How many EREs does 1 kWh of grid electricity yield?

At the grid-average renewable share: approximately 0.3327 ERE per kWh. A charging session of 50 kWh then yields about 17 EREs (50 × 0.3327 = 16.6, rounded to whole EREs per registration).

And with 100% renewable electricity?

Then the full factor applies: 0.6588 ERE per kWh. The same 50 kWh session yields about 33 EREs — nearly double.

When may I calculate with 100% renewable?

Only if you demonstrably supply renewably generated electricity — for example via a direct line or generation at the same address — and can substantiate that with guarantees of origin or contracts. For regular grid supply the grid average applies.

Does the factor change per year?

The European fossil reference value (183 g/MJ) is fixed, but the grid-average renewable share is established annually. The factor for grid supply can therefore differ per registration year; always check the current value for the year of delivery.

How many EREs does EV charging yield? The calculation explained

The core question for every electricity registrant: how many EREs does my volume yield? The answer follows from a fixed NEa formula — but the difference between the two calculation variants is large enough to steer business cases.

The NEa formula

For electricity delivered to transport, the calculation reads:

EREs = delivered kWh × 3.6 × 183 × renewable share ÷ 1000

The components:

kWh — the quantity of electricity delivered, measured with an approved (MID-compliant) measuring instrument;
3.6 — the conversion from kWh to megajoules (1 kWh = 3.6 MJ);
183 — the European fossil reference value in grams of CO₂-equivalent per MJ, against which renewable electricity reduces;
renewable share — the grid average for grid supply, or 100% for demonstrably renewably supplied electricity;
1000 — the conversion from grams to kilograms (1 ERE = 1 kg CO₂-eq reduction).

The two practical variants

Grid supply (grid-average share). For electricity from the grid you calculate with the average renewable share of Dutch electricity production. Worked out, the factor comes to approximately:

0.3327 ERE per kWh

100% renewable. For supply via a direct line, or renewably generated electricity at the same address, the full emission reduction counts:

0.6588 ERE per kWh

That is nearly a factor of two difference on identical volume.

Worked example: two scenarios on 1 GWh

A CPO with 1 GWh (1,000,000 kWh) of registrable volume in a year:

Scenario	Factor	EREs
Grid supply	0.3327	± 332,700
100% renewable	0.6588	± 658,800

The same number of kilometres, but more than 326,000 EREs difference — at a going ERE price, a substantial amount. The investment in making supply demonstrably renewable (guarantees of origin, contract structure) often pays for itself quickly here.

The pitfall of small sessions: rounding

EREs are credited in whole units per registration — there is no half ERE. That has a practical consequence many parties overlook:

a session of 1 kWh via grid supply computes to 0.33 ERE → rounded to 0 EREs;
a session of 10 kWh computes to 3.3 ERE → 3 EREs;
but 1,000 sessions of 1 kWh bundled into one registration of 1,000 kWh → 333 EREs.

For home and small-business charging with many small sessions, a significant share of the proceeds is lost to rounding without bundling. Professional registration services therefore aggregate these sessions into larger registrations before applying the calculation — precisely to close this leak.

From EREs to euros

The number of EREs is only half the equation; the market price determines the rest. That price fluctuates with demand (obligations of fuel suppliers) and supply. Note that EREs are not indefinitely durable: at the year closure, non-saved EREs lapse, so the timing of sales matters.

Sources

The formula and reference values are taken from the NEa: Registering renewable energy for transport — calculating the number of EREs from a registration (consulted August 2026). Working with charging infrastructure? Check whether your charger models are MID-approved in our charge point register — without compliant metering there is nothing to register.