It's been a while since I updated the forum about savings made via solar. First things first, here are my TATA power bills from November and December 2019. November 2019 — Net producer of electricity by a measly 12 units; got fixed charges on the bill got subsidized. December 2019 — Consumed more than produced because of halogen heaters. Net consumed 94 units (106 units for the month and negative 12 units from the month before), got full subsidy again. The system has produced 1.65Mwh so far at the time of writing this. Upon calculating the expense saved so far assuming an average rate of unit 6rs (I know it ranges from 3-8 but don't want to inflate / deflate savings), it turns out to be around 10k so far. Also, a big shout to Mr. Kejriwal who subsidizes electricity bill if 200 units are consumed (50% subsidy if you consume between 201-400 units). This means additional savings of at least 1000 bucks each month and if you consume 200 units more than your solar produces, that's an additional 600 bucks subsidized by the government. Disclaimer: Please use electricity judiciously - any subsidy or lack of it should not lead to moral hazard. Go Green! Go Solar!

Since the first bill was only adjusted for 20 days with units produced by solar, this month's bill provides a better picture for the whole month. October's bill after netting off units is zero. Yes, ZERO! Here's a screenshot of my bill followed by the consumption annexure: I have added extra details in the above screenshot to show how the current demand of INR 1208 is subsidized fully and the payments made in past 6 months. Sadly, due to dense smog in Delhi from past couple of days the plant is not producing even the average units. Hopefully, the plant will be running at its optimum capacity again in next couple of days.

Solar plant commissioned around 15th September which led to some delays in bill generation by tata power. They split the billing cycle of 30 into two periods (10+20) starting from 10th September when they installed the net meter. Here is a breakup of my energy bill for those 20 days. This roughly translates to a bill of INR 1923 by simply multiplying 1282 * (30 / 20). Please note, this is a very crude and prudent estimate as the plant had not been running efficiently due to some hiccups highlighted in my blog. Here is the solar consumption annexure I got with my bill which detailed the units I consumed, supplied to the grid and the net usage. As a basic check, I tallied this against what the monitoring device and the inverter had recorded. The annexure clarifies two things which a lot of solar enthusiasts had asked me: 1. Treatment of excess units - the excess units are adjusted against next month's consumption. Also, if you are a net producer in a financial year the customer will be paid via cheque. However, this doesn't clarify how the tariff will be determined. 2. I have got a 50% subsidy in my fixed charges. However, the amount is subject to revision if there is any future notice from the goverment.