Watt
A clip-on meter on your main line, and the answer the bill never gives: which thing is spending the money.
NOW
1.42
kW on the main line
CYCLE
₹2,002
331 units
September, against the slabs₹4,380
You cross 400 units on Monday. After that every unit costs ₹10.00.
7:42
Now
Thu 17 Sep · Anbu Nagar, Coimbatore
Clip-on meter, main line
1.42kW
live
1420 W
Today14.8 units · ₹115cycle 331 · ₹2,002
12 am6 amnoon6 pm13 days left
On right now5 of 12 tracked
Air conditionerBedroom · since 7:20980 W
RefrigeratorCompressor running165 W
Ceiling fansThree of four165 W
LightsNine points72 W
TelevisionWith the set-top box38 W
The fridge held 165 W for nine hours last night. It should cycle. Check the door seal; if it smells hot, call an electrician.
Now
Appliances
Bill
Trials
Coromandel Power · 1 – 30 September
Anbu Nagar, Coimbatore · the August bill arrives
₹4,380, and nobody in the house can say where it went.
Everyone blames the air conditioner. It is the twelve-year-old fridge in the corner, running all night, every night, for years.
Coromandel Power Supply
Electricity bill · domestic
Consumer
61 4429 0187
61 4429 0187
R. Meenakshi · 14 Anbu Nagar, Coimbatore 641045
Domestic · single phase · 5 kW sanctioned
Billing period 1 – 31 August 2026
Domestic · single phase · 5 kW sanctioned
Billing period 1 – 31 August 2026
Previous
28,416
Present
29,000
Units
584
100 @ ₹4.20₹420
100 @ ₹5.60₹560
200 @ ₹7.80₹1,560
184 @ ₹10.00₹1,840
Total payable
Pay by 12 Sep 2026
Pay by 12 Sep 2026
₹4,380
3.2 units
a day, every day. ₹720 of this bill. A new 260-litre one uses about 0.8 — roughly ₹540 a month less.
liveWatt clips a sensor on the main line and answers it in a day. Estimates from measured draw, not promises.
What your house is doing this second
One clip-on sensor on the main line, sampled every second, split across the things it recognises.
7:42
Now
Thu 17 Sep · Anbu Nagar, Coimbatore
Clip-on meter, main line
1.42kW
live
1420 W
Today14.8 units · ₹115cycle 331 · ₹2,002
12 am6 amnoon6 pm13 days left
On right now5 of 12 tracked
Air conditionerBedroom · since 7:20980 W
RefrigeratorCompressor running165 W
Ceiling fansThree of four165 W
LightsNine points72 W
TelevisionWith the set-top box38 W
The fridge held 165 W for nine hours last night. It should cycle. Check the door seal; if it smells hot, call an electrician.
Now
Appliances
Bill
Trials
An instrument, not a dashboard tile1,420 watts read off the main line, no averaging
Every watt is accounted to somethingThe five things that are on add up to 1.42 kW
And it says when something misbehavesThe fridge held 165 W for nine hours — it should cycle
7:43
Appliances
September, projected to the 30th
Ten things, all of September
₹4,380
584 units
Every row at your
blended rate,
₹7.50 a unit
blended rate,
₹7.50 a unit
Air conditionerBedroom, 1.5 ton · 174 h · 1.25 kW average₹1,635218 units
Refrigerator2013 model, 260 L · on all month · 3.2 units a day₹72096 units
Water heater3 kW storage · 28.7 h · 57 min a day₹64586 units
Ceiling fansFour fans, 55 W · 1,018 fan-hours₹42056 units
Washing machine18 loads · 1.55 units a load₹21028 units
Mixer, induction, microwaveCounted together · 41 min a day₹19526 units
Lights31 LED points · 3.6 h a day₹18024 units
Television and set-top box120 W · 183 h₹16522 units
Water pump1 hp · 21 h · 43 min a day₹12016 units
Router, chargers, standby17 W, never switched off₹9012 units
Now
Appliances
Bill
Trials
Ten things, ranked by what they cost you
Hours and watts on the left, rupees on the right, and the two columns add up to the bill. Nothing is bucketed as “other”.
