Solar capacity factor follows a fixed daily sine arc — zero before sunrise and after sunset, peaking near noon — multiplied by a randomly drifting cloud-cover term that periodically dips it hard for a passing cloud. Wind speed is an independent random walk whose mean level rises as the sun's contribution falls: windMean = base + nightBias·(1 − solarArc), so wind statistically tends to blow harder at night and during low-sun periods — a loose regional anti-correlation, not a hard rule. Wind power then runs through a cubic turbine curve (cut-in → rated → cut-out).
The hybrid trace is simply the two plants' outputs summed and re-expressed as a capacity factor of their combined nameplate rating. Because the sources rarely bottom out at the same time, the combined curve visits near-zero output far less often than either one alone — that gap-filling is the whole point of pairing them, and it shows up directly in the stability numbers below the chart: lower volatility (average size of jump between samples) and a smaller share of time spent near zero output.
- Wind gustiness — amplitude of the random walk driving wind speed minute-to-minute.
- Cloud passage rate — how often cloud cover swings between clear and overcast.
- Night/storm wind bias — how strongly wind favours the hours when solar is weak; 0% removes the anti-correlation entirely so you can compare against the realistic case.
- Plant sizing — installed kW of each source; the hybrid trace re-normalises to the combined rating so it stays comparable at any mix.