What it is: The generation mix is the composition of electricity supply by fuel type — natural gas, coal, nuclear, hydro, wind, solar and others. Outage rates track the percentage of generating capacity that is offline due to planned maintenance or unexpected (forced) outages.
Why it matters: A diverse generation mix helps maintain reliability and price stability. High penetration of renewables can suppress prices during periods of abundance but may increase volatility when output dips. Elevated forced outage rates signal supply tightness and can lead to price spikes or reliability concerns.
How to read the signal:
- Green – Diversified & Available: The grid has a balanced mix of fuels with growing renewable share and low forced outage rates. Indicates robust supply and lower risk of price shocks.
- Yellow – Shifting mix / Rising outages: Dependence on a single fuel is increasing, or planned and forced outages are slightly above normal. Suggests monitoring for potential supply constraints and price volatility.
- Red – Concentrated mix / High outages: Generation relies heavily on one fuel (e.g., gas) and forced outage rates are high. Signals tight capacity margins and heightened risk of price spikes or reliability events.
Sources: ISO generation mix dashboards, monthly outage reports from ISOs or NERC, and fuel-specific outage data from market monitors.
