ENERGY STAR certified EVSE
ENERGY STAR certification for EV chargers (EVSE) verifies low energy waste when the charger is idle. Certified units must meet watt-level caps in three measured idle states, and the EPA publishes every certified model’s tested standby draw in a public dataset.
Chargers spend over 80% of their life not charging, so standby draw matters more than it sounds. Certification testing measures no-vehicle, partial-on, and idle modes against strict allowances.
Some utility rebate programs require ENERGY STAR certification, and this site’s entire charger catalog is built from the official certified list.
| Modes measured | No Vehicle (J1772 State A), Partial On (State B), Idle (State C) |
|---|---|
| Base power allowance | 4 W, before any feature adders |
| Connectivity adders | About +1 W for Wi-Fi or Ethernet, +2 W for cellular, per output |
| Other adders | RFID reader 1.5 W · occupancy sensing 1.5 W · card reader 5 W · display by screen area and luminance |
| Idle Mode extra allowance | 0.4 W per amp of rated output — holding a big contactor closed costs real power |
| Current criteria effective | June 20, 2023 |
| EPA claim | Certified chargers use about 40% less energy in standby than conventional units |
What the certification actually tests
The three measured states map onto the J1772 pilot states, which is a more meaningful choice than it looks. No Vehicle Mode is State A — nothing plugged in, the charger just sitting on the wall generating its pilot signal. Partial On Mode is State B — a car is plugged in but not charging, which is the state a scheduled charger sits in for most of the night. Idle Mode is State C — the car is connected and charging is authorised, but no current is flowing.
Allowances are built from a 4 W base plus feature adders, and the adders are where the specification gets interesting. Wi-Fi or Ethernet with wake capability adds about a watt, cellular about two, an RFID reader 1.5 W, occupancy sensing 1.5 W and a credit-card reader 5 W. Displays get a formula based on screen area and measured luminance. Idle Mode gets a further allowance of 0.4 W per amp of rated output current, which is honest engineering: an 80 A contactor takes far more coil power to hold closed than a 32 A relay.
The consequence is that “ENERGY STAR certified” is not a ranking. A heavily featured 80 A networked pedestal with a display is allowed to draw considerably more than a bare 32 A wall box, and both can carry the label. What certification guarantees is that a unit is efficient relative to what it does. To compare two candidates you have to read their measured figures, not their badges — which is what the published dataset is for.
Why it matters more for the rebate than for your bill
The direct saving is small. Across the roughly 390 certified AC models currently listed, measured no-vehicle draw runs from effectively zero to about 15 W, with a median near 3.5 W. At the US average of about $0.17/kWh, 3.5 W costs roughly $5 a year and the worst certified unit costs about $22. The whole spread across the certified market is under $20 a year, which is real but not decisive.
The indirect value is much larger. A great many utility rebate and demand-response programs — commonly worth $250–$500 — require an ENERGY STAR certified charger, and some state and municipal incentives do too. That is a hundredfold the annual energy saving, and it is the practical reason to filter for certification before shortlisting anything.
The third value is the data itself, and it is why this site is built on the list. Manufacturers do not publish idle draw, and marketing copy about “efficient standby” is unfalsifiable without a number. Certification produces measured, comparable figures for standby power, output current, connector type and cord length across hundreds of models, tested the same way. That is the only apples-to-apples spec source that exists for home chargers.
What certification does not tell you
It is an energy label, not a quality label, and the gaps matter. It says nothing about the enclosure rating — there is no NEMA 3R, 4 or 4X field in the dataset — so it cannot tell you whether a charger belongs outdoors. It says nothing about the cable’s cold-temperature rating, which is the spec that decides whether the cord is flexible or a frozen garden hose at −20 °C. It says nothing about reliability, warranty length, app quality, customer support, or price.
Nor is it a safety mark. Electrical safety comes from listing to UL 2594 (electric vehicle supply equipment) and UL 2231 (personnel protection), by a nationally recognised testing laboratory. A charger can be perfectly safe and simply never have been submitted for ENERGY STAR, and an uncertified charger from a reputable brand is not a hazard — it is just an unmeasured unknown on standby.
Finally, the list contains a lot that is not a home product: commercial pedestals, dual-port fleet units, and white-label rebrands where three brand names sit on one piece of hardware. Use certification as your eligibility filter and your spec source, then verify enclosure rating and cable temperature range on the manufacturer’s own documentation before you buy.
Frequently asked questions
What does ENERGY STAR certification mean for an EV charger?
It means the unit was tested in three idle states — no vehicle connected, vehicle connected but not charging, and connected and idle — and met watt-level caps built from a 4 W base plus allowances for connectivity, displays, readers and contactor size. It is a measure of energy wasted when not charging; it says nothing about charging speed, durability or safety.
Does an ENERGY STAR EV charger save money?
Directly, only a few dollars a year — the median certified unit idles around 3.5 W, roughly 31 kWh or $5 annually at $0.17/kWh, versus perhaps double that for an unmeasured conventional unit. The real money is indirect: many utility rebates worth $250–$500 require a certified charger, so certification is usually the gate to the incentive rather than a saving in itself.
Do utility rebates require an ENERGY STAR charger?
Frequently, yes — and many also require the charger to be networked and enrolled in the utility’s demand-response program. Requirements vary by utility, so check the specific program before buying. The rebate typically dwarfs the price difference between a certified networked unit and a basic one.
Is a non-certified EV charger unsafe?
Not inherently. Safety comes from listing to UL 2594 and UL 2231 by a recognised testing laboratory, which is a separate and more important mark to look for. ENERGY STAR only addresses idle energy use. What an uncertified charger lacks is a measured, comparable standby figure — and, often, eligibility for your utility’s rebate.