This has no clear impact on how much energy would be used. Tenants would still have an incentive to save on energy. Whether they get to pay less rent doesn’t influence how much energy they use.

This suggests people might be aware of how much they can save on energy. If anything, this strengthens the author’s argument by giving another reason to think tenants will start to save on energy use if tenants were responsible for their own electricity bills.

This raises the possibility that by switching to individual meters, landlords won’t be as likely to ensure their appliances are energy-efficient. Thus, even if tenants use the appliances less often, the appliances themselves might use more energy.

This suggests that landlords won’t be able to switch to individual meters in some buildings. The author never said this was possible everywhere. The conclusion is simply about what would result if landlords were able to make this switch.

This suggests some people might save energy for other reasons. But this doesn’t mean that cost can’t also be a motivating factor for those people. The individual meter can still incentivize them to save on energy. And, the author never assumed every tenant will conserve energy.