You will still need to take your electric car for an MOT. However, when you lease a car with New Cars Online, you will be leasing a brand new car. So you will not need to take it for an MOT for the first 3 years. Whether you lease an electric car or a petrol or diesel car, you won't need to MOT the car during the first 3 years of the cars life. If you take out a contract that is 3 years or less, you will not need to MOT the car.
You will still need to service the car regularly, but you can expect the costs to be much lower. Because electric cars have significantly fewer moving parts than combustion engine cars, the cost of servicing and maintenance are often much lower.