Are the referral code and link points still valid for July promotion? Is there a restriction on amount of monthly consumption of electricity before the promotion applies?

You can Google for geneco promotions. I registered in end May and uses the latest promotion and it worked. If it doesn't; it would be flagged to you on the spot when you sign up.

Regarding the $x/month, I would recommend you to look into your SP bill first and establish your average usage. Use the /kw pricing for the plan you're planning to take up and estimate what would be your payment like upon signing up geneco. What they shows as $xx//mth are all just an estimation.. and it is just for demonstrations.