If you currently have a $1.00 bid for the content network as a whole in this ad group, you can now add the high- and low-performing sites as placements into your ad group with custom bids. For example, you might set a $2.00 Max CPC for the three high-performing sites, and a $0.50 Max CPC for the low-performing ones. Meanwhile, you're still using the keywords in your ad group to target relevant pages across the content network, but now you've adjusting bids for the sites in the network that perform better or worse than average.
Now you can create an ad group containing the same 'laptop' keywords you've been using and add each of the energy efficiency sites as placements. Next, change your campaign settings so that your ads show only on the sites you've added, and only when their pages are relevant to your keywords. This gives you the freedom to write an ad highlighting the energy-saving benefits of your laptops to this unique audience, since you know that your ad will appear only on relevant pages on the placements you've selected.