Bulb Energy
Bulb Energy was a British renewable-focused household energy supplier that entered special administration in 2021 and was acquired by Octopus Energy in 2022.
Last updated August 25, 2026
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Overview
Bulb Energy Ltd, commonly branded as Bulb, was a United Kingdom energy supply company founded in 2013 by Amit Gudka and Hayden Wood. It entered the market as a digitally oriented supplier offering household electricity and gas, with a proposition centered on renewable electricity and carbon-neutral gas. Bulb became one of the most prominent challengers to the established large suppliers in the British energy market, combining a relatively simple tariff structure with online account management and messaging focused on renewable generation. The company was incorporated under the name Regent Power Ltd and later operated as Hanbury Energy Ltd before adopting the Bulb identity. Its early financing came from the founders and their personal networks, followed by investment from JamJar Investments. In 2018, Bulb raised a further £60 million from DST Global and Magnetar Capital. The funding supported a rapid expansion in customers, staff and geographic ambition. By early 2019, the company had more than one million customers and over 550 employees. It was reported as the United Kingdom's largest renewable energy supplier in 2018 and the country's seventh-largest energy supplier, having achieved that scale without relying on acquisitions of other suppliers. Bulb's energy proposition used renewable electricity backed by wind, solar and hydroelectric generation. Its gas product was described as carbon neutral, consisting of a smaller biogas component alongside carbon offsetting. The company expanded beyond the United Kingdom in 2019, announcing operations in France, Spain and Texas. Its UK headquarters moved from Shoreditch to Bishopsgate in London in February 2019. Co-founder Amit Gudka left Bulb's day-to-day operations in February 2021 to focus on a battery-storage business, while Hayden Wood remained associated with the company's leadership. Bulb's rapid growth was accompanied by continuing losses and dependence on external funding. The sharp increase in wholesale natural-gas prices in 2021 placed severe pressure on the company and other independent suppliers. Bulb sought financial support in September 2021, but investors declined to provide further funding. On 24 November 2021, the energy regulator Ofgem placed the UK business into the Energy Supply Company Administration regime. This was the first use of that special administration process for a UK energy supplier and reflected the regulator's view that Bulb was too large to be handled through the ordinary supplier-of-last-resort transfer process used for smaller failed companies. During administration, the UK business was operated with government-backed support while administrators and public authorities considered the future of its customers and operations. Teneo was appointed administrator of Bulb Energy Ltd, while Interpath was appointed in relation to its parent, Simple Energy. Bulb's overseas subsidiaries were not covered by the UK administration. The process involved substantial public financing and became a major issue in discussions about the cost of the 2021–2022 energy-market crisis. In October 2022, Octopus Energy announced an agreement to take on Bulb's approximately 1.5 million customers and 650 employees. The transaction was completed on 21 December 2022. Following that transfer, Bulb ceased to operate as an independent UK energy supplier. Its history is therefore closely associated with the rise of challenger energy companies, the commercial risks of rapid growth in a volatile wholesale market, and the development of the UK's special administration framework for failing energy suppliers.
History
Bulb Energy was incorporated in April 2013 under the name Regent Power Ltd. It was subsequently known as Hanbury Energy Ltd between June and October 2015 before operating under the Bulb brand. The company was founded by Amit Gudka, a former energy-market trader at Barclays, and Hayden Wood, a former management consultant. Its parent company was Simple Energy. The founders initially financed the business through their own savings and personal contacts. Later backing from JamJar Investments helped Bulb develop its consumer offering and expand its customer base. The company sought to distinguish itself from established energy suppliers through a simpler digital service and a renewable-energy proposition. Bulb supplied electricity backed by renewable generation and marketed its gas as carbon neutral through a combination of biogas and carbon offsetting. Growth accelerated from 2017. In August 2018, Bulb secured £60 million from DST Global and Magnetar Capital. Contemporary reports placed the company's valuation between £400 million and £500 million. In 2018, Bulb was described as the UK's largest renewable energy supplier and seventh-largest energy supplier overall. It was also identified by SyndicateRoom as the fastest-growing private company in the United Kingdom that year. By early March 2019, it had more than one million customers and employed over 550 people. Its London headquarters moved in February 2019 from Hanbury Street in Shoreditch to Bishopsgate in the City of London. Bulb expanded internationally in 2019, announcing operations in France, Spain and Texas. The overseas businesses were legally distinct from the UK operation and were not included in the UK special-administration process. In the 2018–2019 period, the company's renewable electricity supply was reported as comprising 73% wind power, 24% solar power and 3% hydroelectricity. Its carbon-neutral gas was described as 10% biogas and 90% carbon offsetting. The company continued to grow while operating at a financial loss. Its business model was exposed to wholesale energy-price movements because retail tariffs and customer pricing could not always adjust rapidly enough to reflect market conditions. In September 2021, a steep increase in wholesale natural-gas prices led Bulb to seek a bailout. Investors refused to provide additional funding, and Ofgem placed the UK business into the Energy Supply Company Administration regime on 24 November 2021. This was the first time a UK energy company entered that special administration framework. Unlike smaller failed suppliers, whose customers could generally be transferred to another provider through the supplier-of-last-resort process, Bulb was considered too large for that approach. Teneo was appointed administrator of Bulb Energy Ltd, while Interpath was appointed in relation to Simple Energy. The special-administration process allowed the government to provide financial support while the business was managed and options for transferring its customers and selling the operation were assessed. The UK government set aside substantial funding for trading and administration costs. Public estimates of the eventual exposure varied considerably because wholesale energy prices remained volatile and depended on the terms of any eventual transfer. In October 2022, Octopus Energy agreed to acquire Bulb's approximately 1.5 million customers and 650 employees. The transaction was completed on 21 December 2022. Government support was used to enable Octopus to procure energy for former Bulb customers during the winter following completion. The administration and financing arrangements subsequently became the subject of debate over taxpayer exposure and the cost of managing a large energy supplier failure. Bulb therefore ended as an independent brand after less than a decade of operation. Its development illustrates both the opportunity for renewable-focused challenger suppliers to gain market share quickly and the vulnerability of heavily growing suppliers to wholesale-price shocks, undercapitalisation and regulatory constraints on passing costs through to consumers.
