There may be some other programs you can take advantage of to get part of the cost covered. If you use your pond as an irrigation source to grow an ag commodity, or if your pond is impacted by ag practices, you may qualify for funding through NRCS. Check the AWEP or EQIP programs through NRCS.
Actually, this program is not specific to renewable energy projects. It's mainly for water quality improvement projects which makes anyone who fits the criteria above eligable.
Check this link:
http://www.nrcs.usda.gov/programs/awep/index.html
