Yes, if you're riding a speed pedelec that reaches 45 km/h (about 28 mph), an NTA 8776-certified helmet is worth seeking out. This Dutch standard was created specifically for high-speed e-bike riding, with impact testing at higher velocities than standard bicycle helmet certifications like CPSC or EN 1078. The faster you go, the more energy is involved in a crash, and NTA 8776 helmets are built to absorb that extra impact.
Standard bike helmets are tested at lower impact energies, which makes sense for typical cycling speeds but may not offer enough protection at speed pedelec velocities. NTA 8776 doesn't replace your local mandatory certification—it's an additional standard that sits on top of it, so you'll still see CPSC or EN 1078 listed alongside it.
If your e-bike tops out at the standard 25 km/h (15.5 mph) assist level, a regular certified helmet is generally sufficient. NTA 8776 is really designed for the higher-speed class of e-bikes that are increasingly common in Europe and gaining traction elsewhere.