- 2022
Octopus completes acquisition
[1]Octopus Energy completed the acquisition of Bulb's approximately 1.5 million customers and 650 employees on 21 December.
- 2021
Bulb enters special administration
[1]After seeking financial support during the wholesale gas-price crisis, Bulb entered the UK's Energy Supply Company Administration regime on 24 November.
- 2020
Customer redress agreed with Ofgem
[1]Bulb agreed to pay £1.76 million in redress, refunds and goodwill payments after regulatory findings concerning overcharging and other customer-service errors.
- 2019
One million customers and international expansion
[1]By early March, Bulb had more than one million customers and over 550 employees. It also announced expansion into France, Spain and Texas.
- 2018
Major venture funding and market expansion
[1]Bulb raised £60 million from DST Global and Magnetar Capital and was reported as the UK's largest renewable energy supplier and seventh-largest energy supplier overall.
- 2017
Rapid customer growth begins
[1]Bulb's customer growth accelerated, establishing it as a major challenger to incumbent UK energy suppliers.
- 2015
Name changes precede the Bulb brand
[1]The company operated as Hanbury Energy Ltd between June and October 2015 before adopting the Bulb identity.
- 2013
Company incorporated
[1]The business was incorporated as Regent Power Ltd and founded by Amit Gudka and Hayden Wood.
Products and positioning
A digitally focused challenger energy supplier positioned around renewable electricity, carbon-neutral gas, straightforward tariffs and customer service, rather than the complex tariff structures associated with traditional large suppliers.
Electricity supply · 2013
Renewable electricity
Bulb's core electricity product was marketed as renewable. For 2018–2019, the reported generation mix was 73% wind power, 24% solar power and 3% hydroelectricity. The offer formed the central part of Bulb's environmental positioning and helped the company appeal to households seeking an alternative to conventional fossil-fuel-oriented supply.
Gas supply · 2013
Carbon-neutral gas
Bulb marketed its gas supply as carbon neutral. The reported composition for 2018–2019 was 10% biogas and 90% carbon offsetting. This product extended Bulb's renewable-focused proposition into the gas market, where fully renewable supply was more difficult to provide at household scale.
Energy account and billing service · 2013
Digital energy service
Bulb operated as a digitally oriented supplier, using online account management and a relatively simplified customer proposition for household electricity and gas. Its digital service was part of the brand's attempt to offer a more straightforward alternative to the complex tariffs and administration associated with larger incumbent suppliers.
Brand decisions
2022
Transfer to Octopus EnergyM&ABackground
The special-administration process sought a way to protect and transfer Bulb's unusually large customer base.
Action taken
Octopus Energy agreed to acquire Bulb's approximately 1.5 million customers and 650 employees, completing the transaction on 21 December 2022.
Aftermath
Bulb ceased operating as an independent UK energy supplier, while its customers and staff moved to Octopus.
2021
Entry into special administrationOtherBackground
A sharp rise in wholesale natural-gas prices caused severe financial pressure. Bulb sought a bailout in September, but investors declined to provide further funding.
Action taken
Ofgem placed Bulb into the Energy Supply Company Administration regime on 24 November 2021.
Aftermath
Bulb became the first UK energy supplier to enter special administration and continued operating with government-backed support while a transfer or sale was arranged.
Government funding set aside for Bulb's trading and administration costs. £1.7 billion set aside (2021–2022 administration)
2019
International expansionStrategyBackground
After establishing a substantial position in the UK market, Bulb sought to extend its renewable-focused energy model beyond Britain.
Action taken
Bulb announced expansion into France, Spain and Texas.
Aftermath
The overseas subsidiaries were not affected by the later UK special administration, which applied to the UK business.
Sources1 sources
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