How do solar and EV charging affect your Scope 2 reporting?

Solar and charging affect your carbon report through electricity use and the reporting boundary you choose. Scope 2 covers purchased energy, according to GHG Protocol [S1]. Installing chargers alone does not prove an emissions reduction. Separate your site's electricity, driver consumption and renewable claims before comparing the income case. Checked October 2026.

Last checked 17 October 2026

What counts as Scope 2 emissions at a charging site?

Scope 2 covers emissions from producing purchased electricity, heat, steam and cooling. It describes an accounting category, rather than the equipment standing in your car park. GHG Protocol sets the energy accounting framework. [S1] Start with the emissions glossary.

For your project, draw a diagram showing the incoming supply, building, solar array, battery and chargers. Mark who buys electricity at each boundary. Ask your reporting adviser to confirm the treatment of electricity sold to visitors or purchased by another operator. A land lease does not, by itself, settle that classification.

Use the diagram to request the right exports from the installer. A monthly payment statement cannot replace energy records. Kilowatts (kW) measure power; kilowatt-hours (kWh) measure energy used over time. Keep both in your asset register, but use energy consumption in the emissions calculation. Government conversion factors support activity-based calculations using purchased electricity. [S3]

How should you report carbon reductions from solar and charging?

Keep the electricity calculation separate from the business case. UK reporting guidance describes location-based electricity accounting and a separate market-based approach for contractual purchases. [S2] Do not treat a charger installation photograph as evidence that either result has fallen.

Build a reconciliation rather than a headline percentage:

This is a suggested evidence pack, not a prescribed reporting form. Agree the format with whoever signs off your report. Include the unit, period and file owner so that the next reporting cycle can reproduce the result.

For a transparent calculation, use: purchased kWh × the applicable kg CO2e per kWh ÷ 1,000 = tonnes CO2e. CO2e means carbon dioxide equivalent. Select the factor from the relevant government workbook and record its category. [S3] This page does not quote a factor because selecting the category comes before using a number.

Why do renewable electricity claims need separate evidence?

Ask what your contract actually transfers. Ofgem describes renewable electricity certificates as evidence supporting fuel-mix disclosure, with additional uses in carbon accounting. [S4] A marketing description alone is insufficient evidence for the claim you want to put in a customer tender.

GHG Protocol applies quality criteria to contractual instruments used for market-based reporting. [S1] Ask your adviser to review the evidence before you publish the result. For owned solar, include any sale or transfer of renewable attributes in that review. Read about electricity supply contracts before linking a tariff change to your carbon reduction plan.

Keep avoided vehicle emissions outside the project income table. A comparison with petrol or diesel needs its own mileage, vehicle and energy assumptions. Do not count an unpriced carbon benefit as money available to repay installation costs.

Could the charging project earn income and repay its capital?

The following is an illustration, not a quote. All commercial inputs are assumptions, not market benchmarks. It isolates charging income; solar output, carbon value and additional shop sales are excluded.

Assume the funder bears every operating cost under fully funded. For part funded the host receives its gross share, then pays the same share of energy and overheads. Under self funded it pays them all. Effective energy cost includes losses; no separate loss adjustment is added. Amounts exclude VAT, tax, borrowing, rates, land opportunity cost and major replacement, which a site appraisal must add.

Annual energy = sessions × 20 × 365. Self funded annual net = energy × (£0.50 − £0.25) − £600. Part funded net = 60% × that net. Fully funded income = 10% × energy × £0.50.

Simple ROI = annual net ÷ host capital × 100. Payback = host capital ÷ annual net; it ignores timing and later replacement. Check with your accountant before using these figures for an investment decision.

What should you confirm before approving the project?

Request a survey covering spare power, cable routes, accessible parking, planning and retained customer bays. Ask who contacts the distribution network operator (DNO), the company responsible for the local electricity network, when connection changes are needed. Do not assume a carbon-reporting objective makes a location suitable.

Put data access into the specification: downloadable readings, reporting boundaries, correction procedures and access after a contract ends. Review land tenure, removal costs, liability and business rates with the relevant adviser. Compare the three-model business case using the same charging demand before signing away parking space.

What should you do next?

Gather your bills, reporting boundary and proposed charging demand. Read how we work, then get matched with an installer that covers your area. Piggy Pineapple Ltd operates this referral service. We refer enquiries to installer partners and may be paid a fee. Our owner holds shares in at least one partner. Before passing on your details, we name the proposed partner and disclose any shareholding our owner holds in it.