GUIDES
Solar and storage for Indian industry
Six guides to the things a C&I solar proposal turns on — what a Time-of-Day tariff actually charges, what a battery earns back and how, how a system is sized from twelve electricity bills, and which rules changed this year.
Written for people who have to defend a number in front of a customer. Every figure here is either traced to a published tariff order, to NASA POWER, or to the engine that produces it — and where the honest answer is “the DISCOM does not publish that”, the guides say so rather than inventing one.
01
Solar for commercial and industrial sites in India
What behind-the-meter solar actually saves a factory, why self-consumption decides the answer, and how much a megawatt generates in your state.
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02
Battery energy storage (BESS) for industrial sites
What a BESS is in the terms a bill understands — C-rate, round-trip efficiency, depth of discharge — and the three ways it earns money back.
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03
Time-of-Day tariffs and the Indian C&I electricity bill
Zones, adders, kVAh billing, demand charges and the gap between a published energy charge and what the site actually pays.
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04
How solar and storage are sized from twelve electricity bills
The method: monthly units become 8,760 hours, satellite irradiance becomes a solar year, and 3,171 configurations get scored against one goal.
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05
Energy storage rules for Indian C&I solar
Universal ToD tariffs since April 2024, annual tariff revisions, and Maharashtra’s storage requirement for solar above 100 kW.
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06
Solar and battery storage glossary
Every term on a sizing report, defined once: MWp, kVAh, DoD, RTE, ToD zone, knee point, effective tariff, capex payback and the rest.
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Where these numbers come from
The tariff figures in these guides come from a library of Indian DISCOM Time-of-Day structures and rates transcribed from the published tariff orders — the order reference, its effective date and, in most cases, the page of the PDF the number was read from. The generation figures come from NASA POWER satellite irradiance.
Neither is a live feed, and the guides do not pretend otherwise. Tariff orders are revised annually; each page carries the date it was last checked, and anything a DISCOM does not publish is marked as not published rather than filled in with an estimate.
If you are about to quote one of these figures to a customer, read the Help & FAQ on what a study needs, and check the current order for the DISCOM you are quoting.