Reliability of Brazil’s grid (SIN)
Load interruptions and frequency, month by month, as published by ONS.
1.68 min
equivalent interruption duration (DREQ), 2026-08
24-month record: 15.99 (2024-10)
18
disturbances with load interruption, 2026-08
24-month record: 35 (2025-03 and 1 more)
0.0046 pu
energy not supplied (ENS), 2026-08
24-month record: 0.0436 (2024-10)
99.78 %
time with frequency within range (DFP), 2026-08
worst in 24 months: 99.54 % (2025-05)
SIN DREQ, minutes — last 24 months
SIN DREQ, minutes — last 24 months
0
5
10
15
20
2024-09: DREQ 1.05 min · FREQ 0.020 · ENS 0.0030 pu · 26 disturbances with load interruption · frequency within range 99.77% of the time 2024-09: DREQ 1.05 min · FREQ 0.020 · ENS 0.0030 pu · 26 disturbances with load interruption · frequency within range 99.77% of the time 09/24
2024-10: DREQ 15.99 min · FREQ 0.024 · ENS 0.0436 pu · 35 disturbances with load interruption · frequency within range 99.89% of the time 15.99
2024-10: DREQ 15.99 min · FREQ 0.024 · ENS 0.0436 pu · 35 disturbances with load interruption · frequency within range 99.89% of the time 2024-11: DREQ 0.59 min · FREQ 0.022 · ENS 0.0017 pu · 27 disturbances with load interruption · frequency within range 99.87% of the time 2024-11: DREQ 0.59 min · FREQ 0.022 · ENS 0.0017 pu · 27 disturbances with load interruption · frequency within range 99.87% of the time 2024-12: DREQ 0.30 min · FREQ 0.014 · ENS 0.0008 pu · 15 disturbances with load interruption · frequency within range 99.82% of the time 2024-12: DREQ 0.30 min · FREQ 0.014 · ENS 0.0008 pu · 15 disturbances with load interruption · frequency within range 99.82% of the time 12/24
2025-01: DREQ 1.55 min · FREQ 0.025 · ENS 0.0043 pu · 24 disturbances with load interruption · frequency within range 99.81% of the time 2025-01: DREQ 1.55 min · FREQ 0.025 · ENS 0.0043 pu · 24 disturbances with load interruption · frequency within range 99.81% of the time 2025-02: DREQ 1.53 min · FREQ 0.025 · ENS 0.0045 pu · 22 disturbances with load interruption · frequency within range 99.89% of the time 2025-02: DREQ 1.53 min · FREQ 0.025 · ENS 0.0045 pu · 22 disturbances with load interruption · frequency within range 99.89% of the time 2025-03: DREQ 3.86 min · FREQ 0.034 · ENS 0.0102 pu · 35 disturbances with load interruption · frequency within range 99.82% of the time 2025-03: DREQ 3.86 min · FREQ 0.034 · ENS 0.0102 pu · 35 disturbances with load interruption · frequency within range 99.82% of the time 03/25
2025-04: DREQ 2.40 min · FREQ 0.029 · ENS 0.0068 pu · 27 disturbances with load interruption · frequency within range 99.84% of the time 2025-04: DREQ 2.40 min · FREQ 0.029 · ENS 0.0068 pu · 27 disturbances with load interruption · frequency within range 99.84% of the time 2025-05: DREQ 0.53 min · FREQ 0.009 · ENS 0.0015 pu · 20 disturbances with load interruption · frequency within range 99.54% of the time 2025-05: DREQ 0.53 min · FREQ 0.009 · ENS 0.0015 pu · 20 disturbances with load interruption · frequency within range 99.54% of the time 2025-06: DREQ 0.15 min · FREQ 0.006 · ENS 0.0004 pu · 17 disturbances with load interruption · frequency within range 99.59% of the time 2025-06: DREQ 0.15 min · FREQ 0.006 · ENS 0.0004 pu · 17 disturbances with load interruption · frequency within range 99.59% of the time 06/25
2025-07: DREQ 0.63 min · FREQ 0.014 · ENS 0.0018 pu · 28 disturbances with load interruption · frequency within range 99.75% of the time 2025-07: DREQ 0.63 min · FREQ 0.014 · ENS 0.0018 pu · 28 disturbances with load interruption · frequency within range 99.75% of the time 2025-08: DREQ 1.14 min · FREQ 0.018 · ENS 0.0032 pu · 31 disturbances with load interruption · frequency within range 99.61% of the time 2025-08: DREQ 1.14 min · FREQ 0.018 · ENS 0.0032 pu · 31 disturbances with load interruption · frequency within range 99.61% of the time 2025-09: DREQ 0.71 min · FREQ 0.023 · ENS 0.0020 pu · 19 disturbances with load interruption · frequency within range 99.74% of the time 2025-09: DREQ 0.71 min · FREQ 0.023 · ENS 0.0020 pu · 19 disturbances with load interruption · frequency within range 99.74% of the time 09/25
