Power-sector tools
Data: 22/07/2026 · MWatt Hub catalog
14 data products and 21 calculators, built on official sources. Search, open, share the URL. Every figure with source and date.
1,774 TUST busbars · cycle 2026/2027 (Despacho nº 2.269/2026) · 931 substations in the connection queue · 283 plants with measured curtailment
Read our data-honesty commitment → (in Portuguese)
- Spotcast — Hourly PLD forecast, with a public track record
- TUST — TUST by busbar, without mining ANEEL spreadsheets
- Curtailment — How much wind and solar did Brazil curtail?
- Grid connection queue — Basic Grid access, by substation
- Pre-budget — Honest triage before the distributor's connection quote
- BESS — Where is a utility-scale battery worth it in Brazil?
- SimSolar — Is rooftop solar worth it at your home?
- Data centers — AI data centers in Brazil — map and ranking
- Capex ANEEL — Where does the money go in a Brazilian power plant?
- Mine BTC — Mine bitcoin at home or buy it?
- Where to mine — Where in the world is power cheap enough to mine bitcoin?
- Buzz — What's hot in the power sector, measured — not guessed
- Viz — Visualize pandapower networks directly in your browser
- Watts — Track home electricity use from meter readings, bills or smart-meter data
- MWatt AI — AI agent for power-system studies
- AI agents in power systems engineering — What AI agents already deliver in grid studies and what still depends on an engineer — task by task, judged by whether the result is verifiable
- Grid connection journey — The actual path for generation and load: owners, timelines, common failures and tools at each step
- Pay less — Find which path to evaluate first: bill audit, benefit, solar, subscription, time-of-use or efficiency
- Energy subscription — Got an offer? Calculate the effective discount after wire B, minimum billing and public lighting
- White tariff — Is switching worthwhile? Compare peak, shoulder and off-peak rates with the standard tariff
- Social tariff — Check eligibility and simulate the first 80 kWh of free electricity
- Bill auditor — Is your power bill correct? Open reconstruction with tariff, flag, minimum bill, wire B and taxes
- Hosting capacity map — Estimated DG hosting capacity per feeder — 51 utilities / all 27 Brazilian federative units (BDGD)
- Grid connection — transmission — Large generator on the Basic Grid via ONS — official margins, access study, queue and PLD
- Connect large load — Data center, mining and BESS as large load — access, grid study and connection cost
- Energy unit converter — MWh, MWm, kW, kWp, GWh/year and tariffs R$/MWh ↔ ct/kWh
- EUST calculator — Monthly and annual EUST from TUST (R$/kW·month) and MUST (kW)
- Hashprice today — How much 1 TH/s and 1 MW of mining yield today, and the power cost that breaks even per rig
- Tariff flag — Current flag, history and bill calculator (kWh × surcharge) — ANEEL
- Spot price (PLD) now — Current hourly PLD by submarket and next 12 h (Spotcast)
- My utility — What 30 utilities publish (map, portal, forms) — shortcut to Pre-budget
- Minimum bill by utility — The minimum monthly charge for each of Brazil's 51 distribution utilities
- Availability cost (minimum bill) — 30 / 50 / 100 kWh × tariff (R$/kWh) — group B minimum (REN 1.000)
- DG deadlines — MMGD connection deadline table from REN 1.000/2021, article by article
- Distributed generation modalities — Local, remote, shared and multi-UC — Law 14.300 definitions and which to choose
- Net metering and Law 14.300 (wire B) — SCEE, credits (60 months), wire-B schedule (2026 = 60%) and rights until 2045
- Brazilian power sector glossary — PLD, TUST, MMGD, SIN and other terms — neutral definition with link to official source
- Methodology — Honesty commitment — source and date on every figure
Newsletter
An occasional email with what the data showed — monthly curtailment, new tariff cycles, Access Season milestones — always with figure, source and method. No spam, no list selling.
FAQ
- What is MWatt Hub?
- MWatt Hub is the data-tools platform for Brazil's power sector (and European power prices) maintained by Matheus Duarte. The public free tools: PLD (Brazil's spot price) forecasts with a public track record (Spotcast), TUST (transmission tariff) by busbar (TUST), curtailment history (Curtailment), Basic Grid access by substation (Grid connection queue), GD connection pre-quote (Pre-budget), battery pre-feasibility (BESS), residential solar viability (SimSolar), AI data centers, plant Capex ANEEL, bitcoin mining (Mine BTC / Where to mine), sector buzz (Buzz), and pandapower network visualization (Viz). And Matt: an AI agent that runs interconnection studies (power flow, N-1 contingency) on your network model.
- Are the data reliable? Where do they come from?
- Every figure comes from official open sources — ONS, CCEE, ANEEL, EPE and MME — with the origin document and date cited. Derived values are labeled as own calculations, assumptions are marked as assumptions, and what has no source shows as missing: we never estimate in place of the official figure.
- How much do the tools cost?
- The tools are public and free. Some products offer deeper reports on demand, always marked on the product page itself.