Electricity use tends to go up in the summer, and power surges and lightning strikes can also be expected. Check out your system now to avoid problems, and learn best practices in conserving energy use.
Trip and reset the circuit breakers. Make sure that the lightbulbs in all of your lamps and fixtures don't exceed the recommended wattage, and consider putting CFLs in the lamps and fixtures you use the most. Check all electrical outlets for loose-fitting plugs, and make sure that all outlets and switches are functioning properly. Call a licensed electrician to troubleshoot and repair any problems. If there are young children in the house, install safety covers on unused outlets. Make sure you have a fully charged multipurpose fire extinguisher handy, in case of an electrical fire. While you're at it, do a test of all smoke and CO2 detectors to make sure they're functioning properly. Replace batteries as needed.
If you live in an area that experiences frequent power outages and/or lightning strikes, you may want to look into getting surge and lightning protection systems for your home.