REplanner/ the sizing tool
Build the portfolio.
See what it lands at.
Contracting renewable capacity is easy. Contracting capacity your plant can actually consume, in the fifteen-minute block it arrives, is the part that decides whether the bill falls. Move the sliders and watch both.
- Open access solar29% · 18.5M kWh
- Open access wind23% · 14.5M kWh
- Rooftop solar8% · 4.7M kWh
- DISCOM grid40% · 25.2M kWh
Landed cost by source
A planning aid, not a quotation. Capacity factors, ex-bus tariffs and charges are indicative and vary by state, site and year; matching is modelled annually rather than block by block, so treat the renewable share as a direction, not a contract position. A real case is built against your metered load profile.
What it is telling you/ read this bit
More capacity
is not more savings.
A unit generated at noon does not pay for a unit consumed at 2 am. Push solar past what the daytime load absorbs and the extra shows up as spill — built, paid for, never consumed. Blended cost rises even though renewable share does not.
Wind costs more per unit ex-bus than solar and has a different generation profile — nights and monsoon, when solar is absent. A mixed portfolio matches a round-the-clock industrial load far better than either alone.
Storage is not a way to buy more renewables; it is a way to use the ones you already bought. Watch spill collapse and renewable share climb as MWh go in — and watch the blended cost respond to the discharge cost you assume.
Open access charges — wheeling, banking, cross-subsidy, additional surcharge — vary by state and move year to year. They are the difference between a strong case and a marginal one, which is why they are a slider and not a constant.
In short/ REplanner
REplanner is a free sizing tool that shows what a renewable portfolio — open access solar and wind, rooftop solar and storage — actually lands at for an Indian plant, in cost and in renewable share.
Enter annual consumption, the DISCOM tariff, open access solar and wind capacity, rooftop capacity, battery storage and its discharge cost, and the open access charges. REplanner returns the renewable share of units actually consumed, the blended cost per kWh against tariff, the annual saving, carbon avoided, the share of generation spilled because it arrived in blocks the plant was not consuming, and what storage rescued. Over-building shows up as spill and a rising blended cost, which is the point.
What to take away
- Renewable share is capped by what the plant consumes in the block the generation arrives in, not by capacity contracted; beyond roughly 60% of a round-the-clock load, more capacity spills rather than substitutes.
- Default scenario: 63 MU/yr at ₹8.00/kWh tariff, 12 MW open access solar, 8 MW wind, 3.6 MWp rooftop, no storage, ₹1.00/kWh open access charges.
- Storage is modelled at 330 cycles a year; the default discharge cost is ₹4.00/kWh, with LFP near ₹7 today and sodium-ion trending to ₹2.50.
- The grid emission factor used for carbon avoided is 0.71 kg CO₂/kWh.
What it assumes
- Capacity factors, ex-bus tariffs and charges are indicative and vary by state, site and year.
- Matching is modelled annually rather than block by block, so the renewable share is a direction, not a contract position; a real case is built on the metered fifteen-minute load profile.
Questions this page answers
Why does adding more solar lower my saving?
Should I add wind or storage?
What are open access charges?
Next/ your load profile
Run it on
your meter data.
This models matching annually. Your real position is decided block by block — which takes one year of metered consumption, and is the first thing a baseline produces.