Add up the appliances in your home, see how many kWh each one uses and what the bill comes to with tariff, tariff flag, ICMS, PIS/COFINS and the public lighting fee. Compare saving scenarios.
An appliance's monthly consumption in kWh is its power in kW times the hours of use per day times the days in the month. A 5,500 W shower running 30 minutes a day, every day, uses 5.5 x 0.5 x 30 = 82.5 kWh. Appliances with a compressor or thermostat, such as a fridge or an air conditioner, do not draw nameplate power all the time, so each row has a duty factor (fridge around 30%, air conditioner around 60%) and a standby draw. These values are typical and editable; your appliance's label is worth more. The bill starts from the utility's tariff, which adds the TE (energy tariff) and the TUSD (distribution system use tariff), always before taxes. The tariff flag adds an amount per kWh: yellow is R$ 1.885, red level 1 is R$ 4.463 and red level 2 is R$ 7.877 per 100 kWh, while green adds nothing. ICMS and PIS/COFINS then apply "inside the price": the tax is part of the final amount, so the pre-tax value is divided by (1 - PIS/COFINS) x (1 - ICMS). With a R$ 0.80 tariff, 18% ICMS and 5% PIS/COFINS, a kWh costs R$ 0.80 / 0.779 = R$ 1.027, and 200 kWh cost R$ 205.39. The CIP/COSIP, the municipal public lighting contribution, comes after as a fixed amount set by the city. There is also a minimum billed consumption: 30 kWh for single-phase service, 50 kWh for two-phase and 100 kWh for three-phase. Utility tariffs come from ANEEL open data and change at each annual adjustment, so every entry shows its validity period and the homologating resolution. The flag amounts are also set by ANEEL, which announces each month's flag.
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Multiply its power in kW (watts divided by 1,000) by the hours of use per day and by the days in the month. A 5,500 W shower used 30 minutes a day for 30 days uses 5.5 x 0.5 x 30 = 82.5 kWh. For fridges and air conditioners, also multiply by the duty factor, because the compressor cycles on and off.
Enel SP: residential B1 tariff valid until 07/03/2027 (REH 3.596/2026 (03/07/2026)). Source: ANEEL open data.
On the invoice, look for the item table with "Tarifa" and TE/TUSD per kWh, or the "Tarifa sem tributos" / "Tarifa com tributos" field. Add TE and TUSD if they are listed separately. Utility tariffs checked in 10/2026.
Model powers and hours are typical values, in the order of magnitude of efficiency labels (Procel/Inmetro) and datasheets. Edit them with the data from your appliance's label.
Move the controls to see how much each habit weighs on the bill.
ICMS and PIS/COFINS vary by state, consumption band and month. The starting values (18% and 5%) are a starting point: use the percentages from your bill's tax box.