EV Charging Energy Management: How to Control Costs and Maximise Efficiency
Installing EV chargers at your commercial property is only half the equation. Without a proper energy management strategy, the running costs of multiple chargers can quickly escalate — and in the worst case, they can overload your electrical supply entirely. For businesses across Manchester running four, ten or twenty chargers, the difference between a well-managed charging system and an unmanaged one can be thousands of pounds per year.
This guide explains the key energy management strategies available for commercial EV charging installations, how they work in practice, and how to choose the right approach for your property.
Why Energy Management Matters for EV Charging
A single 7 kW EV charger draws roughly the same power as an electric shower. Ten chargers drawing simultaneously is the equivalent of ten electric showers running at the same time. For most commercial properties, that level of simultaneous demand will exceed the available spare capacity on the existing electrical supply.
Without energy management, you face two options: install fewer chargers than your site needs, or pay for an expensive supply upgrade from the DNO. Neither is ideal. Energy management provides a third option — install the chargers you need and intelligently distribute the available power between them.
Beyond avoiding supply issues, energy management directly reduces your electricity costs. By shifting charging to off-peak periods, optimising how power is distributed, and monitoring usage patterns, businesses can cut their EV charging electricity costs by 30 to 50 per cent compared to unmanaged charging.
Load Balancing: The Foundation of EV Energy Management
Load balancing — also called dynamic load management — is the most important energy management feature for any multi-charger installation. It works by monitoring the total electrical load on your building in real time and adjusting the power delivered to each charger accordingly.
How Static Load Management Works
The simplest form of load management is static allocation. If your supply has 32 A of spare capacity and you install four chargers, each charger is permanently limited to 8 A regardless of how many vehicles are actually charging. This is simple and reliable, but inefficient — if only one car is plugged in, it still only receives 8 A when it could safely use the full 32 A.
Pros: Low cost, no additional hardware, simple configuration. Cons: Slower charging per vehicle, does not respond to actual demand.
How Dynamic Load Management Works
Dynamic load management uses a current transformer (CT clamp) on your incoming supply to monitor total building demand in real time. As existing loads fluctuate throughout the day — lighting, HVAC, equipment — the system automatically adjusts how much power is available for EV charging. If three out of four chargers are idle, the active charger gets the full available capacity. If all four are in use, the power is shared equally.
More advanced systems can also prioritise specific chargers. For example, a company director's vehicle could receive priority charging, or vehicles with lower battery levels could be prioritised over those already at 80 per cent.
Pros: Maximises charging speed, avoids supply overload, no wasted capacity. Cons: Requires CT clamp installation and compatible charger hardware. Adds £500–£2,000 to installation cost.
Recommendation: Dynamic load management should be considered the standard for any commercial installation with three or more chargers. The additional cost is recovered quickly through avoided supply upgrade charges.
Smart Charging: Scheduling and Tariff Optimisation
Smart charging goes beyond load balancing by adding time-based scheduling capabilities. This allows you to control when charging happens, not just how much power it uses.
Off-Peak Tariff Scheduling
Most commercial electricity tariffs have significant price differences between peak and off-peak periods. A typical business tariff in Manchester might charge 28p per kWh during the day and 12p per kWh overnight. For a fleet of ten vehicles each charging 40 kWh per session, that price difference translates to:
- Peak charging: 10 vehicles x 40 kWh x £0.28 = £112 per day
- Off-peak charging: 10 vehicles x 40 kWh x £0.12 = £48 per day
- Annual saving (250 working days): approximately £16,000
Demand Side Response
Some energy suppliers and aggregators offer demand side response (DSR) programmes that pay commercial EV charger operators to reduce or shift their charging load during periods of grid stress. The payments are modest — typically £50 to £200 per event — but they provide an additional revenue stream and contribute to grid stability.
Solar Integration
For properties with rooftop solar panels, smart charging can prioritise using self-generated solar electricity for EV charging before drawing from the grid. On a sunny day, a 50 kW solar array could provide free charging for seven or eight vehicles simultaneously. The payback period for solar panels is significantly shortened when the electricity is used for on-site EV charging rather than exported to the grid at lower feed-in tariff rates.
