Business EV Charging Energy UK: How Charge Points Affect Your Energy Contract

How EV Charge Points Change Your Energy Profile

Workplace EV charging adds electricity demand that is concentrated in time: typically during morning arrivals (7am to 10am) when staff plug in, and potentially during the day if charge points are used by visiting fleet vehicles or customers. A single 7 kW AC charge point adds 7 kW to site demand when in use. Ten charge points operating simultaneously add 70 kW of instantaneous demand, which for many SME premises represents a substantial increase above existing peak load.

The key risk is peak demand concentration. If multiple staff arrive and plug in simultaneously, the site demand spike may exceed the existing Maximum Import Capacity (MIC) agreed with the Distribution Network Operator (DNO). MIC is the contracted maximum demand level for the supply point. Exceeding MIC triggers excess capacity charges on the electricity bill and may require a formal MIC upgrade, which involves a DNO application, potential reinforcement works, and a waiting period that can extend to months in constrained network areas.

Load management software and smart charging systems that stagger charge point output to prevent simultaneous full-power operation can substantially reduce peak demand impact. Smart charging is a technical requirement under the Electric Vehicles (Smart Charge Points) Regulations 2021 for charge points sold or installed in the UK. Smart-capable charge points have the ability to vary charging speed in response to grid signals or site management commands, allowing demand peaks to be flattened.

MIC Implications and Half-Hourly Settlement

Sites with electricity supply points above 100 kW Maximum Import Capacity are subject to mandatory half-hourly (HH) settlement. A business currently below the 100 kW MIC threshold that installs EV charging capacity sufficient to push peak demand above 100 kW triggers the obligation to upgrade to HH metering and settlement.

HH settlement introduces Time of Use (ToU) pricing elements, meaning peak-period consumption is priced higher than off-peak. For businesses with EV charging demand concentrated in the morning peak period, this can significantly increase the effective unit cost of charging. Scheduling smart charging to avoid peak ToU windows - typically 4pm to 7pm on weekdays - reduces this cost, though morning charging peaks may also attract ToU premiums depending on the supply contract structure.

Before installing charge points that will materially increase peak demand, the site's current MIC should be confirmed from the supply contract or DNO connection agreement. A qualified electrical engineer or DNO pre-application enquiry can confirm whether the planned installation will trigger an MIC upgrade requirement and estimate the cost and lead time of any reinforcement needed.

The Workplace Charging Scheme

The Workplace Charging Scheme (WCS) is a government grant programme administered by the Office for Zero Emission Vehicles (OZEV). It provides a contribution toward the upfront cost of purchasing and installing EV charge points at eligible business premises.

The scheme is open to eligible businesses, charities, and small accommodation businesses. The WCS has been extended for a final year until 31 March 2027, after which it closes permanently. As of 1 April 2026, the grant covers up to 75% of the purchase and installation cost, capped at £500 per charge point socket (raised from £350 effective 1 April 2026), with a maximum of 40 sockets per applicant. Applicants must use an OZEV-approved installer and charge points must meet the scheme's technical requirements including smart charging capability.

OZEV publishes the current WCS eligibility criteria, grant levels, and approved installer lists on gov.uk. Grant rates and eligibility conditions are subject to change; businesses should verify current terms directly with OZEV before proceeding. Application must be made before installation begins; retrospective applications are not accepted.

Energy Supply Contract Versus Charge Point Operator Arrangement

The energy supply contract and the charge point operator arrangement are legally distinct and must be managed separately. The energy supply contract is between the business and a licensed electricity supplier. It governs the purchase of electricity from the grid at the supply point. The charge point operator arrangement - if any - is a separate commercial relationship governing how charge point access is provided to users, how payments are collected, and how the charge point network is managed.

For workplace charging where the business provides free charging as an employee benefit, no charge point operator arrangement with a third party may be necessary. The business simply consumes additional electricity under its existing supply contract and bears the cost.

For businesses operating destination charging (for customers or public users) or wishing to monetise charge point access, a charge point operator (CPO) or electric vehicle service provider (EVSP) relationship is typically required. The CPO manages tariff setting, payment processing, and network management. The business provides the electricity and the physical space. Revenue sharing arrangements vary by CPO and should be reviewed carefully, particularly regarding who bears the cost of electricity at times of high wholesale prices.

Separate Metering for EV Charging

Where EV charging forms a significant proportion of total site electricity consumption, installing a sub-meter dedicated to EV charging allows accurate tracking of charging energy for cost allocation, VAT purposes, and employee benefit reporting. Without sub-metering, the EV charging contribution to total site consumption must be estimated, which is imprecise and may create compliance risk for employee benefit-in-kind tax reporting.

