How many employees work at ESO?
Electricity System Operator EAD has approximately 718 total employees worldwide as of March 2026, according to Revelio Labs workforce intelligence data. ESO's total headcount has grown 3.0% from 697 employees in 2023 to 718 in 2026.
Data source: Revelio LabsCoverage: Global workforce, 2023–2026Published July 2026
About ESO's Workforce
Electricity System Operator EAD is an Energy and Resources company based in Sofia, Bulgaria, founded in 2007. It employs 718 people as of March 2026 and sits as the 7th-largest by headcount among its peers.
ESO's workforce has grown 3.0% from 2023 to 2026, though it is down 0.7% year over year in 2026. The headcount declined to a low of 687 in 2023 Q3 before recovering, and the distribution of employees is highly concentrated in Bulgaria (98.2%), with Morocco (0.6%) and Liberia (0.5%) also represented; Morocco is its fastest-growing location.
ESO's largest groups by function are Engineering (49.2%), Finance and Operations (36.8%), and Sales and Marketing (14.0%), with Finance and Operations growing fastest at 0.9% over the period. The average tenure is 7.2 years, and the average salary is $23,772, with the highest regional median noted in Eastern Europe at $21,000 and regional medians ranging from $14,000 to $29,000. Overall sentiment is positive and flat in direction.
ESO sits at a rate of $23,772 on average across its global workforce, and its geographic footprint remains overwhelmingly Bulgaria-centric, reinforcing its uniquely concentrated workforce distribution.
Sourced from Revelio Labs workforce data.
As of March 2026
ESO
workforce metrics
Headcount
718
0.7% YoY
Avg. Salary
$23.8k
1.1% YoY
Tenure
7.2yr
0.2yr YoY
Growth Rate
-0.7%
0.9pts YoY
Hiring Rate
Attrition Rate
Unlock hiring rate, attrition rate, and 12 additional workforce metrics for ESO. Compare to peers, export the dataset, and access the full quarterly history.
- ESO had 718 employees in 2026, a 0.7% decline (+3) from 2025.
- ESO had 717 employees in 2025, a 0% no change (+8) from 2024.
- ESO had 709 employees in 2024, a 0.5% decline (+16) from 2023.
- ESO had 693 employees in 2023, a 0.6% increase (+16) from 2022.
ESO's total workforce has grown from 697 employees in 2023 to 718 in 2026.
Electricity System Operator EAD — quarterly employee count (2023–2026)
| Year | Qtr | Employees | YoY Change | YoY % |
|---|---|---|---|---|
| 2026 | Q1 | 718 | +3 | -0.7% |
| 2025 | Q4 | 717 | +8 | +0.0% |
| 2025 | Q3 | 730 | +28 | +1.4% |
| 2025 | Q2 | 720 | +20 | +0.6% |
| 2025 | Q1 | 715 | +21 | +0.2% |
| 2024 | Q4 | 709 | +16 | -0.5% |
| 2024 | Q3 | 702 | +15 | -0.8% |
| 2024 | Q2 | 700 | +3 | -0.2% |
| 2024 | Q1 | 694 | +10 | +0.7% |
| 2023 | Q4 | 693 | +16 | +0.6% |
| 2023 | Q3 | 687 | +27 | +1.7% |
| 2023 | Q2 | 697 | +31 | +1.3% |
Want to see ESO's complete headcount history back to 2008, including quarterly breakdowns?
Bulgaria accounts for the largest share of ESO's global workforce with approximately 98% of total employees, followed by Morocco and Liberia.
ESO employees by country — 2026
| Country | Employees | % of Total | YoY % |
|---|---|---|---|
| Bulgaria | 698 | 98.2% | -0.2% |
| Morocco | 4 | 0.6% | +0.0% |
| Liberia | 4 | 0.5% | +0.0% |
| Poland | 3 | 0.4% | +0.0% |
| Latvia | 2 | 0.2% | +0.0% |
| Canada | 0 | 0.1% | -90.9% |
Drill into city-level data, hiring trends by region and historic geographic shifts
ESO's largest employee groups are Engineering (49.2%), Finance and Operations (36.8%), and Sales and Marketing (14.0%).
ESO employees by department — 2026
| Department | Employees | % of Total | YoY % |
|---|---|---|---|
| Engineering | 350 | 49.2% | -0.1% |
| Finance and Operations | 262 | 36.8% | +0.9% |
| Sales and Marketing | 99 | 14.0% | -3.7% |
Compare ESO's department mix to industry peers.
ESO's average employee salary is $23,772 globally. Employees in Eastern Europe receive the highest compensation.
ESO median employee salary by region — 2026 (USD)
| Region | Median Salary |
|---|---|
| Eastern Europe | $21,000 |
Unlock salary by role, level, and city — and compare to ESO's industry peers.
Revelio Labs tracks employee sentiment across ESO's workforce based on public professional data. Overall sentiment is positive and has held steady year over year in 2026.
Overall
Unlock the full sentiment breakdown by department, tenure, and trend over time.
Similar Energy and Resources Companies by Employee Count
- How fast is ESO growing?
- In 2026, ESO's headcount shrank 0.7% to 718 employees, up from 715 in 2025.
- Where are ESO employees located?
- Most ESO employees are based in Bulgaria (98.2% of headcount), followed by Morocco and Liberia.
- What is the average salary at ESO?
- The average employee salary at ESO is approximately $23.8k per year.
- When was ESO founded and where is it headquartered?
- ESO was founded in 2007 and is headquartered in Sofia, Bulgaria.
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