Concept

Levelized cost (e.g., $/t NH₃)

economic

Overview

Levelized cost is the constant per-unit cost — dollars per tonne of product — that, charged on every unit produced over the plant’s life, exactly covers all capital and operating cost at the required return. It collapses an entire TEA into one comparable number, the standard measure of cost competitiveness.

Body

What it is. It spreads every cost across every unit made, putting one-time capital and recurring operating cost on the same per-unit footing:

                 (CRF × total capex)  +  annual fixed opex  +  annual variable opex
levelized cost = ───────────────────────────────────────────────────────────────────
                                        annual output

The numerator combines the annualized capital charge (total capex × CRF) with annual opex. The denominator is actual output: nameplate × capacity factor × time, not the rating (see nameplate vs. operating capacity).

Its three shares. Capital share, fixed-opex share, and variable-opex share (dominated by feedstock and energy). The first two are fixed costs spread over output, so they scale as 1/capacity factor; the third is roughly utilization-independent per unit. The mix is what gives a route its cost structure.

Why it’s the headline. One number per route makes routes comparable to each other (gray vs. blue vs. green) and to the market price. It can be reported gross, or net of byproduct and policy credits and revenue — two different numbers.

It means nothing without its basis — the system boundary (gate-to-gate vs. cradle-to-gate), the capacity factor, and the CRF assumptions (cost of capital and life). Two levelized costs compare only when those agree. It’s a cost of production, distinct from the market price; the gap is margin (see revenue and credits).

Limits & typical error

Non-comparable across mismatched bases — a gate-to-gate figure beside a cradle-to-gate one, or at a different discount rate, life, or capacity factor, compares unlike things; because the basis is so often unstated, this is the most common way “X is cheaper than Y” goes wrong (see system boundary).
One number hides the cost structure that sets its sensitivity — two routes at the same $/t can respond oppositely to a utilization or price shock; the single figure conceals the fixed/variable split.
It inherits the CRF assumptions and capacity factor, with a wide band — quoting it to several significant figures implies precision the underlying ±30–50% estimate can’t support.
Dividing by nameplate understates it — using the rating spreads cost over units never made (see nameplate vs. operating capacity).
Gross-vs-net credit treatment changes the number — comparing a credit-netted figure to a gross one is apples-to-oranges.
It’s not a viability verdict — the cost to produce, not a market-clearing price or a return; below today’s price is a cost fact, not a complete conclusion.

Mini-example

Assembling green ammonia’s levelized cost, gross of credits, on the power-to-ammonia boundary. At the continuous baseline (~1,000 t/day, capacity factor ~0.90 → ~330,000 t/yr), the three shares carried from the prior pages:

capital share        (CRF × $1.0bn) / 330,000 t   ≈  $355 / t
fixed-opex share                                  ≈  $ 50 / t
variable share       electricity, ~10 MWh × $40   ≈  $400 / t
                                                   ─────────────
levelized cost                                     ≈  $805 / t NH₃

— roughly $800/t, every input a flagged round anchor from the CRF, opex, and feedstock-and-energy examples, so the shares are consistent by construction.

Edge case: run the same plant at capacity factor ~0.45 (intermittent power) and the two fixed shares roughly double per tonne while the variable share holds — lifting it to ~$1,200/t, the same plant ~50% more expensive purely from spreading fixed cost over less output.

Levelized cost (e.g., $/t NH₃)

Overview

Body

Limits & typical error

Mini-example

See also