How is the number of EREs from charged kWh calculated?

One kWh of charging doesn’t produce a fixed number of EREs - the conversion depends on three fixed figures set out in the Energy for Transport Regulation. For 2026 that works out to 0.33269 ERE per kWh of grid electricity, or roughly 1 ERE per 3 kWh. This article walks through the official formula step by step, with a worked example in EREs and in euros.

The official formula in one line

The NEa converts registered charging data into EREs using a fixed, statutory formula:

Number of EREs = electricity delivered (kWh) × renewable share × 183 (g CO₂/MJ) × 3.6 (MJ/kWh) ÷ 1,000

That looks abstract, but each term stands for something concrete: how much electricity you supplied, how “green” the Dutch grid was on average, and how much CO₂ that electricity would have emitted according to the European reference value if it had come entirely from a fossil source. Here’s what each variable means.

What does each variable mean?

Variable	2026 value	Meaning
Electricity delivered	your charging data	The amount of grid electricity your charge point registers, measured by an integrated MID-certified meter and supplied verifiably.
Renewable share	0.505 (50.5%)	The national share of renewable electricity, set by Statistics Netherlands (CBS), from two years earlier - for 2026 that’s the figure for 2024.
CO₂ reference value	183 g CO₂/MJ	The European fossil reference value from the RED directive: the emissions level against which renewable energy in transport is compared.
Energy conversion factor	3.6 MJ/kWh	The fixed physical conversion from kilowatt-hours to megajoules.
Divisor	÷ 1,000	Converts grams of CO₂ into kilograms, since 1 ERE is legally equal to 1 kg of avoided CO₂.

Fill these in and you get: 0.505 × 183 × 3.6 ÷ 1,000 = 0.33269 ERE per kWh of grid electricity charged.

Why the national average, not your own electricity contract?

For ordinary grid electricity - charging without being able to prove the electricity comes directly from your own solar panels - nobody can physically point to which electrons came from a wind farm and which came from a gas-fired plant. A “100% green electricity” contract with your energy supplier doesn’t change that in the standard calculation: on the grid itself, electricity can’t be traced back to a single source. That’s why the Energy for Transport Regulation uses the national average share of renewable electricity, as set annually by CBS. For 2026 that’s the figure for 2024 (50.5%), because CBS figures only become final after a calendar year has ended, leaving a reliable, audited value to calculate with.

Worked example: from kWh to EREs

Two examples make the formula concrete.

A single 10 kWh charging session: 10 × 0.33269 = 3.33 EREs.

A full charging year of 4,000 kWh (a typical annual volume for someone charging a mid-sized EV at home): 4,000 × 0.33269 = 1,330.76 EREs per year.

Both calculations use exactly the same formula; only the number of kWh charged differs.

From EREs to euros

An ERE doesn’t have a fixed, government-set price. Its value forms through supply and demand between registration service providers (inboekdienstverleners) and fuel suppliers who need to meet a reduction obligation. In early September 2026 the market-wide indicative price stood at roughly €0.31 per ERE, with a band of €0.21 to €0.41 across public sources.

Running the annual example of 4,000 kWh (1,330.76 EREs) through that band gives the following gross picture, before a provider’s commission:

Scenario	Price per ERE	Gross per year at 4,000 kWh
Conservative	€0.21	≈ €279
Expected	€0.31	≈ €413
Optimistic	€0.41	≈ €546

Translated per kWh, the expected column works out to roughly €0.10 gross per kWh of grid electricity charged - a rule of thumb you’ll often see in calculators, since 0.33269 × €0.31 ≈ €0.1031 per kWh.

Why the conversion factor changes every year

2026’s 0.33269 isn’t a permanent number. The renewable share of the Dutch grid tends to rise year on year, so the CBS figure used - always from two years earlier - moves with it. As the grid gets greener, the number of EREs per kWh charged should in principle rise too, and with it the potential payment per kWh, independent of the market price per ERE itself. The 183 g/MJ CO₂ reference value and the 3.6 MJ/kWh conversion, by contrast, are fixed within this formula and aren’t subject to annual revision.

Doing the maths yourself: a few rules of thumb

• 1 ERE ≈ 3 kWh of grid electricity charged (more precisely: 3.01 kWh per ERE).
• 100 kWh charged ≈ 33.3 EREs.
• 1,000 kWh charged ≈ 333 EREs ≈ €103 at a price of €0.31 per ERE, before commission.
• If you charge partly on your own, demonstrably renewable electricity with its own generation meter (for example solar panels on a separate meter), different rules may apply instead of the national average; check with your registration service provider, since this article covers only the standard calculation for grid electricity.

Note: this is the gross calculation

This formula only determines how many EREs your charging sessions generate and what their gross value is at the current market price. What you actually get paid also depends on your provider’s commission and payout frequency, and on the fact that private individuals cannot register directly with the NEa - that always runs through a registered service provider. So compare not just the calculation, but also providers’ terms side by side before signing up.