For this Expert Insight, The MEP Source partnered with a Utilities Procurement Manager from a major UK contractor to provide grounded, real-world perspectives on the commercial and operational challenges of multi-utility strategies in today’s construction landscape.
As infrastructure delivery grows more complex and margins tighten across construction and development, the world of utilities is undergoing a quiet revolution. Gone are the days when statutory providers (the traditional Distribution Network Operators or DNOs) held all the cards. Today, developers and contractors are increasingly turning to multi-utility partnerships, including Independent Distribution Network Operators (IDNOs) and New Appointment and Variations (NAVs), in a bid to unlock better commercial value, accelerate delivery, and manage risk more effectively.
But with the withdrawal of long-standing incentives—particularly the Income Offset—and mounting confusion about asset values, rebate schemes, and compliance requirements, many project teams find themselves navigating unfamiliar territory. So, do IDNOs and NAVs really help de-risk projects, or are they simply a new layer in an already challenging environment? Let’s explore.
The Decline of Statutory Incentives
Historically, developers could count on a financial contribution from statutory service providers to offset the cost of installing new infrastructures. For water services, this was known as the Income Offset—a deduction applied to network charges that helped to reduce capital expenditure. However, in April 2023, Ofgem’s Significant Code Review (SCR) brought that benefit to a close.
“Frankly, the removal of the Income Offset turned the entire economic model for utilities on its head,” says a utilities procurement manager for a major contractor. “Developers who previously relied on this contribution are now being hit with the full cost of the works as well as a significant hike on infrastructure charges. That’s why multi-utility partnerships are gaining ground—they offer a way to claw back value that statutory providers no longer deliver.”
The shift has also thrown a spotlight on asset values (AV) —the amount an IDNO or NAV is willing to pay a developer to adopt and operate the newly installed network. This “asset value” is now one of the few remaining levers for commercial gain in the utility space, but it requires specialist knowledge to optimise.
IDNO vs. DNO: Understanding the Difference
At the heart of this new utility landscape is the rise of IDNOs, who operate in competition with the traditional DNOs. While DNOs own and maintain the regional distribution networks, IDNOs are licensed by Ofgem to own and operate new networks, typically within housing or commercial developments.
The key advantages of using an IDNO over a DNO include:
- Asset payments: IDNOs typically offer more favourable financial solution, providing asset value payments for the adoption of networks.
- Rebate schemes: Many IDNOs operate structured rebates or incentives for developers who deliver volumes or engage early.
- Flexible commercial models: Unlike DNOs, which follow strict charging structures, IDNOs can negotiate commercial terms that benefit developers.
“Using an IDNO on our recent residential development netted us a six-figure asset value rebate. That was cash back into the project that wouldn’t have been available through the DNO.”
NAVs, meanwhile, play a similar role in the water and wastewater sectors, offering an alternative to the local statutory water companies. Like IDNOs, they are incentivised to compete on price and service, often with shorter lead times and more flexible commercial and programme terms.
The Process: Timing, Tendering and Streamlining
Working with an IDNO or NAV requires a shift in approach compared to the traditional statutory route. Early engagement is critical, as decisions around utility strategies must be locked in before groundworks begin.
Key stages in the process:
- Design and Load Assessment: Confirm maximum demand profiles, including diversity factors for residential and mixed-use schemes.
- Tendering the Connection: Issue a connection tender to multiple IDNOs (and DNO for comparison), ideally through a utilities consultant or multi-utility provider.
- Evaluating Offers: Assess connection charges, asset values, and proposed rebate schemes.
- Finalising Adoption Agreements: Once an IDNO is selected, formal adoption agreements are signed, and the installation progresses under their oversight.
- Commissioning and Asset Transfer: On completion, the IDNO adopts the network and begins earning regulated revenues, which funded the initial rebate to the developer.
This process can also be streamlined by engaging multi-utility providers who act as a single point of contact across electric, water, gas, and even fibre, further simplifying coordination and ensuring infrastructure delivery aligns with programme milestones.
Rebate Schemes: Commercial Leverage or Risk Trap?
Rebate schemes from IDNOs and NAVs often look attractive on paper. These can range from fixed lump sums based on kVA delivered to volume-based schemes that reward developers for bringing multiple projects to a single provider. However, unlocking their full value requires a strong understanding of the regulatory framework and commercial triggers.
“There’s a misconception that rebates are guaranteed,” warns our partner. “In reality, many are conditional on timely delivery, specific technical standards, or long-term use assumptions. If you don’t meet the criteria, there is a potential risk of losing the rebate altogether.”
To avoid this, developers are increasingly relying on specialist utility consultants or framework agreements with trusted IDNOs/NAVs to ensure rebate structures are legally watertight and aligned with project goals.
Risk Management: Does It Really De-Risk the Project?
One of the most hotly debated topics in utility procurement is whether using an IDNO or NAV actually de-risks a project.
On the one hand, these operators are often more responsive, commercially aligned, and able to commit to tighter delivery programmes. With many projects now constrained by grid availability or complex Section 50 and Section 104 agreements, speed and flexibility are a significant advantage.
“IDNOs and NAVs have a commercial incentive to deliver quickly—they’re not bogged down by the same bureaucracy as the statutory bodies. In that sense, they do reduce risk on delivery timelines and handover.”
However, it’s not a silver bullet. There are still dependencies on the statutory networks for upstream connections—meaning an IDNO can only go as fast as the DNO allows in energising the main connection point. The same applies to NAVs waiting for asset vesting with the incumbent water authority.
“In many cases, the final energisation date still hinges on the DNO’s availability, so even with an IDNO, if the statutory provider’s programme slips, yours probably will too.”
Conclusion: A Strategic, Not Tactical, Decision
Multi-utility delivery through IDNOs and NAVs has moved from being a niche option to a strategic lever for developers and contractors. With the erosion of traditional incentives like the Income Offset and ever-increasing pressure on infrastructure delivery timelines, these alternatives offer much-needed flexibility and commercial benefit.
But they must be approached with diligence.
“Choosing the right utility partner isn’t just about price,” concludes the Utilities Procurement Manager. “It’s about understanding the whole risk profile—from regulatory compliance to delivery reliability and post-handover support. When done right, using an IDNO or NAV can genuinely unlock value and reduce risk. But if you go in blind, you could find yourself stuck with delays, clawbacks, or missed rebates.”
As the construction industry adjusts to this new landscape, savvy teams are embedding multi-utility strategies at the heart of their planning—ensuring they’re not just reacting to statutory constraints, but actively managing and mitigating them.
Did you enjoy this article? Please get in touch if you would like to sit and discuss a topic and have you company featured (optional) on the next episode of The Expert Insight Series with The MEP Source enquiries@themepsource.com.
For more insights, industry interviews, and MEP strategies, explore the full Expert Insight Series here.
