My cousin is a ward member in a small municipality near Nagaon, and last month he called me in a slight panic. The APDCL bill for his ward’s streetlights had jumped again, and nobody in the office could tell him whether the number on the paper was actually correct, or whether the meter reader had made a mistake somewhere in the fixed charges. He just wanted someone to walk him through the math on a plain sheet of paper. If you handle electricity payments for a Gaon Panchayat, a municipal board, a PHE water scheme, or the Guwahati Municipal Corporation, you’ve probably had that same moment, staring at a bill full of abbreviations like FPPPA and LT-PWW, trying to figure out where the money actually went.
What this calculator actually is
This is not an official APDCL product. It’s a manual worksheet, and the logic behind an unofficial online tool, built specifically for the two utility categories civic bodies deal with: Public Lighting (streetlights, high-mast poles, park illumination) and Public Water Works (PHE pumping stations, rural water schemes, urban water intake plants). These sit under APDCL’s LT and HT tariff schedules, fixed by AERC, the Assam Electricity Regulatory Commission. Panchayat secretaries and PHE engineers already do this math every month, usually on paper, usually with a calculator app on their phone. This just organizes that same process.
APDCL Public Utilities Tariff Rates
Public Lighting and Public Water Works don’t share one flat rate, and this is where most confusion starts.
| Utility Category | Voltage Level | Energy Tariff Rate | Fixed Demand Charge |
|---|---|---|---|
| Public Water Works (LT-PWW) | Low Tension | ₹7.20/kWh | ₹160.00/kW/month |
| Public Water Works (HT-PWW) | High Tension (11kV / 33kV) | ₹6.90/kVAh | ₹240.00/kVA/month |
| Public Lighting (LT-PL) | Low Tension | ₹7.60/kWh | ₹140.00/kW/month |
Notice the HT-PWW rate is actually lower per unit than LT-PWW, even though the fixed charge is higher. That trade-off matters once a pumping load crosses a certain size, and it’s worth coming back to later.
The formula behind the numbers
Streetlight consumption isn’t complicated once broken down. Two steps, nothing more. Daily Consumption (Units) = (Total Fixture Wattage × Night Operating Hours) ÷ 1000 Monthly Consumption (Units) = Daily Units × 30 Days Water pumping stations follow the same logic, just with motor kW instead of lamp wattage, and running hours instead of night hours.
How to Use the Calculator
Step 1. Select your utility category: Public Lighting (Streetlights) or Public Water Works (PHE Pump Station).
Step 2. Enter Connected Load / Wattage, in kW, or as total fixtures × per-lamp wattage. Step 3. Enter Operating Hours, how many hours per day the system actually runs (e.g. 11 hours of night lighting).
Step 4. Click “Calculate Utility Bill” to see Total Monthly Units, Energy Charges, Fixed Load Fees, FPPPA, Duty, and your Net APDCL Payable amount.
A worked example from Guwahati
Take a municipal ward in Guwahati with 100 LED streetlights, 50W each, running 11 hours a night.
My cousin’s ward has close to this exact setup, minus about fifteen fixtures. When I ran his numbers through this same method, the total came within a few hundred rupees of what the office had already paid, which told him the bill wasn’t wrong, the confusion was just in reading the breakup.
Why HT connections matter for bigger pump stations
Coming back to that trade-off from earlier, a PHE water scheme running a large pump, say above 20-25 kW connected load, will usually save money over a year by switching from an LT to an HT connection. The per-unit rate drops from ₹7.20 to ₹6.90, and even with a slightly higher fixed charge, savings on energy consumed tend to outweigh it once the load is large enough. Smaller schemes don’t benefit the same way. Worth confirming with the local APDCL sub-divisional office before switching, not something to decide off a blog post.
Kuch sawaal jo log aksar poochte hain
Kya Public Lighting tariffs commercial tariffs se saste hote hain Assam me?
Haan. Public Lighting (~₹7.60/unit) aur Public Water Works (₹6.90-₹7.20/unit) dono LT Commercial se kaafi kam hain, jo ₹9.80/unit tak jaata hai. Ye rate isliye rakha gaya hai taaki local civic bodies par financially zyaada bojh na pade.
Gaon Panchayats aur Municipalities apna street lighting bill kaise kam kar sakti hain?
Teen practical tarike, impact ke hisaab se: pehla, purane sodium-vapor ya halogen lamps ko LED se replace karna, jisse power consumption lagbhag aadha ho jaata hai. Doosra, photocell sensors ya astronomical timers lagana, jisse din me light open rehne ka waste ruk jaaye. Teesra, grid access na hone waale stretches par standalone solar streetlights, jahan us portion ka bill hi khatam ho jaata hai.
Hamare PHE pump station ka LT connection hai, kya HT me switch karna sahi rahega?
Load size par depend karta hai. Roughly 20 kW se neeche paperwork ka jhanjhat usually worth nahi hota. Uske upar, actual conversion cost pehle apne local APDCL office se confirm kar lein.
Is this an official APDCL calculator, ya sirf ek estimate hai jo hum khud verify karke follow karein?
No, ye official nahi hai. Ye tool published tariff categories par based hai taaki aap apna bill closely estimate kar sakein, lekin aapka actual bill APDCL directly aapke metered load aur consumption ke basis par generate karta hai. Tariffs AERC orders ke through revise hote rehte hain, isliye final payment se pehle current rate zaroor confirm kar lein.
Official Resources
Public Lighting aur Public Water Works tariffs AERC orders ke through revise hote hain, isliye seedha check karna behtar hai:
Agar aapka ward ya panchayat is calculation se bahut alag number dekh raha hai, pehle apne bill ka breakup line-by-line padhein, zyaadatar gadbad rate me nahi, misreading me hoti hai, jaisa ki mere cousin ke case me hua tha.
