Product Revenue was ESS Tech’s largest product and service line in fiscal 2025, bringing in $3.09M of $4.75M (65%).
| Product and Service | FY 2022 | FY 2023 | FY 2024 | FY 2025 |
|---|---|---|---|---|
| Product Revenue | $2.41M | $15.31M | $14.39M | $3.09M |
| Other Revenue | — | $6.76M | $4.10M | $1.33M |
| Service Revenue | $273.00K | $549.00K | $396.00K | $324.00K |
| Total | $2.68M | $22.62M | $18.89M | $4.75M |
ESS Tech brought in $4.75M from its three product and service lines in fiscal 2025, the year ended December 31, 2025. That was down 74.9% from $18.89M in fiscal 2024. Product Revenue was the largest at $3.09M (65.1%), ahead of Other Revenue at $1.33M (28.0%) and Service Revenue at $324.00K (6.8%).
Compared with fiscal 2024, every line above 2% of revenue shrank. Service Revenue held up best, down 18.2% to $324.00K, and Product Revenue fell the most, down 78.5% to $3.09M.
ESS Tech began breaking out Other Revenue in fiscal 2023, when it brought in $6.76M.
Customer C was ESS Tech’s largest revenue line in fiscal 2025, bringing in $7.02M of $4.74M (148%).
| Concentration Risk Benchmark | FY 2025 |
|---|---|
| Customer C | $7.02M |
| Customer B | $2.39M |
| Customer A | -$4.67M |
| Total | $4.74M |
ESS Tech brought in $4.74M from its three revenue lines in fiscal 2025, the year ended December 31, 2025. Customer C was the largest at $7.02M (148.3%), ahead of Customer B at $2.39M (50.3%).
The total is net of Customer A, which took $4.67M off revenue in fiscal 2025.
Related Party was ESS Tech’s largest revenue line in fiscal 2025, bringing in $7.14M of $4.75M (150%).
| Related and Nonrelated Parties | FY 2022 | FY 2023 | FY 2024 | FY 2025 |
|---|---|---|---|---|
| Nonrelated Party | $1.83M | $22.61M | $17.14M | -$2.39M |
| Related Party | $852.00K | $108.00K | $1.75M | $7.14M |
| Total | $2.68M | $22.72M | $18.89M | $4.75M |
ESS Tech brought in $4.75M from its two revenue lines in fiscal 2025, the year ended December 31, 2025. That was down 74.9% from $18.89M in fiscal 2024. Related Party was the largest at $7.14M (150.3%).
From fiscal 2022 to 2025, combined revenue from these revenue lines grew from $2.68M to $4.75M, 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 $2.39M off revenue in fiscal 2025.
ESS Tech (GWH) reports its revenue by product and service, by concentration risk benchmark and by related and nonrelated parties. In fiscal 2025, Product Revenue was its largest product and service line, bringing in $3.09M (65.1% of the total), followed by Other Revenue at $1.33M (28.0%).
Product Revenue was ESS Tech's largest product and service line in fiscal 2025, bringing in $3.09M, or 65.1% of the $4.75M total across its three product and service lines.
Customer C was ESS Tech's largest revenue line in fiscal 2025, bringing in $7.02M, or 148.3% of the $4.74M 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.