Product Revenue was ESS Tech’s largest product and service line in fiscal 2025, bringing in $1.03M of $1.58M (65%).
| Product and Service | FY 2022 | FY 2023 | FY 2024 | FY 2025 |
|---|---|---|---|---|
| Product Revenue | $803.00K | $5.10M | $4.80M | $1.03M |
| Other Revenue | — | $2.25M | $1.37M | $444.00K |
| Service Revenue | $91.00K | $183.00K | $132.00K | $108.00K |
| Total | $894.00K | $7.54M | $6.30M | $1.58M |
ESS Tech brought in $1.58M from its three product and service lines in fiscal 2025, the year ended December 31, 2025. That was down 74.9% from $6.30M in fiscal 2024. Product Revenue was the largest at $1.03M (65.1%), ahead of Other Revenue at $444.00K (28.0%) and Service Revenue at $108.00K (6.8%).
Compared with fiscal 2024, every line above 2% of revenue shrank. Service Revenue held up best, down 18.2% to $108.00K, and Product Revenue fell the most, down 78.5% to $1.03M.
ESS Tech began breaking out Other Revenue in fiscal 2023, when it brought in $2.25M.
Customer C was ESS Tech’s largest revenue line in fiscal 2025, bringing in $2.34M of $1.58M (148%).
| Customer | FY 2025 |
|---|---|
| Customer C | $2.34M |
| Customer B | $795.00K |
| Customer A | -$1.56M |
| Total | $1.58M |
ESS Tech brought in $1.58M from its three revenue lines in fiscal 2025, the year ended December 31, 2025. Customer C was the largest at $2.34M (148.3%), ahead of Customer B at $795.00K (50.3%).
The total is net of Customer A, which took $1.56M off revenue in fiscal 2025.
Related Party was ESS Tech’s largest revenue line in fiscal 2025, bringing in $2.38M of $1.58M (150%).
| Related and Nonrelated Parties | FY 2022 | FY 2023 | FY 2024 | FY 2025 |
|---|---|---|---|---|
| Nonrelated Party | $610.00K | $7.54M | $5.71M | -$796.00K |
| Related Party | $284.00K | $3.00K | $583.00K | $2.38M |
| Total | $894.00K | $7.54M | $6.30M | $1.58M |
ESS Tech brought in $1.58M from its two revenue lines in fiscal 2025, the year ended December 31, 2025. That was down 74.9% from $6.30M in fiscal 2024. Related Party was the largest at $2.38M (150.3%).
From fiscal 2022 to 2025, combined revenue from these revenue lines grew from $894.00K to $1.58M, a compound annual growth rate of 21.0%. Related Party's share of the total rose from 31.8% to 150.3%.
The total is net of Nonrelated Party, which took $796.00K off revenue in fiscal 2025.
ESS Tech (GWHT) reports its revenue by product and service, by customer and by related and nonrelated parties. In fiscal 2025, Product Revenue was its largest product and service line, bringing in $1.03M (65.1% of the total), followed by Other Revenue at $444.00K (28.0%).
Product Revenue was ESS Tech's largest product and service line in fiscal 2025, bringing in $1.03M, or 65.1% of the $1.58M total across its three product and service lines.
Customer C was ESS Tech's largest revenue line in fiscal 2025, bringing in $2.34M, or 148.3% of the $1.58M total across its three revenue lines.
Every figure comes from ESS Tech's annual financial filings, as reported. Each line keeps the name ESS Tech gives it, and years follow its fiscal calendar.
ESS Tech's revenue by product and service goes back to fiscal 2022, with figures through fiscal 2025. The latest four fiscal years are free to view, and the full history is available with a Business Quant subscription.