Issue with Hydro Pumped Storage values

Hi,

The entsoe pandas client (probably also the Raw client but I didn’t tested it), does not take into consideration the “negative values” of the Hydro Pumped Storage. This production is able to pump water and so have a negative production (it’s a charge not a generator).

The ENTSOE API website does the difference

But the Python client does not :

I don’t know how to do the difference too in the raw XML

	<TimeSeries>
		<mRID>5</mRID>
		<businessType>A01</businessType>
		<objectAggregation>A08</objectAggregation>
		<inBiddingZone_Domain.mRID codingScheme="A01">10YFR-RTE------C</inBiddingZone_Domain.mRID>
		<quantity_Measure_Unit.name>MAW</quantity_Measure_Unit.name>
		<curveType>A01</curveType>
		<MktPSRType>
			<psrType>B10</psrType>
		</MktPSRType>
		<Period>
			<timeInterval>
				<start>2019-05-20T05:00Z</start>
				<end>2019-05-20T06:00Z</end>
			</timeInterval>
			<resolution>PT60M</resolution>
				<Point>
					<position>1</position>
                        <quantity>1902</quantity>
				</Point>
		</Period>
	</TimeSeries>
	<TimeSeries>
		<mRID>6</mRID>
		<businessType>A01</businessType>
		<objectAggregation>A08</objectAggregation>
		<outBiddingZone_Domain.mRID codingScheme="A01">10YFR-RTE------C</outBiddingZone_Domain.mRID>
		<quantity_Measure_Unit.name>MAW</quantity_Measure_Unit.name>
		<curveType>A01</curveType>
		<MktPSRType>
			<psrType>B10</psrType>
		</MktPSRType>
		<Period>
			<timeInterval>
				<start>2019-05-20T03:00Z</start>
				<end>2019-05-20T05:00Z</end>
			</timeInterval>
			<resolution>PT60M</resolution>
				<Point>
					<position>1</position>
                        <quantity>1236</quantity>
				</Point>
				<Point>
					<position>2</position>
                        <quantity>308</quantity>
				</Point>
		</Period>
	</TimeSeries>

The first TimeSeries should be considerated as positive and the second as negative.

I have send an email to ENTSO-E platform for more information.

[fgenoese]

1st column should be gross generation (“Actual Aggregated”), 2nd column should be the electricity used to operate the power plants (“Actual Consumption”). Not every country has live gross generation, and therefore directly publishes net generation (1st minus 2nd column).

According to ENTSO-E documentation, "Net Generation is preferred however gross generation could be used where it is available with the better precision. TSOs should decide gross or net generation will be used but the net/gross characteristic should be consistent per Bidding zone. "

Your solution leaves it to the user whether gross or net generation should be retrieved (when available). Vote to merge this pull request.

[JrtPec]

Solution deployed in 0.3.2