June 10 (Reuters) - A consortium including U.S. investment firms KKR KKR.N and Energy Capital Partners is in detailed talks to acquire Ireland's DCC DCC.L, valuing the energy distributor at over £5 billion ($6.69 billion), Sky News reported on Wednesday.

DCC in late April rejected the consortium's £58-per-share or £4.95-billion proposal, saying it undervalued the company.

Here are more details:

• Sky News said the revised offer values DCC at around £65 per share, representing a 12% increase from the earlier rejected bid.

• Shares of the London-listed company were up 2.8% at £61.75. The stock has gained about 11.5% since the April offer, based on Tuesday's close.

• The consortium faces a 5.00 pm GMT deadline on Wednesday to make a firm offer or abandon its pursuit for six months under UK takeover rules.

• A spokesperson from DCC declined to comment on the report. KKR and Energy Capital Partners did not immediately respond to a Reuters request for comment.

($1 = 0.7475 pounds)