A few sites that have well-educated readers are nextbigfuture.com and phys.org. You could probably get an interview on nextbigfuture if you contact Brian Wang at blwang at gmail dot com
Phys.org has an idea submission form to have your research printed on their website. The form is here: http://phys.org/help/suggest/
You can also submit clean energy ideas at climatecolab.org. You would submit a proposal on their website and the proposals are then voted on. The finalists will be invited to a conference at MIT in November where they will be able to present their ideas to policymakers, business executives, investors, officials at non-profits and non-governmental organizations (NGOs) and citizen groups. – http://climatecolab.org/web/guest/about
IAmAs are a great way of generating publicity and past IAmAs have been done by notable scientists such as Dr. John Mather, Neil deGrasse Tyson, Bill Nye and the Curiosity Rover science team.
Information on how to do an IAmA can be found at: http://www.reddit.com/r/IAmA/wiki/index