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Iberdrola paid £4.2 billion, including debt, for Electricity North West in 2024, about 1.44 times its £2.9 billion regulated asset value. MCC Economics finds the price sits within the range of past UK utility deals, but the value to Iberdrola rests on network synergies and on fixing the company's expensive embedded debt.
Iberdrola has owned 88 per cent of Electricity North West Limited (ENWL) since October 2024. It paid £2.1 billion (€2.5 billion) for the equity, in a deal that valued the whole company, including debt, at about €5 billion (£4.2 billion). A consortium of Japanese investors led by Kansai Electric Power kept the other 12 per cent.
MCC Economics was asked by a large investor to carry out due diligence on a UK monopoly network company to support a merger and acquisition transaction. This note draws on that work.
ENWL is the regulated electricity distribution network operator for North West England, covering Greater Manchester, Lancashire and Cumbria. It describes itself as serving five million customers in 2.4 million premises, and Iberdrola puts its reach at almost five million people and about 60,000 km of network. ENWL reported revenue of £598.1 million for the year to 31 March 2024.
The sale was agreed on 2 August 2024 through a share sale and a cash capital increase. Wood Mackenzie reports that Iberdrola bought 85.6 per cent for £1.7 billion and then injected £400 million to reach its 88 per cent holding. Iberdrola notified completion on 22 October 2024.
The deal made the United Kingdom Iberdrola's largest market by regulated asset base, at about €14 billion against €13.3 billion in the United States. It also made Iberdrola the second largest electricity network operator in the country, serving around 12 million people over more than 170,000 km of lines.
Table 1. Electricity North West transaction at a glance
It sits at the upper end of the range but inside it. The regulatory asset value (RAV) is the value Ofgem places on a network's past investment, and it is the base on which the regulator allows a return. At 1.44 times, Iberdrola paid £1.3 billion more than the £2.9 billion RAV shown in its analyst presentation.
A buyer pays above RAV when it expects to earn more than the allowed return, through cost and incentive outperformance, cheaper finance or growth. UK network assets have done this for years. Figure 1 plots the ratio of enterprise value to regulated asset base for water, energy network and airport transactions between 2000 and 2018. Most deals after 2005 priced between about 1.1 and 1.5 times, and a few, such as Dee Valley Water and Phoenix, went higher. On that evidence Iberdrola's price is not out of line, although several features of ENWL made the valuation harder.
Figure 1. Enterprise value to regulated asset base ratios in UK utility and airport transactions, 2000 to 2018
Four issues decided what ENWL was worth: its expensive embedded debt, its past warnings about financeability, the strength of its return on equity, and the synergies open to Iberdrola. Figure 2 sets out each question with a short answer.
Figure 2. The four valuation issues in the Electricity North West transaction
Because Ofgem funds debt at a sector-wide benchmark, while ENWL's actual debt, including index-linked swaps, costs more than that benchmark. The argument is long-running: ENWL was already pressing Ofgem on financeability in 2010, during the RPI-X@20 review, Ofgem's rethink of how energy networks are regulated.
When deciding whether to fund ENWL's actual cost of debt in the RIIO-ED2 price control for 2023 to 2028 (RIIO stands for Revenue = Incentives + Innovation + Outputs), Ofgem pointed to inefficiency and the risk to consumers and kept a single allowance for the sector. Moody's had warned years earlier that index-linked swaps may create risks for UK regulated utilities: they ease cash costs in the short term but leave companies exposed when interest rates and inflation move against them.
For a buyer the question is who carries the extra cost. If the inefficiency stays with the business under new ownership, the price should be lower. If the new owner can refinance or restructure the debt through a larger group balance sheet, the penalty largely falls away.
It has raised them. In its July 2021 draft RIIO-ED2 business plan, ENWL said its plan was not financeable under Ofgem's proposed framework, because the allowance for debt did not reflect its higher actual cost of debt. Its December 2021 final plan asked for an alternative cost of capital that would recognise differences in embedded debt costs across the sector.
Regulators have not accepted this argument. Ofgem declined company-specific debt allowances in its RIIO-2 final determinations and again in RIIO-ED2. In October 2021 the Competition and Markets Authority (CMA) dismissed the cost of debt appeal brought by gas distributor Wales & West Utilities (WWU), an appeal on which ENWL had applied to intervene. The CMA's reasoning confirms a settled principle: companies bear the cost of their own financing choices.
Yes. ENWL's Regulatory Financial Performance Report (RFPR) for 2024 shows a solid return on regulatory equity (RoRE), supported by total expenditure (totex) outperformance, tax and rewards under the Interruptions Incentive Scheme (IIS), which pays networks for fewer and shorter power cuts.
High inflation in recent years has also helped, because ENWL's inflation-linked debt structure gives it an improved debt-funding position when inflation is high. That has softened, for now, the weakness described above.
More valuable to Iberdrola than to any other bidder. ENWL sits directly between ScottishPower's two distribution licence areas: central and southern Scotland to the north, and Merseyside, Cheshire and North Wales to the south (Figure 3). That makes Iberdrola a natural buyer, with scope to share control rooms, field teams, procurement and investment planning across adjacent networks.
The combined footprint also gives Iberdrola a larger stake in the growth of electricity demand as heating and transport move off fossil fuels. Those gains are available to Iberdrola in a way they are not to a financial investor, which explains why it could justify a higher price.
Figure 3. Iberdrola's three adjacent distribution licence areas in Great Britain after the acquisition
Iberdrola beat a consortium of Engie and Caisse de dépôt et placement du Québec (CDPQ) after other interested parties dropped out. When ENWL's shareholders opened the sale in spring 2024, Engie, CDPQ and a consortium of KKR and the Dutch pension fund APG were all reported to be preparing bids. Macquarie had earlier been named as a possible bidder.
By July 2024, KKR had withdrawn and Engie and CDPQ had joined forces against Iberdrola in the final round. Iberdrola, which had also looked at ENWL when it was last sold in 2019, won with its August 2024 offer.
ENWL has changed hands at a premium before. North West Electricity Networks, advised by Colonial First State and J.P. Morgan Asset Management, bought the business from United Utilities in 2007 at an enterprise value of £1,782 million, which MCC Economics estimates at about 1.45 times RAV. In 2019 a Kansai-led consortium and Equitix bought 50 per cent and later that year, with CNIC, the remaining 50 per cent. The price for the 2019 transactions was not disclosed. Table 2 sets out the history.
Table 2. Ownership of Electricity North West, 2007 to 2024
Probably not, provided it delivers the synergies and brings down ENWL's cost of debt. On ENWL's standalone results a multiple of 1.44 looks steep. Once the savings from running three adjacent networks and the scope to refinance legacy debt are counted, the price is in line with comparable UK transactions.
For the sellers the timing was good. Equitix and its partners, including the Kansai-led consortium that kept 12 per cent, sold after about five years at a clear premium to RAV.
The CMA cleared the acquisition on 20 March 2025. On 4 August 2025 ENWL began trading as SP Electricity North West, taking the ScottishPower brand alongside Iberdrola's other UK networks. The underlying valuation questions remain the same: whether the synergies arrive and whether the cost of debt falls when the next price control is set.
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