Friends of Merrymeeting Bay will present the first talk in their 25th annual Winter Speaker Series on Wednesday, October 13, at 7 p.m. via Zoom. “Mega-Dams, Mega Problems!” will feature Roger Wheeler, president of Friends of Sebago Lake. The free talk will be accessible via a link at

According to a Friends news release, hydroelectric power, particularly involving the construction and operation of large or mega dams, does not produce green energy.

Building these dams uses large amounts of fossil fuel, creating greenhouse gases, and, once built, the large reservoirs or “blue deserts” continue discharging methane (and some CO2) for years as submerged vegetation decomposes. Blue deserts become relatively warmer bodies of water, affecting local climate through their moderating meteorological effects.

Wheeler helped Friends of Sebago Lake participate in regulatory actions that advocated restoration of historic natural lake and river flow regimes that better mimicked the seasonal cycle. FOSL’s research and documentation of pre-dam Sebago Lake anadromous fish populations led to a landmark victory for fish passage at the U.S. Supreme Court.

Free Winter Speaker Series talks are held the second Wednesday of each month, October through May. Due to the COVID-19 pandemic, the series continues via Zoom.

Visit to view speaker biographies, full event schedules and video recordings of past presentations and to become a member. Email for more information, or phone 666-3372.