The thing is, though, you didn’t. You’re buying power from the grid¹, and the generators are selling it to the grid². The contracts between the grid operator and the generators may be useful evidence that they can meet your requirements, but ultimately, those contracts are about what goes into the wires at the head end. You don’t care about that. You care about what comes out of the wires where they enter your panel.
And that is something that needs to go into your contract with the grid operator, for - among other reasons, but this is the big one - purposes of standing. Even if the contracts between other parties imply things to your satisfaction, you aren’t a party to those contracts. When there’s a contract between Party A and Party B, you, Party C, have no legal standing whatsoever to enforce that contract³, and if an A/B default bites you, C, in the ass, your total recourse is standing around with your thumb up it.
Ain’t no-one there going to happy with that situation. You don’t buy goods and services without a clear definition of what those goods and services actually are - “continuous <= 250A load at four nines reliability, otherwise per IOSS 3864” - 'cause that’s unenforceable crazy talk. If you’re paying real, defined money for a thing, it had better be a real, defined thing.
(I mean, on Earth, humans sign bizarrely ill-defined, open-ended contracts all the time, but humans aren’t very good at this sort of thing. A contract is supposed to reflect a meeting of the minds, and if you’re not specific about the details, then there’s a very good chance that you don’t have one.)
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Simplifying for the purposes of illustration the details of the ampere spot market and demand aggregators.
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Simplifying for the purposes of illustration the details of local generation feeding back to the grid.
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Leaving aside some specific language which deliberately creates enforceable rights for third-party beneficiaries, but that’s not relevant to this case.