# 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.

Canonical: https://joulewise.com/studios/replanner  
Publisher: jouleWise Advisory Services Pvt Ltd, Noida, India · Spain  
Reviewed: 2026-10-08  
Status: free planning tool; figures are indicative, assumptions stated

## In short

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.
## Facts

- 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.

## Assumptions and limits

- 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 and answers

**Why does adding more solar lower my saving?**  
Because generation only counts when the plant consumes it in that block. Past the matching limit, extra capacity is spilled or banked on unfavourable terms while you still pay for it, so blended cost rises.

**Should I add wind or storage?**  
Wind covers nights and the monsoon and raises matching for round-the-clock loads; storage moves generation into consuming blocks. Which is cheaper per unit shifted depends on the load profile and the state's banking rules.

**What are open access charges?**  
Wheeling, banking, cross-subsidy surcharge and additional surcharge, set by each state's regulator and changing year to year. They, not the ex-bus tariff, decide the landed cost.

## Related

- [Renewable energy transition](https://joulewise.com/solutions/renewable-energy-transition)
- [Renewable share is matching, not capacity](https://joulewise.com/insights/renewable-share-is-matching-not-capacity)

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