WASHINGTON, June 29 (TNSFR) -- The Federal Energy Regulatory Commission published a series of combined notices of filings signaling a period of robust regulatory activity across the U.S. energy sector. Recent notices detail a wide array of filings, including electric rate changes, natural gas pipeline agreements, tariff amendments, compliance filings and joint applications for mergers or acquisitions. Among the highlights, FERC received multiple electric rate filings from major utilities such a more PR