Reactive Power Penalty — In Brief
A reactive power penalty is an additional charge added to the electricity bill of facilities in Turkey whose cosφ value falls below 0.98, under the conditions set by EPDK. Inductive (motor, transformer, ballast) and capacitive (overcompensation) reactive consumption are monitored separately. When the ratio of inductive reactive consumption to active consumption exceeds 20%, and when the capacitive reactive consumption ratio exceeds 15%, the penalty is automatically billed. The penalty can reach 10–30% of the annual bill total. A properly designed compensation panel eliminates this penalty completely.
What Is Reactive Power?
There are three types of power in the electrical grid:
- Active Power (P) — kW: Power that does useful work (the motor turns, produces heat)
- Reactive Power (Q) — kVAR: Power that creates a magnetic field and does no work
- Apparent Power (S) — kVA: Vector sum of active + reactive (S² = P² + Q²)
Power Factor (cosφ) = P / S
| cosφ | Interpretation |
|---|---|
| 1.00 | Perfect (purely resistive load) |
| 0.98-1.00 | Target band (no penalty) |
| 0.95-0.98 | Inductive warning band |
| < 0.90 | High penalty risk |
| Negative (capacitive) | Overcompensation, capacitive penalty |
2026 Tariff Structure (EPDK)
Limits
- Inductive reactive / Active ratio: ≤ 20% → no penalty
- Capacitive reactive / Active ratio: ≤ 15% → no penalty
- If both inductive and capacitive occur in the same period, both are calculated separately
Penalty Formula
Inductive Penalty = (Q_inductive - 0.20 × P_active) × Reactive Unit Price
Capacitive Penalty = (Q_capacitive - 0.15 × P_active) × Reactive Unit Price
Estimated reactive unit price for 2026 (industrial):
- Inductive: ~1.40 TL/kVARh
- Capacitive: ~1.60 TL/kVARh
(Actual prices are taken from the tariff cards published by EPDK.)
Sample Calculation 1: Small Workshop
Facility’s Monthly Data:
- Active consumption (P): 12,000 kWh
- Inductive reactive consumption (Q_end): 4,500 kVARh
- Capacitive reactive consumption (Q_cap): 0 kVARh
Calculation:
- Inductive limit = 0.20 × 12,000 = 2,400 kVARh
- Inductive subject to penalty = 4,500 − 2,400 = 2,100 kVARh
- Inductive penalty = 2,100 × 1.40 = 2,940 TL/month
- Annual penalty = 2,940 × 12 = 35,280 TL/year
Compensation investment: 40 kVAR panel ≈ 75,000 TL
Payback period: 75,000 / 35,280 ≈ 25.5 months (~2 years)
Sample Calculation 2: Medium-Scale Factory
Facility Data:
- Active consumption: 180,000 kWh/month
- Inductive reactive: 65,000 kVARh
- Capacitive reactive: 8,000 kVARh
Calculation:
-
Inductive limit = 0.20 × 180,000 = 36,000 kVARh
-
Inductive subject to penalty = 65,000 − 36,000 = 29,000 kVARh
-
Inductive penalty = 29,000 × 1.40 = 40,600 TL/month
-
Capacitive limit = 0.15 × 180,000 = 27,000 kVARh
-
Capacitive consumption 8,000 kVARh → below the limit, no penalty
Inductive penalty only, annual = 40,600 × 12 = 487,200 TL
Compensation investment: 200 kVAR detuned panel ≈ 280,000 TL
Payback period: ~7 months
Excel Template (Manual Calculation)
Prepare a simple Excel template with the columns below:
| Month | P (kWh) | Q_end (kVARh) | Q_cap (kVARh) | Ind. Limit | Cap. Limit | Ind. Penalty | Cap. Penalty | Total |
|---|---|---|---|---|---|---|---|---|
| January | 12000 | 4500 | 0 | 2400 | 1800 | 2940 | 0 | 2940 |
| February | 11500 | 4300 | 0 | 2300 | 1725 | 2800 | 0 | 2800 |
| March | 13200 | 5000 | 200 | 2640 | 1980 | 3304 | 0 | 3304 |
| ... |
Formulas:
- Ind. Limit = P × 0.20
- Cap. Limit = P × 0.15
- Ind. Penalty = MAX(0, (Q_end − Ind.Limit) × 1.40)
- Cap. Penalty = MAX(0, (Q_cap − Cap.Limit) × 1.60)
- Total = Ind. Penalty + Cap. Penalty
How to Read Data from Your Bill
Look for these items on the bill:
- "Active Energy" or "Active Draw" → P (kWh)
- "Reactive Energy" or "Inductive Reactive" → Q_inductive (kVARh)
- "Capacitive Reactive" or "Reactive Delivery" → Q_capacitive (kVARh)
- "Reactive Consumption Charge" → The penalty you are currently paying
Ways to Avoid the Penalty
- Install a compensation panel (most effective solution)
- Do not shift to the capacitive side (overcompensation mistake)
- Correct capacity calculation (neither insufficient nor excessive)
- Detuned (reactor-equipped) system — to protect against harmonics
- Periodic maintenance — a burnt capacitor restarts the penalty
- Use a soft starter / VFD (cosφ is naturally high)
- Adaptive response to load changes with an intelligent controller
Compensation Capacity Calculation
Required capacitor capacity:
Q_compensate = P × (tan(φ1) − tan(φ2))
- P: Active power (kW)
- φ1: Current cosφ angle
- φ2: Target cosφ angle (generally 1.00 → 0°)
Example: P = 500 kW, current cosφ = 0.75 (φ1 = 41.4°)
- tan(41.4°) = 0.882
- Target cosφ = 1.00 → tan(0°) = 0
- Q_compensate = 500 × (0.882 − 0) = 441 kVAR
- Safety factor (10%) → 485 kVAR recommended
DOA Enerji Compensation Solutions
DOA Enerji offers, as a package, free energy analysis (7-day TRMS measurement) + accurate capacity calculation + manufacturing and commissioning of detuned/classic compensation panels. A payback period under 18 months is guaranteed; otherwise, the difference is refunded.
Frequently Asked Questions
Is there reactive consumption on residential bills?
No. Reactive consumption is not measured under the residential tariff and no penalty is applied. It is only valid for commercial and industrial tariffs.
Is compensation mandatory in a new building?
It is not mandatory under the EPDK tariff, but it is strongly recommended due to its economic benefit. In the 2026 tariff, the inductive unit price is around 1.40 TL/kVARh.
Why should cosφ be brought closer to 1.00?
Small fluctuations in the 0.98 target band can lead to penalties. When operating with a 1.00 target, fluctuations remain within the band and you pass without penalty. Still, the controller must be precisely set to avoid moving into capacitive operation.
Is the reactive penalty applied retroactively for the past 12 months?
No, it is calculated and billed separately each month. No refunds or corrections are made for past months. You will see a penalty-free bill starting from the month after compensation is installed.
Can I object to TEDAŞ for an incorrect cosφ calculation?
Yes, you can apply to EPDK regarding meter accuracy. The objection is justified if the meter seal is broken or in case of a CT/VT failure. During the objection process, a report from an independent accredited laboratory is required.