In short
- What you pay now: most private hospitals pay ₹9.40 a unit on HT III (₹11.75 in peak hours); government hospitals, free-treatment trust hospitals and NABH hospitals in village or town panchayats pay ₹7.75 on HT IIA. A unit that solar replaces costs a private hospital about ₹10.24.
- Rooftop solar covers part of the daytime load, with no investment through our zero-investment model.
- Open access (HT, 63 kVA and above): at an assumed ₹4.00 solar price, about ₹7.57 a unit through third-party and about ₹5.66 through group captive for a private hospital.
- Night load: solar covers daytime only. Banking is slot-matched, so banked solar cannot be drawn at night. Wind power, which often keeps generating into the evening and night, can cover some of it.
- Backup: a battery can carry critical loads through short cuts and reduce diesel running. We do not take away the generator backup you rely on.
Rates are from TNERC Tariff Order No. 6 of 2025 and were still in force on 11 October 2026. The order allows an inflation-linked rise of up to 6% from 1 July each year; the 2026 rise has not been ordered. Illustrative default values — request a site-specific quotation.
What a hospital pays TNEB
Illustrative default values — request a site-specific quotation. TNERC Tariff Order No. 6 of 2025.
The right mix for round-the-clock load
Daytime: rooftop solar. Usually the cheapest unit you can get, because it never leaves your premises (grid-connected rooftop plants can still carry network charges set by TNERC; we include whatever applies). With our zero-investment model, we fund, build and maintain it and you pay per unit used.
More of the daytime and some night: open access and wind. With an HT connection of 63 kVA or more, you can buy solar or wind power from a plant elsewhere. Solar bought this way only covers daytime units: third-party power gets no banking, and banked units are tied to their time slot. Wind often keeps generating into the evening and night. For a private hospital at an assumed ₹4.00 solar price: about ₹7.57 a unit through third-party and about ₹5.66 through group captive. Every charge worked out →
Illustrative default values — request a site-specific quotation. Open access figures assume a 33 kV solar plant supplying an 11 kV connection, with line losses, wheeling, transmission, scheduling, cross-subsidy surcharge and electricity tax counted. They leave out the additional surcharge (none ordered for power used after 30 September 2025; TNPDCL has proposed ₹0.63 a unit on third-party power from October 2026, which would make HT III about ₹8.20 and HT IIB about ₹8.12), Aran's facilitation fee, and, for group captive, the cost of your equity.
How we're paid for open access deals: a small facilitation fee on each unit delivered, shared by the generator and the buyer and agreed in writing before anyone signs. We never buy or resell the power.
Backup and spikes: a battery. A battery built on certified partner batteries can carry critical loads through short cuts, so the generator starts less often, and can cover demand spikes. When a battery pays →
What we keep in mind for hospitals
- Supply must never drop. Solar and batteries are added alongside your TNEB supply and your generator. We do not take away the backup you already rely on.
- Safety. Battery systems are designed to the CEA safety rules that apply to battery systems above 650 V from 1 April 2027 (as reported).
- Work around patients. We agree the work schedule with your engineering team before site work starts, so wards and theatres are not disturbed.
Common questions
Is solar worth it for a hospital that runs 24 hours?
Yes, for the daytime part of the load, which is usually large because of air-conditioning, lifts and equipment. Rooftop solar covers part of the day; open access solar covers more of the daytime, and wind can cover some of the evening and night.
What do hospitals pay TNEB per unit?
Most private hospitals pay ₹9.40 a unit on HT III. Government hospitals, free-treatment trust hospitals and NABH hospitals in village or town panchayats pay ₹7.75 on HT IIA. Both pay 25% extra from 6–10 am and 6–10 pm (TNERC Tariff Order No. 6 of 2025). Your EB bill shows which applies.
Can a battery replace our diesel generator?
No. We do not take away the generator backup you rely on. A battery can carry critical loads through short cuts so the generator runs less often, and can lower demand spikes above the 90% floor. We size it from your own load data.
Can a hospital get solar with no investment?
Yes. With our zero-investment model we fund, build and maintain the rooftop plant, and the hospital pays an agreed rate for each unit it uses. The agreement usually runs many years, so read the exit terms first.
Get a free check for your hospital
Send your last three EB bills on WhatsApp. We come back within two working days with what solar, open access and a battery could do. No obligation.
Thanks, we've got your details. The fastest next step: send your last three EB bills on WhatsApp.
Send bills on WhatsApp