for instance there could be agreement that renewables constitute epps based on the source of energy ie the resource rather than on the use of the products as their categorization is not so much based on the specific category of technologies eg electricitygenerating motors power converters or inverters as it is on the source of the power eg biofuels lowhead hydro solar wind or geothermal other goods using a particular source of energy could be classified as a single source within a category eg electric cars or trains which fall under hs or hs however the majority of these goods owe their environmental performance to a combination of features and can only be definitively identified through testing