I had this happen to one of my client's once. The easiest fix is to just install a new NIC . This is one that I use that has always worked the best for me.
But to answer your question, its not 100% certain that your Network Interface Card (NIC) is fried. It is a possibility that your router, or switch (whichever you have) might be malfunctioning now because of the storm. If you can, plug another computer or device into the router or switch. IF you get a connection on the second device, you know that the router, or switch, is working properly. (process of elimination)
And also before you go out and buy a new NIC, try changing the port that the Network cable is plugged into on the router, or switch, to verify that the port is not the problem. Also try changing the cable with another cat 5e or cat6 cable (which ever you have) as it is a possibly that the cable has become bad.
Comment back with questions if you have any.
Cert. Net Engineer
A+, NOCTI, NET+