Portugal · island electricity system · AzoresTerceira
Terceira: an isolated power system run by EDA, with no cable to other islands or to the mainland. Figures are annual, from official documents, each with its reporting period.
Latest official data Real-time electricity data is not currently published through a verified public source. The values shown are the latest available official data.
| By source | MWh | share |
|---|---|---|
| Thermal (fuel oil, diesel) | 114,768 | 62.2 % |
| Geothermal | 23,742 | 12.9 % |
| Hydro | 1,629 | 0.9 % |
| Wind | 30,748 | 16.7 % |
| Solar PV | 71 | 0.0 % |
| Waste (CVE) | 13,651 | 7.4 % |
Reporting period: 2020 [source]
| 2019 | 2020 | 2021 | 2022 | 2023 | |
|---|---|---|---|---|---|
| Energy delivered to the grid | 187.6 | 184.6 | 193.1 | 195.6 | 196.6 |
| Annual peak load | 32.7 | 32.2 | 32.6 | 33.5 | 33.2 |
Billed consumption per island is not published: EDA gives it only for the region. Energy delivered to the grid is consumption plus losses, from EDA's management report. We do not estimate them.
Reporting period: 2023 · 2019–2023 [source]
No cable links the islands to each other or to the mainland: each one generates everything it uses. Click an island to open its page.
Actual, at 2020-12
| Thermal (fuel oil, diesel) | 58.1 |
| Geothermal | 4.7 |
| Hydro | 1.4 |
| Wind | 12.6 |
| Waste (CVE) | 2.6 |
| Total | 79.4 |
Reporting period: 2020-12 [source]
Planned for 2024-12: investment plan, NOT achieved
| Thermal (fuel oil, diesel) | 68.5 |
| Geothermal | 4.7 |
| Hydro | 1.4 |
| Wind | 12.6 |
| Solar PV | 2.0 |
| Waste (CVE) | 2.6 |
| Total | 91.8 |
Reporting period: 2024-12 · forecast [source]
Capacity at generator level in EDA's plants. The right-hand column is the 2022–2024 investment plan as approved; it does not say what was built.
Continuity indicators from the annex of EDA's annual quality-of-service report, by quality zone (A = large towns, B = medium, C = rural). An island with several zones has no single published indicator; 2025 includes exceptional events.
SAIFI: interruptions per customer per year
| 2021 | 2022 | 2023 | 2024 | 2025 | |
|---|---|---|---|---|---|
| Zone A | 3.9 | 6.8 | 3.1 | 2.8 | 3.5 |
| Zone B | 17.5 | 9.1 | 10.1 | 5.8 | 6.7 |
| Zone C | 21.3 | 17.8 | 19.4 | 20.6 | 19.1 |
SAIDI: time without supply per customer per year (h:mm)
| 2021 | 2022 | 2023 | 2024 | 2025 | |
|---|---|---|---|---|---|
| Zone A | 1:02 | 2:14 | 1:27 | 0:25 | 1:01 |
| Zone B | 2:24 | 2:17 | 2:42 | 1:07 | 5:24 |
| Zone C | 2:54 | 4:52 | 5:18 | 1:47 | 4:02 |
Number of customer interruptions (all causes)
| 2021 | 2022 | 2023 | 2024 | 2025 | |
|---|---|---|---|---|---|
| Customer interruptions | 360,995 | 307,167 | 314,494 | 313,729 | 301,167 |
Reporting period: 2025 · years 2021–2025 [source]
Contracted power (€/day)
| 3.45 kVA | 0.1929 |
| 4.6 kVA | 0.2520 |
| 5.75 kVA | 0.3083 |
| 6.9 kVA | 0.3665 |
| 10.35 kVA | 0.5394 |
| 13.8 kVA | 0.7122 |
| 17.25 kVA | 0.8832 |
| 20.7 kVA | 1.0636 |
ERSE prices for normal low-voltage customers (>2.3 and ≤20.7 kVA), before VAT, the same on all nine islands. Not a spot, wholesale or day-ahead price: the Azores have no electricity market.
Reporting period: 2026 [source]
Every figure on this page comes from one of the documents below. The worker checks them daily (plans, reports) and weekly (tariffs); if a document changes or does not respond, the values here stay the last validated ones.
- ERSE/EDA — Plano de Desenvolvimento e Investimento das Redes de Transporte e Distribuição da RAA 2022–2024retrieved 19/09/2026, 00:00:00 · last verified 19/10/2026, 09:23:28 · checked daily
- EDA — Relatório da Qualidade de Serviço 2025, Anexo III (indicadores de continuidade, BT)retrieved 19/09/2026, 00:00:00 · last verified 19/10/2026, 09:23:28 · checked daily
- EDA — Relatório de Gestão 2023 (Contas e Sustentabilidade)retrieved 19/09/2026, 00:00:00 · last verified 19/10/2026, 11:23:29 · checked daily
- ERSE — Tarifas e preços para a energia elétrica e outros serviços em 2026retrieved 19/09/2026, 00:00:00 · last verified 17/10/2026, 07:23:21 · checked weekly
Checked on 19 Sep 2026: the EDA website exposes no public endpoint (JSON, CSV, XLSX or API) with generation or consumption; its pages are rendered in the browser, without data. That is why there is no 15-minute cycle: there is nothing to read.