Does a primary or scholarly source confirm that Texas kept its grid intrastate to avoid federal regulation under the 1935 PUHCA — and the 1976 'Midnight Connection' details?

Two linked historical claims — claim-texas-grid-isolation-1935-federal-regulation-dodge and claim-1976-midnight-connection-texas-oklahoma-forced-jurisdiction — both rest on a single Tier-3 source (KUT/NPR Austin, 2022). Historical claims on Tier 3–4 are acceptable when uncontested, but the sources.md floor says to escalate to Tier 1–2 when a claim is surprising or load-bearing. The "avoid federal regulation" origin is the analytical hinge of this whole thread and is mildly surprising, so it warrants corroboration.

Specific verifications needed:

• The 1935 PUHCA / regulatory-arbitrage origin. Confirm against a primary or scholarly grid history (e.g. an ERCOT/FERC official history, a Baker Institute or academic account, or the Public Utility Holding Company Act text and its jurisdictional trigger) that Texas utilities kept transmission intrastate specifically to stay outside federal jurisdiction — and that this, rather than engineering necessity, is the accepted explanation. Note that the Federal Power Act (1935) and the interstate-commerce jurisdiction it created are also part of this story; verify which statute is doing the work.
• The 1976 "Midnight Connection" specifics. Confirm the date (May 4, 1976), the Vernon, TX → Altus, OK route, the attribution to Central and South West Corp, its motive (to trigger federal jurisdiction), and that the Public Utility Commission of Texas ordered the connection cut off roughly a year later.
• Aftermath. What happened to Central and South West Corp afterward (the capture's unresolved lead), and who ordered the disconnection.

Why it matters: if corroborated, both notes can move toward budding; if the tidy "regulatory dodge" framing turns out to be a simplification of a messier history, the reframe that makes this thread hop-worthy needs qualifying.