The Energy Commission (Suruhanjaya Tenaga, ST) issued its Battery Energy Storage System (BESS) Safety Guidelines, reference GP/ST/No.62/2026, under section 50C of the Electricity Supply Act 1990 [Act 447]. ST opened a feedback exercise on the document on 21 September 2026 under the title Feedback for Guidelines on Battery Energy Storage System (BESS) Safety, with a submission deadline of 5 October 2026. That deadline has passed. The commencement date is not in the document. Clause text reads: “These Guidelines shall come into operation on the date of the registration of these Guidelines.” The Registration Record table in the published PDF is blank, so the date of registration — and therefore the date the Guidelines take effect — cannot be read from the file. As of 2 November 2026, no announcement of a final or registered version appeared on ST’s homepage or the first two pages of its newsroom, which cover entries up to 30 October 2026. Scope is by application, not by size. Clause 2.1 applies the Guidelines to “Lithium-ion batteries used in Battery Energy Storage Systems (BESS)” and to any

Weekly brief: 20–26 October 2026. Five items from the past week, with dates and sources. Figures are as published by the source named; where the public record is ambiguous we say so rather than resolving it. 20 October 2026 — 12.3 GW of supply capacity approved for data centre projects. Deputy Prime Minister and Minister of Energy Transition and Water Transformation Datuk Seri Fadillah Yusof said in a written parliamentary reply that 12.3 GW of electricity supply capacity had been approved for data centre projects as of August 2026, and that the sector’s projected maximum demand is 8.39 GW by 2030. (The Star, 20 Oct 2026) 20 October 2026 — A 30% renewable requirement, and a self-generation framework with no stated date. In the same reply, Fadillah said data centres must source at least 30% of their total demand capacity from renewable energy, and that the Energy Commission is preparing a framework for self-generation facilities. The reply did not state when that framework will be issued. (The Star, 20 Oct 2026) 21 October 2026 — RM568.2 million substation contract from