Time-of-day changes the value
Since 1 April 2026 most Bihar connections above 10 kW, and all smart meters, are billed by time of day: 9 am–5 pm at 80% of the normal rate, 5–11 pm at 120%. Solar units land in the cheaper window.
Home / Areas we serve / Kishanganj & Purnia
Rooftop solar in Kishanganj, Purnia and Katihar
Mills, cold stores, hospitals, schools and homes in north-east Bihar.
Kishanganj is closer to our Siliguri store than most of West Bengal, but Bihar’s rules are different. Solarverse Solutions designs and installs rooftop solar across Kishanganj, Purnia, Katihar and Araria as an authorised Waaree channel partner, sized to NBPDCL’s billing and Bihar’s time-of-day tariff.
Kishanganj & Purnia at a glance
| Electricity supplier | NBPDCL (North Bihar Power Distribution Company) |
|---|---|
| Rooftop rules | BERC net and gross metering regulations, 2018. From 1 kWp up to your sanctioned load. Surplus carries forward from bill to bill; anything unadjusted at the end of the settlement period lapses unpaid. A check meter is needed above 20 kW. |
| Expected generation | 3.4 to 4.0 units per kWp a day on a shadow-free roof, about 1,241 to 1,460 a year |
| Sunshine on flat ground | 4.51 kWh per m² a day on average; strongest in April (5.8), weakest in January (3.2) |
| Noon sun | 40° above the horizon on 21 December, 87° on 21 June |
| Daylight | 10 h 30 min on 21 December, 13 h 46 min on 21 June |
| Winter parapet shadow | A 3 ft parapet on the south edge shades about 3.5 ft of roof at noon on 21 December, and 4.7 ft at 9 am. Panels start beyond it. |
| Home subsidy | PM Surya Ghar central assistance for homes on DCR panels, up to the 3 kW level, as in West Bengal. Amounts and process. |
Sunshine, month by month
Local know-how
What is different about Kishanganj & Purnia
Mills, dryers and cold stores
Rice and maize mills, makhana processing and cold stores use most of their power by day in season. We size to the units solar can reach.
Bihar’s net metering
From 1 kWp up to your sanctioned load under the BERC 2018 regulations. Unadjusted surplus lapses at the end of the settlement period, so we size to your yearly use.
Flood-season planning
Low-lying sites near the Mahananda and the Kosi see monsoon flooding. Inverters, boxes and earth-pit covers go above the flood line.
Where we work
Towns we cover around Kishanganj & Purnia
Homes, shops, hotels, hospitals, schools, mills and factories.
- Kishanganj, Thakurganj & Bahadurganj
- Purnia, Banmankhi & Kasba
- Katihar, Barsoi & Manihari
- Araria & Forbesganj
- Jogbani & Narpatganj
Questions
Asked in Kishanganj & Purnia
Do you install rooftop solar in Kishanganj and Purnia?
Yes. Kishanganj is next door to our Siliguri store, and we work across Purnia, Katihar and Araria too. We survey, design, install, file the NBPDCL net-metering papers and maintain the plant.
How does Bihar’s time-of-day tariff affect solar?
On time-of-day billing, units used from 9 am to 5 pm are billed at 80% of the normal rate, so each solar unit saves a little less than a flat-rate unit would. Our calculator allows for it when you choose Bihar.
Is PM Surya Ghar available in Bihar?
Yes. Homes in Bihar can claim central assistance on DCR panels up to the 3 kW level, the same as in West Bengal. We handle the application and the claim.
Solar for Kishanganj & Purnia, in writing
Send your last three electricity bills and a photo of the roof on WhatsApp. You get a written sizing, whether or not you buy.