Oklahoma sits inside the Southwest Power Pool (SPP), the regional transmission organization for the central United States. The state is served by OG&E and PSO in the metros, the Grand River Dam Authority in the northeast, and a dense network of rural electric cooperatives supplied through Western Farmers Electric Cooperative. The available fault current at any facility service is set by the serving utility and can shift when that utility upgrades transformers, ties, or substations, which is why short-circuit and arc flash studies should be revisited after any utility-side work.
Oklahoma does NOT operate a state OSHA plan for private-sector employers. Private workplaces answer to federal OSHA, which enforces electrical safety through 29 CFR 1910 Subpart S and treats NFPA 70E as the consensus standard for arc flash risk assessment and equipment labeling. State and local government employers participate in the Oklahoma Department of Labor PEOSH program. A current, PE-sealed arc flash study is the documentation a federal OSHA or PEOSH inspector or an insurance auditor expects to see.
The authority having jurisdiction for the installation itself is typically the local or county electrical inspection office enforcing the National Electrical Code as adopted in Oklahoma. Every study True Power Systems delivers in the state is modeled to current IEEE and NFPA methodology and sealed by a Professional Engineer licensed in Oklahoma.