Intuitively, you've done well if you receive money back from your energy company, but this is a bit vague -- differences in the time of reading your meter, price fluctuations, changes of energy supplier and so on make it hard to know what exactly has happened. Still, it is not difficult to make a comparison if you kown where to look on your bill.

Your annual bill usually shows column that tracks your use over a given periode:

In this case, there is a difference between daytime and nighttime tarrif, but you can just add those to come to your total use of 1154+1187 kWh = 2341 kWh. The bill also mentions the period over which this has been used, namely 372 days. Now determine how much kWh you would have used in a normal year: 365 days/year * 2341 kWh / 372 days = 2296 kWh/year.

You can do the same for gas, and find 365 days/year * 318 m3 / 372 days = 312 m3/year.

Now apply the same calculation over last year's bill, even if it is only a part of the year and even if it was under a different supplier. These differences are taken out by this calculation. We give the example for electricity -- say that last year's use was 2665 kWh/year. Since you have "normalised" to a standard year of 365 days it can be compared easily with other years, even if they are if it is a leap year. If you think it is a bad idea to add more (fossile-fueled) power plants than you should aim to reduce your energy use from year to year. This also saves money, as energy is increasing in price every year.

The percentage that is saved in this example is 100% * (old-new)/old = 100% * (2665-2296)/2665 = 13.8% -- a very good score and a challenge to repeat next year! If the number is negative you are in the red: you have used more than last year. This means you are part of the reason why additional power plants are being built! Search this site and others for tips to save energy, as it really hits both your wallet and your environment!