Supply is capped at the contracted capacity in every hour — the drawee holds a GNA contract demand and cannot draw above it. CUF = energy delivered ÷ (contracted capacity × 8760), scored annually and held as a hard floor in year 1.

Group-captive equity is drawn at COD and returned at face value at PPA end, so the developer equity IRR separates from the SPV's. 0 = pure developer equity.

The solver holds the decided capacity and searches only the battery (and anything you leave free) that reaches the target CUF at the lowest tariff.

The capacity charge is spread over the units delivered to the customer — never over exchange spill — and lands on the customer’s tariff, not the developer’s opex. The ISTS waiver steps by commissioning date; confirm the ladder against the current CERC sharing regulations before quoting it.

The customer pays for every unit supplied against the contract, and all losses and charges are to their account. Anything the dispatch pushes above the contracted capacity is the developer’s exchange spill — the customer neither receives nor pays for it. So a unit billed is not always a unit used: two rates are reported, the landed tariff per billed unit (what the invoice works out to) and the effective cost per unit actually consumed, which carries the network losses and any surplus delivered above the customer’s instantaneous demand. Savings compare the blended tariff against what the customer pays today.

100 = no limit · 0 = no spill at all. Any value in between is honoured exactly.

Left unlimited in sell mode the solver will oversize and run to the capacity bounds — at a healthy exchange price the marginal MW funds itself on spill.

The hourly merchant price the excess stream sells at (e.g. IEX DAM), 8,760 rows. Its own template, deliberately separate from generation — a zero or missing price column silently overstates every solved tariff. Without an upload the bundled price curve applies; a price upload always wins over any price column inside a generation file.

The battery discharges into any hour with a deficit — a flat CUF obligation has no window to reserve state of charge for.

Which one applies is a commercial question, so it is an input rather than a house rule. Year 1 sizes the battery to clear the target at COD and lets it decay after that. Every year holds the target for the whole term — and it does not mean sizing for 25 years of decay: the battery only has to carry as far as the first augmentation, because each top-up restores it for the cycle that follows. So the binding year is the last one before that first event. Solar and wind decay across that window too, which is why that year binds and every earlier one comes free. Every-year compliance makes augmentation structural, so “None” is switched to “Maintain CUF” and the result says so.

The CUF floor binds year 1. Maintain CUF sizes each window's top-up to hold that floor to the end of the window; None lets it decay, which is the default and the conservative offer.

The search is exhaustive, not sampled: every buildable solar × wind cell that could hold the CUF floor and stay inside the excess limit is fully priced, then solar is refined around the winner. Wind moves only in whole turbines; the battery and every top-up are ordered in whole blocks, so the winner is a system that can actually be ordered. Battery may be zero where solar and wind alone clear the target. The budget caps priced cells — if a full walk would not fit, the step is widened and reported, which is still a complete walk of a coarser lattice rather than a sample of a finer one.

Download the template, fill the two value columns — solar pu of MWp, wind pu of MW — for all 8,760 hours, and upload it back. The original RTC workbook layout (cols E/F/U) and a 2- or 3-column CSV are accepted too. Leave empty to use the shipped CTU profiles.

Sized on the installed quantum (solar AC + wind), which is also the connectivity figure reported in the results. Instantaneous injection is not capped in this build.

Losses thin the billable contracted energy only — never the exchange sale. Charges come off the tariff. The GNA charge applies to the installed quantum, not the contracted capacity.

CAPEX splits pro-rata into an RE block (solar, wind, land, infra) and a battery block, each with its own life and WDV rate. Leave blank to use the project life and the headline WDV — which reduces exactly to a single pool.

Draw phasing by construction month, as a % of hard CAPEX. IDC is solved as a fixed point against this, so the column must sum to 100%.

Re-prices the solved sizing on the server — the same engine, so the figures can never disagree with the solve. Recalculate refills the solved tariff.