6 min read ยท July 5, 2026

Index vs. Structured Block vs. Portfolio vs. Fully Fixed

There's no single 'best' contract โ€” only the one that fits your load shape and how much market risk your finance team can stomach.

Index vs. Structured Block vs. Portfolio vs. Fully Fixed

Index

The settlement price passed straight through with a transparent adder. You capture market dips and pay less in soft markets, but you carry the volatility.

Structured block

Secure most of your load at a fixed price and float the balance, in a ratio you set. Certainty on the base, exposure only on the remainder.

Portfolio

The same structure, built to flex, with site IDs added or removed at no cost across every location. One agreement that grows with you.

Fully fixed

One secured rate for the entire term, zero market exposure. Budget certainty with no usage-band penalty.

Which should you choose?

  • Need predictable budgets and hate surprises? Lean fully fixed.
  • Have flexible load and appetite for risk? Consider index.
  • Want a balance you can tune? A structured block is often the sweet spot.
  • Running many sites? Portfolio keeps the structure and drops the admin.

The right answer depends on your load factor, volume and how your business plans around cost. A specialist can model each structure against your actual consumption.

Ready for real contract options? Get my custom quote.

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