A Section 16 connection offer is the statutory mechanism through which a DNO is legally obliged to offer you a grid connection on specific terms. Understanding what triggers the offer, what it must include, and what your rights are if the terms are unfair is essential for any renewable energy developer navigating the UK grid connection process.
Introduction
When renewable energy developers talk about "getting a connection offer" or "applying to the DNO for a connection," they are usually referring to a process rooted in Sections 16 and 16A of the Electricity Act 1989. These two sections create both the legal right to a grid connection and the formal procedure through which that connection is offered, negotiated, and accepted. Despite being the foundational legal framework for UK grid connections, the statutory basis is rarely explained in accessible terms. This article does that, covering what a Section 16 offer is, how to request one, what it must contain, and what you can do if the terms are not reasonable.
What is a Section 16 connection offer?
A Section 16 connection offer is the formal written offer of terms for a grid connection, made by a Distribution Network Operator (DNO) under the Electricity Act 1989. It is a statutory instrument: the DNO is legally required to make it, and if accepted within the specified timeframe, it creates binding obligations on both parties.
The offer is distinct from informal budget estimates or indicative quotes, which some DNOs provide as a pre-application service. A budget estimate is a desktop assessment with no legal weight. A Section 16 offer is the formal stage: it sets out the exact terms on which the DNO will make the connection, including the works required, the cost, the connection date, and the access type (firm or flexible).
The term "Section 16 offer" is industry shorthand. Technically, the duty to connect sits in Section 16, while the procedure for requesting and receiving the formal offer is set out in Section 16A. The two sections work together.
The statutory basis: Sections 16 and 16A of the Electricity Act 1989
Section 16 of the Electricity Act 1989 establishes that an electricity distributor is under a duty to make a connection between its distribution system and any premises when required to do so by the owner or occupier of those premises, or by an authorised supplier acting with their consent (Electricity Act 1989, s.16). The duty extends to providing whatever electric lines or electrical plant are necessary to make the connection usable.
This is a genuine statutory right. A DNO cannot simply decline to offer connection terms. If it fails to respond, the developer has recourse through Ofgem.
Section 16A provides the mechanism for exercising that right. It sets out the procedure a developer must follow to request an offer, what information the DNO can ask for, what the offer itself must contain, and what dispute resolution is available. Section 16A was inserted into the Act in its current form by the Utilities Act 2000, and has been amended several times since, most recently by the Energy Act 2008 (which introduced the ability for DNOs to charge connection offer expenses) and the Planning and Infrastructure Act 2025 (Electricity Act 1989, s.16A).
How to trigger a Section 16 offer: what your notice must include
To trigger the formal offer process, a developer must give the DNO a written notice under Section 16A(1). The Act specifies that this notice must state three things:
- The premises or distribution system to which the connection is required.
- The date on or by which the connection needs to be made.
- The maximum power at which electricity may need to be conveyed through the connection (in practice, this is the proposed export capacity of your generation asset).
The DNO can then request any other information it reasonably needs to assess the connection, and the developer must provide it. Since the Energy Act 2008, DNOs have also been permitted to charge connection offer expenses, meaning reasonable costs incurred in preparing the formal offer, subject to regulations (Electricity (Connection Offer Expenses) Regulations 2018).
A practical point worth noting: many DNOs have online application portals and standard forms that capture this information automatically. Submitting via the portal effectively triggers the Section 16A process, even if the statutory language is not referenced explicitly.
What the connection offer must contain
Once the DNO has received the Section 16A notice and any additional information requested, it must issue a formal written offer. Under Section 16A(5), that offer must:
- State the extent to which the developer's proposals are acceptable, and set out any counter-proposals from the DNO (for example, a different connection point or a lower export capacity).
- Specify any payment the developer will be required to make under Section 19(1) of the Act, covering connection charges and any contribution to reinforcement costs.
- Specify any security the developer must provide under Section 20 (typically a deposit to confirm commitment).
- State any other terms the developer will need to accept under Section 21 (which covers ongoing conditions of connection, such as metering requirements or technical standards).
- Contain a statement of the effect of Section 23, which is the dispute resolution provision.
In plain terms, the offer tells you: where exactly you will connect (your point of connection), how much your grid connection will cost, what works are required, when the connection will be ready, and whether the access is firm or flexible.
Timescales: how long does the DNO have to respond?
The Act requires the DNO to issue the formal offer "as soon as practicable" after receiving the Section 16A notice and any requested information. In practice, Ofgem's licence conditions and published service standards require DNOs to issue connection offers within 45 working days for standard distribution-level connections (Ofgem, 2024).
In practice, reported timescales range considerably. Straightforward low-voltage connections in unconstrained areas can come back faster, sometimes within two to three weeks. More complex connections, particularly those involving reinforcement design or constrained substations, frequently run to the full 45-day limit or beyond. In July 2024, with the connection queue running at approximately 726 GW across transmission and distribution (Energy Networks Association, 2024), delays beyond the statutory standard were common in heavily congested DNO areas.
