Ed Miliband has had two distinct political careers. The first ended with a general election defeat that exposed his weaknesses as a party leader. The second established him as one of Labour's most determined policy ministers. His strongest achievements are laws, institutions and investment decisions intended to reshape the energy system. His weakest result is the one households were meant to notice: cheaper bills.

How he rose

Miliband first gained real influence under Gordon Brown. As energy and climate change secretary, he oversaw the final passage of the Climate Change Act 2008 and accepted the Climate Change Committee's recommendation to raise the statutory 2050 emissions-reduction target from 60 to 80 per cent. The Act made Britain the first country to place long-term national climate targets in law.

In 2010 he defeated his brother David for the Labour leadership by 50.65 to 49.35 per cent. Ed trailed among MPs and ordinary party members but won through stronger support from trade union affiliates. That produced an immediate charge that he owed his position to the unions, although he later reduced their automatic influence by replacing Labour's electoral college with a one-member-one-vote leadership system.

As leader, Miliband pushed Labour away from New Labour's tolerance of lightly regulated markets. He attacked "predatory" capitalism, proposed a mansion tax and promised a temporary energy-price freeze. The freeze was never implemented because Labour lost office, but it changed the argument: a Conservative government eventually introduced an energy price cap after previously condemning the idea.

His leadership still failed its central test. At the 2015 general election, Labour won 232 seats and 30.4 per cent of the vote against the Conservatives' 330 seats and 36.9 per cent. Labour was almost wiped out in Scotland and made too little progress in England. Miliband resigned the following morning.

Keir Starmer returned him to the front bench in 2020 and gave him control of energy policy after Labour entered government in 2024. Andy Burnham moved him to the Foreign Office in July 2026. That appointment marked a complete political recovery, but it was only days old at the cut-off date and had produced no assessable result.

What he stands for

Miliband's consistent belief is that government should shape markets rather than wait for them to deliver public goals. In energy, that has meant public investment, renewable-power contracts, planning intervention, restrictions on new North Sea exploration and long-term state backing for nuclear power.

This is interventionist rather than conventionally socialist. Great British Energy is publicly owned, but much of Miliband's programme depends on private developers receiving guaranteed revenues. Sizewell C also uses private investment while transferring a substantial share of construction risk to consumers and taxpayers.

He has maintained his climate position when it became politically awkward. He did not follow Starmer's retreat from the original £28 billion annual green-investment pledge by abandoning the underlying programme. Instead, he used the smaller settlement to protect its central institutions and projects.

What he actually delivered

Within 72 hours of taking office in 2024, Miliband removed England's de facto ban on onshore wind. The planning change put wind projects on broadly the same footing as other energy developments. It was a completed policy reversal, although turbines normally take four to nine years to move from inception to operation, so the resulting generation remained limited.

His main institutional achievement was the Great British Energy Act 2025, which established a publicly owned company able to invest in, develop and own clean-energy projects. This went beyond branding. By May 2026, Great British Energy funding had helped complete solar installations at 225 schools and colleges and 162 NHS sites. However, the wider £8.3 billion allocation was a spending commitment, not money already converted into generating assets or public returns.

Miliband also redesigned renewable-energy auctions. Allocation Round 7 secured contracts for 8.4 gigawatts of offshore wind, the largest UK auction result to that point. It repaired a development pipeline damaged when the Conservatives' fifth round secured no offshore wind. These were contracts for future capacity, not operating wind farms.

His largest individual decision was approving Sizewell C. The project had been developed under previous governments, but Miliband signed the final investment decision and secured £14.2 billion of public funding. The National Audit Office put its baseline construction cost at around £38 billion and warned that the benefits were uncertain while the risks were immediate and substantially borne by the public. Consumers began paying before the plant produced electricity.

What he did not deliver

Labour said its clean-power programme would reduce typical household bills by up to £300 by 2030. That deadline had not passed, but the saving had not appeared. The Ofgem price cap was £1,862 in July 2026, compared with £1,568 when Miliband entered office in July 2024. International gas prices explain much of that movement, so it cannot fairly be attributed to him alone. It nevertheless leaves his central affordability claim unproved.

The same applies to clean power by 2030 and the Warm Homes Plan. Miliband produced plans, budgets and contracts, but most of the promised generation, home improvements, jobs and savings remained ahead of implementation when he left the department.

Capability judgement

Miliband has proved that he can build a department around a clear purpose, move legislation quickly and secure large investment decisions. Few ministers have left such a defined policy structure after two years.

He has not proved that this structure delivers cheaper energy, and Sizewell C shows a willingness to commit the public to enormous, uncertain costs. His record supports a reputation as an effective departmental strategist and persistent reformer. It does not erase his failure as Labour leader, nor does it justify treating forecasts, contracts and allocated billions as completed public benefit.