To simply say that your research will look at ways to deal with power grid instabilities indicates to the reader that you're working on solving a problem, but not why that problem is significant enough to work on. To indicate the significance of the problem, it would be necessary to briefly explain:
This is a unique website which will require a more modern browser to work! Please upgrade today!
Attributes of a good thesis : It should be contestable, proposing an arguable point with which people could reasonably disagree.
For more background on the ETD initiative, see this letter to students and the definition of an ETD.
After the topic sentence, the rest of the paragraph should go on to support this one proof with examples and explanation. It is the details that support the topic sentences in the body paragraphs that make the arguments strong.