Sub-meters for EV charging are also relevant where the business wishes to charge employees or fleet managers for electricity consumed during workplace charging. HMRC publishes guidance on the tax treatment of employer-provided electric vehicle charging, including the conditions under which charging at the workplace is exempt from benefit-in-kind tax for employees.

Tax Treatment of Employee Charging

HMRC's guidance on company cars and benefit-in-kind taxation specifies that electricity provided by an employer to charge an employee's electric vehicle at the workplace is exempt from benefit-in-kind tax, provided the charging facility is available to all employees generally and not just a selected group. This exemption applies to both employer-owned and employee-owned vehicles charged at the workplace using employer-provided electricity.

Where an employer reimburses an employee for home charging costs, the tax treatment is more complex. HMRC's published advisory electricity rate for reimbursement of home charging for business travel is updated periodically and should be checked directly on the HMRC website before any reimbursement policy is established.

The Advisory Electricity Rate (AER) is used to calculate approved mileage allowance payments for electric company cars. Using a rate above the HMRC AER without evidencing actual energy costs creates a taxable benefit. Employers should confirm the current AER from HMRC before setting reimbursement policies.

How we verified this

This article draws on the Electric Vehicles (Smart Charge Points) Regulations 2021 as published on legislation.gov.uk, the Office for Zero Emission Vehicles Workplace Charging Scheme guidance published on gov.uk, HMRC guidance on the tax treatment of employer-provided electric vehicle charging, and Ofgem's half-hourly settlement framework. MIC and DNO application processes reflect the regulatory framework as published by Ofgem.

Frequently asked questions

Editorial disclaimer: The following questions address common points of uncertainty about EV charging and business energy contracts. They do not constitute electrical engineering, tax, or legal advice. Businesses should obtain professional advice specific to their premises and circumstances before proceeding.

How many EV charge points can I install before needing a MIC upgrade?

The answer depends on your current Maximum Import Capacity and the capacity of the charge points planned. Each 7 kW AC charge point adds up to 7 kW of potential simultaneous demand. If the total peak demand from charge points plus existing site loads would exceed your current MIC, a DNO upgrade application is required. Smart charging systems that stagger output can reduce peak demand below what unmanaged simultaneous charging would create, potentially avoiding or deferring an MIC upgrade. A qualified electrical engineer or DNO pre-application enquiry can confirm the position for your specific site.

Is the Workplace Charging Scheme grant still available?

The Workplace Charging Scheme administered by OZEV remains available but is in its final year, closing on 31 March 2027. From 1 April 2026 the grant rate rose to £500 per socket (up from £350), capped at 75% of purchase and installation cost, up to 40 sockets per applicant. The scheme is open to eligible businesses, charities, and small accommodation businesses. Eligibility criteria and approved installer requirements are subject to change. Applications must be submitted before installation begins. Current terms should be verified directly on the OZEV pages of gov.uk before proceeding.

Do I need a separate energy supply contract for my EV charge points?

Not necessarily. EV charge points installed at a business premises draw electricity through the existing supply point under the existing supply contract. If the charge points are sub-metered for internal cost allocation, no separate supply contract is required. A separate metered supply point is a distinct arrangement that may be worth considering for very large charging installations with consumption materially separate from the main business operation. This should be discussed with the DNO and the licensed supplier before installation.

Is employer-provided workplace EV charging a taxable benefit for employees?

HMRC guidance specifies that electricity provided by an employer to charge an employee's electric vehicle at the workplace is exempt from benefit-in-kind tax provided the charging facility is available to all employees generally. This applies to both employer-owned and employee-owned vehicles. Where the employer reimburses home charging costs, the tax treatment is more complex and depends on the purpose of the journey and the reimbursement rate used relative to the current HMRC Advisory Electricity Rate. Current HMRC guidance should be consulted directly before establishing any reimbursement policy.

What are smart charge point regulations and do they apply to my installation?

The Electric Vehicles (Smart Charge Points) Regulations 2021 require that charge points sold or installed in Great Britain for use in homes and workplaces must be capable of smart charging, meaning they can vary charging speed in response to grid signals or user/system management commands. This requirement applies to new installations. Charge points must also have randomised delay functionality to prevent synchronised demand spikes. Installers using OZEV-approved charge points under the Workplace Charging Scheme will typically supply compliant equipment as a condition of scheme eligibility.

Sources

• Workplace Charging Scheme - gov.uk/OZEV
• Electric Vehicles (Smart Charge Points) Regulations 2021 - legislation.gov.uk
• HMRC Advisory Electricity Rate - gov.uk
• Ofgem - Half-hourly settlement framework

For further reading on metering and demand management, see Half-Hourly Meters for Business UK and Business Electricity Standing Charges UK.