2025-10: DREQ 3.97 min · FREQ 0.111 · ENS 0.0107 pu · 20 disturbances with load interruption · frequency within range 99.74% of the time 2025-10: DREQ 3.97 min · FREQ 0.111 · ENS 0.0107 pu · 20 disturbances with load interruption · frequency within range 99.74% of the time 2025-11: DREQ 0.28 min · FREQ 0.008 · ENS 0.0008 pu · 13 disturbances with load interruption · frequency within range 99.87% of the time 2025-11: DREQ 0.28 min · FREQ 0.008 · ENS 0.0008 pu · 13 disturbances with load interruption · frequency within range 99.87% of the time 2025-12: DREQ 0.35 min · FREQ 0.017 · ENS 0.0009 pu · 16 disturbances with load interruption · frequency within range 99.80% of the time 2025-12: DREQ 0.35 min · FREQ 0.017 · ENS 0.0009 pu · 16 disturbances with load interruption · frequency within range 99.80% of the time 12/25
2026-01: DREQ 0.14 min · FREQ 0.007 · ENS 0.0004 pu · 10 disturbances with load interruption · frequency within range 99.69% of the time 2026-01: DREQ 0.14 min · FREQ 0.007 · ENS 0.0004 pu · 10 disturbances with load interruption · frequency within range 99.69% of the time 2026-02: DREQ 0.48 min · FREQ 0.015 · ENS 0.0014 pu · 19 disturbances with load interruption · frequency within range 99.86% of the time 2026-02: DREQ 0.48 min · FREQ 0.015 · ENS 0.0014 pu · 19 disturbances with load interruption · frequency within range 99.86% of the time 2026-03: DREQ 0.33 min · FREQ 0.014 · ENS 0.0009 pu · 16 disturbances with load interruption · frequency within range 99.78% of the time 2026-03: DREQ 0.33 min · FREQ 0.014 · ENS 0.0009 pu · 16 disturbances with load interruption · frequency within range 99.78% of the time 03/26
2026-04: DREQ 1.28 min · FREQ 0.014 · ENS 0.0036 pu · 23 disturbances with load interruption · frequency within range 99.64% of the time 2026-04: DREQ 1.28 min · FREQ 0.014 · ENS 0.0036 pu · 23 disturbances with load interruption · frequency within range 99.64% of the time 2026-05: DREQ 0.42 min · FREQ 0.012 · ENS 0.0012 pu · 13 disturbances with load interruption · frequency within range 99.64% of the time 2026-05: DREQ 0.42 min · FREQ 0.012 · ENS 0.0012 pu · 13 disturbances with load interruption · frequency within range 99.64% of the time 2026-06: DREQ 0.31 min · FREQ 0.009 · ENS 0.0009 pu · 14 disturbances with load interruption · frequency within range 99.83% of the time 2026-06: DREQ 0.31 min · FREQ 0.009 · ENS 0.0009 pu · 14 disturbances with load interruption · frequency within range 99.83% of the time 06/26
2026-07: DREQ 0.55 min · FREQ 0.024 · ENS 0.0015 pu · 11 disturbances with load interruption · frequency within range 99.88% of the time 2026-07: DREQ 0.55 min · FREQ 0.024 · ENS 0.0015 pu · 11 disturbances with load interruption · frequency within range 99.88% of the time 2026-08: DREQ 1.68 min · FREQ 0.015 · ENS 0.0046 pu · 18 disturbances with load interruption · frequency within range 99.78% of the time 2026-08: DREQ 1.68 min · FREQ 0.015 · ENS 0.0046 pu · 18 disturbances with load interruption · frequency within range 99.78% of the time 08/26
worst month in the window
Worst month since 2007: 2009-11, with DREQ of 81.50 min.
Last 6 months
Month DREQ (min) FREQ ENS (pu) Disturbances DFP (%) 2026-08 1.68 0.015 0.0046 18 99.78 2026-07 0.55 0.024 0.0015 11 99.88 2026-06 0.31 0.009 0.0009 14 99.83 2026-05 0.42 0.012 0.0012 13 99.64 2026-04 1.28 0.014 0.0036 23 99.64 2026-03 0.33 0.014 0.0009 16 99.78
All 24 months
Month DREQ (min) FREQ ENS (pu) Disturbances DFP (%) 2026-08 1.68 0.015 0.0046 18 99.78 2026-07 0.55 0.024 0.0015 11 99.88 2026-06 0.31 0.009 0.0009 14 99.83 2026-05 0.42 0.012 0.0012 13 99.64 2026-04 1.28 0.014 0.0036 23 99.64 2026-03 0.33 0.014 0.0009 16 99.78 2026-02 0.48 0.015 0.0014 19 99.86 2026-01 0.14 0.007 0.0004 10 99.69 2025-12 0.35 0.017 0.0009 16 99.80 2025-11 0.28 0.008 0.0008 13 99.87 2025-10 3.97 0.111 0.0107 20 99.74 2025-09 0.71 0.023 0.0020 19 99.74 2025-08 1.14 0.018 0.0032 31 99.61 2025-07 0.63 0.014 0.0018 28 99.75 2025-06 0.15 0.006 0.0004 17 99.59 2025-05 0.53 0.009 0.0015 20 99.54 2025-04 2.40 0.029 0.0068 27 99.84 2025-03 3.86 0.034 0.0102 35 99.82 2025-02 1.53 0.025 0.0045 22 99.89 2025-01 1.55 0.025 0.0043 24 99.81 2024-12 0.30 0.014 0.0008 15 99.82 2024-11 0.59 0.022 0.0017 27 99.87 2024-10 15.99 0.024 0.0436 35 99.89 2024-09 1.05 0.020 0.0030 26 99.77
By subsystem, 2026-08
Subsystem DREQ (min) FREQ ENS (pu) Disturbances North 0.64 0.021 0.0017 3 Northeast 0.00 0.000 0.0000 0 Southeast/Center-West 0.65 0.020 0.0018 7 South 6.62 0.009 0.0202 9
Source: ONS open data (Grid Procedures, Submodules 9.1 and 9.7) · published through 2026-08 · loaded 2026-10-14 · measured 2026-10-15 01:58 BRT · data dictionaries: DREQ/FREQ · ENS · CIPER · DFP · download the data (JSON)