want to know who is this

Cursed me and hung up when I asked if they were with my credit card company.

Yet another credit card scam.

Here is North American Power and Gas, LLC website and some contact info. In case you want to let them know your displeasure.
http://www.napower.com/

Customer Service:
Telephone: Toll free at 888.313.9086 or locally at 203.893.4196
Email: customercare@napower.com

Representative Support:
Telephone: 888.313.9086 (option 3) or locally at 203.663.9799
Email: support@napower.com

Advertising & Sponsorship Inquiries:
For sponsorship and advertising inquiries, please contact:
L. Alexander
lalexander@napower.com

Press Inquiries:
Carrie Waible or Sarah Gentsch
Telephone: 212.379.4024
Email: napower@cwandco.com

Corporate Headquarters:
Twenty Glover Avenue
Norwalk, CT 06851
Telephone: 203.939.1155

Careers:
Telephone: 203.939.1155
Email: careers@napower.com

Here is North American Power and Gas, LLC website and some contact info. In case you want to let them know your displeasure.

http://www.napower.com/

Customer Service:
Telephone: Toll free at 888.313.9086 or locally at 203.893.4196
Email: customercare@napower.com

Representative Support:
Telephone: 888.313.9086 (option 3) or locally at 203.663.9799
Email: support@napower.com

Advertising & Sponsorship Inquiries:
For sponsorship and advertising inquiries, please contact:
L. Alexander
lalexander@napower.com

Press Inquiries:
Carrie Waible or Sarah Gentsch
Telephone: 212.379.4024
Email: napower@cwandco.com

Corporate Headquarters:
Twenty Glover Avenue
Norwalk, CT 06851
Telephone: 203.939.1155

Careers:
Telephone: 203.939.1155
Email: careers@napower.com

Seems as though you can't get away from these calls.  Within a two month span I received 108 calls.  After sending complaints to the FCC and FTC without any assistance I contacted the Attorney General in NJ.  The calls stopped for a month and a half and am now receiving them again.  They are also sending mail now, hope it helps the Post Office out of debt .. company name is North American Power.

Identical to the call I registered here on March 12.  Reported them again.

Latest in a long line of robocalls on the same subject.  Recorded female voice calling "pertaining to your current electric bill.  Due to recent state deregulation you are eligible to receive a discount on your electric bill.  Press 5 to be transferred to find out which discount you are eligible for.  Press 5 to be transferred to one of our friendly representatives."  Caller ID read only 2012433360.  Reported these violations (recorded call; calling a number on the DNC list) to the feds at https://complaints.donotcall.gov/complaint/complaintcheck.aspx

Got a call from this number yesterday.  Did not answer and they left no message. Figured it was a "scam" call (getting 3 to 4 per day). ID said "out of area"

I've gotten tired of telling these idiots that I am not interested.  Now when they say they are required to hold while I get my bill, I let them do just that.  I put the phone on mute and go about my day.  One actually held for over 10 minutes.  I am on the Do Not Call List for a reason.  If they want to waste my time, I like to return the favor.

Call came in with no name.  Left no message.  We are on the do-not-call list.  We have also been plagued by NJ's insane decision to let power companies hound the public for their business.

I am on the Federal Do Not Call list but they call anyway. Robo call announcing I "...am eligible to save money on my electric bill, press 5 to speak to a representative..."

Your electric account number is gold to them, don't give them your account number. With your account number they can change your energy supplier. Put them on HOLD while you pretend to get your most recent energy bill to prevent them from calling and bothering someone else. Be polite to them but make them wait, waste their time.

called back and pressed "1" to be placed on the do-not-call list. Let's see i it works.

Did not answer never will, no message left.

Latest in a long line of robocalls on the same subject.  Recorded female voice calling "pertaining to your current electric bill.  Due to recent state deregulation you are eligible to receive a discount on your electric bill.  Press 5 to be transferred to find out which discount you are eligible for.  Press 5 to be transferred to one of our friendly representatives."  Caller ID read only 2012433360.  Reported these violations (recorded call; calling a number on the DNC list) to the feds at https://complaints.donotcall.gov/complaint/complaintcheck.aspx

answered, recorded message said they were a power company and if I wanted lower electric rates to hit five and grab my electric bill. I hit five and told "Chris", female, that my bill was unavailable due to myself preparing my income tax, however I asked her for their name and a return phone number. She hung up. Call back is dead line.

Just got call on land line. Did not answer. If it was important they should have left message.  ID said: Bayone, NJ

Caller ID said "Client Services", however they left no message and there is nothing on Google for this number.  Hmmm  smells fishy.

This is a northern New Jersey number.  Caller ID said "Client Services".