I am excited to announce that my first net metered electricity bill is here! At our home in Delhi, we would regularly get electricity bills of Rs. 15,000- 25,000 each month for our floor. Being a joint family, the home is occupied throughout the day and the electricity bills were becoming a major expense. Then in mid 2015, we installed a solar plant on the roof.
Specification of the Solar Plant:
|Modules||250 Wp x 16, Indian made|
|Solar Inverter||3.7 kW, 3 phase inverter, Austrian made|
|System Type||Grid Synchronous, net metered|
|Structure||Galvanized iron, Raised by min 6 ft|
This January BSES approved net metering for my home and replaced our meter with a two way net meter.
From paying a Rs. 19,000 electricity bill in January 2016, we received a bill of only Rs. 1,406 for February and March combined!
Here are the key aspects of our net metered electricity bill. Refer to the annotation in attached bill image for bullet points below:
- The bill was generated for 1.7 months
- In Delhi, we have slabbed tariffs for the residential sector (Rs. 4, 5.95, 7.3, 8.1 and 8.75 per unit plus taxes). The highest slab inclusive of taxes costs Rs. 10.4 per unit. Our consumption used to consistently go up into the highest tariff slab, but this month, we consumed less than 200 units per month (from the grid) and are in the lowest slab of Rs. 4/unit.
- In fact, because we generated less than 200 units in the month, we received the Kejriwal government’s subsidy of Rs. 2/unit. This is a small reward for spending capital to install green and clean energy, our contribution to the environment.
- Our net metered electricity bill is less than 5% of our January billing of Rs. 19,100.
- The reverse page of our electricity bill now has a new section showing net metering details. This shows that after daytime consumption of solar, we exported 435 units of electricity.
- We imported only 723 units of electricity in the time period of Feb and March
- Our net billed units are (7-5) i.e. 288 units for the nearly two month period.
- Another interesting point to note is that our maximum demand (MDI) at 5.6 kW is substantially lower than our sanctioned load of 19 kW. This is because when part of the load in the peak daytime is met by solar the kW load on grid is reduced. We will track this closely for a the summer and can decide to reduce our connected load and free up some demand for others on the grid.
Finally, I compared our consumption to another floor in the same building with identical occupancy and consumption patterns for the same season.
- As you can see, the floor without solar was billed Rs. 13,450 for March only as compared to Rs. 1,406 for the floor with a solar connection.
So there you have it, the proof is in the pudding. Solar has a dramatic impact on our electricity bills and at this rate our family will get breakeven on our investment in 2-3 years after which the electricity will be completely free, sponsored by the Sun!