Air conditionerBedroom, 1.5 ton₹1,635218 units
174 h
hours it ran
1.25 kW
average draw
218 units
174 × 1.25
₹1,635
218 × ₹7.50
584 units × ₹7.50 = ₹4,380
₹7.50 is this month’s blended rate: the forecast divided by the units. Every row is priced the same way, so the ten rows add to the bill.
Second on the list is a fridge nobody suspected96 units a month, ₹720, and it never switches off.
The moment a unit gets more expensive, on a date
7:44
September bill
Coromandel Power · 1 – 30 Sep · 13 days left
Heading for
₹4,380584 units
Metered so far
₹2,002
331 units
meteredprojectedtop slab
You cross 400 units on Monday 21 September. From that unit on, every unit costs ₹10.00 instead of ₹7.80.
SLABRATEUNITSAMOUNT
First 100₹4.20100₹420
101 – 200₹5.60100₹560
201 – 400₹7.80200₹1,560
401 and up₹10.00184₹1,840
Projected total584₹4,380
Stop at 400 units and the bill is ₹2,540. A projection, not a promise.
Now
Appliances
Bill
Trials
Where it lands₹4,380, 584 units
Unit 401 costs ₹10.00The step you can see coming
Four slabs, four amountsThey add to the total at the top
Monday 21 September
Stop at 400 units and the bill is ₹2,540.
Change one thing. Watch the meter answer.
₹142
saved in nine days, from two small changes.
7:45
Trials
Change one thing, measure for two weeks
Saved this cycle, two trials running
₹14214.2 units
Priced at ₹10.00 —
the slab just ahead
the slab just ahead
Water heater, 20 minutes lessDay 9 of 14 · started Wednesday 9 September · 1.0 unit a day₹909.0 units
5 days to go
1 Sep9 Sep · trial starts17 Sep
Air conditioner at 26°, not 23°Day 4 of 14 · started Sunday 13 September · 1.3 units a night₹525.2 units
10 days to go
Suggested: defrost the fridge, check the door sealWorth 8 – 14 units a month if the seal is the problemStart
Now
Appliances
Bill
Trials
7:45
Trial
Water heater,
20 minutes less
20 minutes less
3 kW element · timer moved from 6:10 to 6:30 · day 9 of 14
Eight days before
3.6
units a day
Nine days since
2.6
units a day
1 Sep9 Sep17 Sep
1.0 unit a day20 min less on a 3 kW element
9.0 units in 9 days₹90 at ₹10.00, the slab you are heading into
13 days left₹130 more if the timer stays put
Keep it to 30 SepEnd trial
Measured on your own meter, not modelled. 86 units for the month at this rate.
Tariff-slab forecast · September
Units across, rupees a unit up. Each block’s area is the money in it.
Solid is metered
331 units are already on the meter. The hatched part is the pace you are on, not a guess at the weather.
The rule is the cliff
At unit 400 the rate steps from ₹7.80 to ₹10.00. You reach it on Monday 21 September.
The last block is the bill
The 184 units past 400 cost ₹1,840 — 42% of ₹4,380. Stop at 400 and it is ₹2,540.
Nobody has ever told you what your house does all night.
Watt clips a sensor onto your main line and names every watt of it — by appliance, by hour, in rupees.
WattA Goat Scale concept
Coromandel Power · domestic slab tariffSeptember 2026
Unit 401 costs a quarter more than unit 400.
₹7.80
a unit
Unit 400
The last one at the third slab rate. You reach it on Monday.
₹10.00
a unit
Unit 401
And every unit after it, until the meter is read on the 30th.
+28%
Watt tells you the date you cross, four days before you get there. This month it is Monday 21 September.
₹1,840
the 184 units past 400 — forty-two per cent of the bill
WattA Goat Scale concept
WattDesign system v1 · instrument dark
SORA · 400 / 500 / 600
Where the next unit lands
Headings, labels, sentences. Never numbers.
JETBRAINS MONO · 400 / 700
1.42 kW
₹4,380 · 584 · ₹10.00
Anything you read off an instrument.
INSTRUMENT
Live draw
1.42kW
ROW, CHIPS, BUTTONS
Water heater3 kW · 57 min a day₹64586 units
Start a trialEnd trial₹10.00 slab331 units
day 9 of 14
ICONS · 24PX, 1.7 STROKE
Designed by Goat ScaleWatt · home electricity, appliance level