The 45-working-day clock starts from receipt of the complete notice and all reasonably requested information. If a developer submits an incomplete application, the clock does not run until the missing information is provided. This is a practical reason to submit detailed applications in a single submission rather than in stages.
Accepting the offer: how to respond and what happens next?
Once the formal offer is received, the developer typically has around 90 days to accept it (standard across most DNOs, though the exact period is set by the individual DNO's commercial terms rather than the statute itself). Accepting the offer without modification means the terms become a binding contract.
One important exception applies where a connection is classified as interactive, meaning two or more applications are competing for capacity on the same part of the network. In those cases, the acceptance window can be as short as 30 days, because the DNO needs a faster decision to manage the queue fairly. Developers in constrained areas, where interactive offers are more common, should check the validity period on the face of their offer rather than assuming the standard 90-day window applies.
After acceptance, the typical sequence is:
- The developer pays any required deposit or security under Section 20.
- The DNO programmes the connection works within its capital works schedule.
- The developer commissions the generation asset and arranges for metering and commissioning.
- The generation unit is energised and begins exporting to the grid.
If the developer wants to negotiate changes to the offered terms (for example, requesting a different connection voltage or querying the reinforcement cost allocation), this must happen before acceptance. Once accepted, the terms are fixed unless both parties agree otherwise.
The offer will also specify whether the connection is firm or flexible. Where the offer is for a non-firm (flexible) connection, it must be accompanied by a curtailment report estimating the likely frequency and extent of export restrictions. This requirement flows from Ofgem's Access SCR reforms, implemented from April 2023 (Ofgem, 2023).
What if the terms are unreasonable? Section 23 and Ofgem referrals
Section 23 of the Electricity Act 1989 is the developer's key protection against unreasonable connection terms. It allows any party to refer a dispute about the terms of a connection offer to Ofgem for determination, if the parties cannot reach agreement between themselves.
Grounds for referral include disagreement about the connection charge, the level of reinforcement costs allocated to the developer, the connection date, or the technical terms. Ofgem's disputes team can determine what reasonable terms should be and direct the DNO accordingly.
The Section 16A offer is required to include a statement explaining this right, precisely so that developers are aware they have recourse beyond simply accepting or declining the offer as written.
In practice, formal Section 23 referrals are relatively uncommon. Most disputes are resolved through commercial negotiation. However, the existence of the referral mechanism gives developers a meaningful backstop, particularly where a DNO proposes to allocate a large proportion of reinforcement costs to a single developer rather than treating them as shared network investment. Ofgem has published guidance on its determinations process, and further dedicated guidance for disputes arising from the 2024 to 2026 connections reform is expected (Ofgem, 2026).
Section 16 offers in the context of 2026 grid reforms
The Section 16 framework is the bedrock of UK grid connection law, but the policy environment around it has changed substantially. The 2024 to 2026 connections reform programme, driven by Ofgem and the National Energy System Operator (NESO), has overhauled how projects enter and move through the connection queue. Under the reformed system, projects must pass readiness criteria (Gate 2) before securing a confirmed connection date and cost (NESO, 2025).
Two amendments to Section 16 itself are also relevant. The Planning and Infrastructure Act 2025 inserted Section 16(2A), which requires DNOs to have regard to "designated strategic plans" when deciding how to prioritise connection requests. This reflects the policy shift toward connection queues being managed strategically (in alignment with national energy planning) rather than simply on a first-come, first-served basis. A further amendment from the same Act inserted Section 16(6), which defines what "designated strategic plans" means in this context.
The Section 16 statutory offer process remains the legal mechanism through which formal connection terms are issued, regardless of how the queue is managed. A project that has passed Gate 2 and been allocated a connection slot will still receive, and need to accept, a formal Section 16A offer before works proceed.
How Feasibly can help
Understanding where a site sits in relation to the local distribution network is essential before triggering the Section 16A process. If a substation is heavily constrained, the terms offered (including the cost of reinforcement and the likelihood of a flexible rather than firm offer) will reflect that constraint. If capacity is available, the offer will typically be simpler and cheaper.
Feasibly's platform queries live DNO capacity data and heat maps, allowing developers and community groups to assess the connection landscape for a given site before committing to the formal application process. Knowing whether you are likely to receive a firm or flexible offer, and roughly what reinforcement might cost, allows you to frame your Section 16A notice more strategically and assess the commercial viability of a site before incurring formal application costs.
Conclusion
A Section 16 connection offer is not just an administrative step in a long process. It is a legally binding document, grounded in the Electricity Act 1989, that fixes the terms on which your project will connect to the grid. The statutory framework gives developers a genuine right to connect, a defined process for requesting an offer, and a route to Ofgem if those terms are unreasonable.
The practical implications are significant. Knowing what your Section 16A notice must include, what the offer must contain, how long the DNO has to respond, and what your options are if the terms are unfair puts you in a materially stronger position when navigating the grid connection process. In a market where connection delays and cost uncertainty remain significant barriers to project delivery, that knowledge is not a technical nicety: it is a commercial necessity.