (MNRE) | High volume of small projects | Standardize rooftop drawings and DISCOM document sets |
| Storage in more tenders (MNRE, IEA) | Hybrid design becomes routine | Build BESS sizing into bid-stage design |
The common thread is documentation. More rules mean more checks per drawing set. Teams that standardize templates and review steps absorb the load better than teams that add headcount.
What should engineering leaders watch in Q3 and Q4 2026?
- SEIA/Wood Mackenzie Q4 2026 edition for Q3 US installs and any post-deadline drop.
- Tax credit litigation and IRS guidance that may change project timing.
- MNRE monthly updates for India additions and further ALMM orders.
- State NEC adoption notices in your active US markets.
- IEA Renewables 2026 for revised global forecasts, when published.
We will update this report when the next data set is out.
How Heaven Designs fits in
We provide outsourced design and engineering for US permit sets and Indian EPC projects. Relevant services include US solar permit design, ground mount solar design, and electrical CEIG drawings for India.
We design to the code edition and documents each project requires. We do not guarantee AHJ, utility, or DISCOM approval.
FAQ
How much solar did the US install in Q2 2026?
11.4 GWdc, up 45% from Q2 2025, according to SEIA and Wood Mackenzie. Utility-scale was 9.6 GWdc of that.
How much solar capacity does India have in 2026?
168.04 GW on 31 August 2026, according to MNRE.
Is NEC 2026 in force?
It is published. Each state or local authority decides when to adopt it, so check the AHJ.
Where does this report get its data?
Only from public sources: IEA, SEIA and Wood Mackenzie, MNRE, NFPA, and the IRS. We did not run a survey.
Next step
If code changes, sourcing rules, or volume are stretching your design team, get a project quote or download design samples to check our deliverables first.
Data checked against the linked sources on 6 October 2026. Next update: after the SEIA/Wood Mackenzie Q4 2026 release.