Monitoring and Reporting
Effective energy management requires visibility. Modern commercial EV charging systems provide detailed monitoring and reporting through cloud-based dashboards:
What to Monitor
- Energy consumption per charger — Track which chargers are used most and how much electricity each consumes per day, week and month.
- Cost per session — Understand the actual electricity cost of each charging session, including time-of-use tariff variations.
- Peak demand events — Identify when your building hits maximum demand, which directly affects your capacity charges (a significant component of commercial electricity bills).
- Charger utilisation — Measure what percentage of the time each charger is actively charging versus idle. Low utilisation may indicate chargers are in the wrong location or that bay-hogging is an issue.
- User patterns — Understand when employees arrive, how long they charge, and whether charging demand is concentrated in certain periods.
Reporting for Compliance
Energy monitoring data also supports your business's environmental reporting obligations. For companies reporting under SECR (Streamlined Energy and Carbon Reporting) or ESOS (Energy Savings Opportunity Scheme), EV charging consumption data must be captured and reported accurately.
Billing and Cost Recovery
For many commercial properties, recovering the cost of electricity used for EV charging is essential. There are several approaches:
Employee Charging
- Free workplace charging — Provided as an employee benefit. Note that from April 2025, the tax treatment of free workplace charging has been confirmed as a tax-exempt benefit, making this an attractive and simple option.
- Cost recovery — Charge employees at the actual electricity cost per kWh. Most networked charger systems support individual user accounts and automated billing.
- Subsidised charging — Charge employees a rate below the commercial rate but above zero, sharing the cost between employer and employee.
Visitor and Public Charging
If your chargers are available to customers or the public, you can set pay-per-use rates via the charger's network platform. Most operators charge between 40p and 65p per kWh for public access, which provides a healthy margin above electricity costs.
Payment processing is handled through the charger's app or contactless payment terminal. From January 2024, all new public charge points above 8 kW must have contactless payment capability — no app download required.
Tenant Charging
For multi-tenant commercial properties, sub-metering allows individual tenants to be billed for their actual EV charging consumption, either included in the service charge or billed separately.
Choosing the Right Energy Management System
The right system depends on your installation size and complexity:
| Scenario | Recommended Approach | |---|---| | 1–2 chargers, adequate supply | Basic timer scheduling, no load management needed | | 3–8 chargers, limited supply | Dynamic load management with CT clamp monitoring | | 8–20 chargers, mixed users | Full smart charging with load management, user accounts, billing | | 20+ chargers or fleet operations | Enterprise energy management with solar integration, DSR, fleet scheduling |
Cost Breakdown for Energy Management
| Component | Typical Cost | |---|---| | CT clamp and monitoring unit | £200–£500 | | Dynamic load management software licence (annual) | £100–£300 per charger | | Smart charging platform (annual) | £50–£200 per charger | | Solar integration controller | £1,000–£3,000 | | Sub-metering per charger | £150–£300 per unit |
Most commercial charger manufacturers — including Easee, Alfen, EVBox and Schneider — include basic load management capability in their hardware at no additional cost. Advanced features such as solar integration and DSR participation may require additional software subscriptions.
Manchester-Specific Energy Considerations
- Electricity North West network capacity — Some areas of Greater Manchester are experiencing grid capacity constraints as EV charging demand grows. Load management helps your installation coexist with the existing grid without requiring costly reinforcement.
- Greater Manchester Clean Air Zone — Businesses transitioning fleets to electric vehicles in response to air quality regulations benefit directly from optimised charging costs.
- Local electricity tariffs — Commercial electricity prices in Manchester vary by supplier and contract type. Economy 7 and time-of-use tariffs are widely available and can be exploited through smart charging schedules.
Get Expert Advice on EV Charging Energy Management
Designing an energy management strategy for your EV charging installation requires understanding your electrical supply, your tariff structure and your charging patterns. Our NICEIC approved electricians design and install energy-managed EV charging systems across Manchester and Greater Manchester.
Contact us for a free consultation:
- Call: 0161 706 1360 (Monday–Friday, 8 AM–5 PM)
- Email: Info@manchestercompliance.co.uk
- Address: 25 Holden Clough Drive, Ashton-under-Lyne, OL7 9TH