[6] On 10 January 2020, the chair of the board announced that Tim Cosgrove had been appointed as the new chief executive, to commence in early April.

[8] The Commerce Commission publishes a wide range of Information Disclosure data provided by Marlborough Lines.

The Havelock Town Board and Picton Borough Council had set up their own electricity supplies in 1917 and joined the MEPB in 1926 and 1947 respectively.

[10] Engineers considered multiple sources of generation for the MEPB, before deciding on a one-megawatt hydroelectric station on the Waihopai River, 40 km (25 mi) southwest of Blenheim.

A £300,000 loan to construct the power station, transmission and distribution infrastructure and the wiring of consumer's premises was approved by ratepayers on 11 October 1924.

[13] In January 1945, a transmission line from Springlands to Stoke was completed, connecting the MEPB to Nelson and onward to the Cobb Power Station.

The Tory Channel span gain notoriety in October 1985 when it was struck by an Air Albatross Cessna 402, resulting in the death of eight of the nine people onboard.

[10] The subtransmission network is made up of 308 km (191 mi) of 33 kV lines and cables interconnecting the Blenheim grid exit point with sixteen zone substations.

The distribution transformers step the voltage down to 230/400 volts to feed customers via 871 km (541 mi) of low-voltage lines and cables.

After Marlborough was connected to the rest of the South Island grid in 1955, the need for the generators was greatly reduced and they were relegated to reserve use.

Critics questioned whether an electricity lines company, as a regulated natural monopoly, had the skills required to produce, process and market wine internationally in a competitive and high risk industry.

[24] Months after he quit the company, a suppression order lifted, revealing Peter Yealands had been prosecuted along with two former senior staff for covering up the addition of sugar to post-fermentation wine that was destined for Europe.

[26] At the annual reporting meeting of the Marlborough Electric Power Trust in December 2021, there was controversy about the investment in Yealands because it had not paid a normal dividend for two years.

[27] In August 2022, Marlborough Lines announced that it was looking to divest part of its holdings in the Yealands group, in order to fund renewable energy developments and meet expected new electricity demand.

[28][29] Marlborough Lines was still trying to sell a stake in Yealands in late 2023, and faced controversy over the poor financial performance of the wine company.

[30] In the 2024 elections for the members of the Marlborough Electric Power Trust, three candidates who had campaigned on issues associated with Yealands were successful, deposing the current chairperson.