Read availability, degradation, and O&M cost over the 25-year asset life so the IRR rests on real operations. Reach for this on an operating-asset question.
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---
name: read-asset-performance
description: "Read availability, degradation, and O&M cost over the 25-year asset life so the IRR rests on real operations. Reach for this on an operating-asset question."
---
# Skill: Read asset performance over life
A solar asset is a 25-year machine; the life drives the IRR.
## Step 1 — Measure availability and yield
Actual vs P50/P90 expected production (§3 #6).
## Step 2 — Track degradation
Module degradation and inverter health over time (§3 #5).
## Step 3 — Read O&M cost
O&M and replacement cost against the pro-forma.
## Step 4 — Reforecast the IRR
Update the return with realized performance.
## Output
An availability/yield read, a degradation track, an O&M-vs-pro-forma view, and a reforecast IRR.
