Ofgem Data Best Practice Guidance
Ofgem's Data Best Practice Guidance sets the data obligations of Great Britain's energy network licensees. Published in November 2021 and applied through licence conditions under the RIIO price controls, its defining principle is that Energy System Data is "presumed open" — a licensee must publish unless it can justify withholding. It is an open-data mandate aimed at network operational data rather than at consumer data, and it is the reason British distribution networks publish better than the utilities of any mandated market studied.
Countries
Where this binds. Each links to the providers apis.io has catalogued there.
Regions
Industries
Each links to that industry as a scored cohort — so the question "how ready is this sector for the regime that governs it?" becomes one you can actually look at.
Implemented by these standards
A regulation is the law; a standard is the machine-readable contract that satisfies it. Almost every regime in this catalog restricts an interface rather than requiring one — where a standard exists, it is the part a provider can actually publish.