California has yet to see the full force of El Nino, and it's already tripping up the state's power-demand forecasters. The state saw "significant" electricity price spikes in the third quarter as El Nino made it difficult to predict how much power would be needed on hot summer and fall days, the California Independent System Operator Corp. said Monday in a "With El Nino, California and the Southwest tends to get more storminess and that is inherently more challenging to forecast," Matt Rogers, president of Commodity Weather Group LLC, said in an e-mail Tuesday.